Jacques Richard - Profile on Academia.edu (original) (raw)

Papers by Jacques Richard

2012 ASEE Annual Conference & Exposition Proceedings

His research is focused on computational plasma modeling using spectral and lattice Boltzmann met... more His research is focused on computational plasma modeling using spectral and lattice Boltzmann methods such as in plasma turbulence () and plasma jets ( His research has also included fluid physics using Lattice-Boltzmann (); electric propulsion ( Ion3.pdf); spectral element, etc. (see Weighted Essentially Non-Oscillatory (˜bijcr/WENO4web/WENOppframe.htm), etc. Past research includes modeling single and multi-species plasma flows through ion thruster optics and the discharge cathode assembly; computer simulations of blood flow interacting with blood vessels; modeling ocean-air interaction; reacting flow systems; modeling jet engine turbomachinery going unstable at NASA for 6 years (received NASA Performance Cash awards). Dr. Richard is involved in many outreach activities: e.g., tutoring, mentoring, directing related grants (for example, a grant for an NSF REU site, see ). Dr, Richard is active in professional societies (American Physical Society (APS), American Institute for Aeronautics and Astronautics (AIAA), etc.). Dr. Richard has authored or co-authored about 22 technical articles (17 of which are refereed publications). For more info see .

Journal of Heat Transfer, 2020

In this work, we propose an experimental setup to measure the thermal conductivity and specific h... more In this work, we propose an experimental setup to measure the thermal conductivity and specific heat of a single suspended glass fiber, as well as the thermal contact resistance between two glass fibers. By using optical lithography, wet and dry etching and thin film deposition, we prepared suspended glass fibers that are coated by niobium nitride (NbN) thin film used as room temperature thermal transducer. By using the 3ω technique, the thermal conductivity of glass fiber was measured to be 1.1 W m−1 K–1 and specific heat 0.79 J g−1 K–1 around 300 K under vacuum conditions. By introducing exchange gas into the measurement chamber, influence of the gas on the heat transfer was studied, and the convection coefficient h for all the measurement ranges from a pressure of 0.01 hPa to 1000 hPa, over more than five orders of magnitude, has been obtained. By adding a bridging glass fiber on top of two other suspended glass fibers, it was possible to estimate the thermal contact resistance b...

The International Journal of the First Year in Higher Education, 2015

Despite being well ahead of many other disciplines in establishing strong and evidence-based rese... more Despite being well ahead of many other disciplines in establishing strong and evidence-based research and practice, engineering in many countries still experiences high rates of student and graduate attrition. One possible reason for this is that students enter engineering study without understanding the realities of either their degree program or engineering work, and without a sense of motivation and commitment. The research reported here aimed to extend understanding of first year engineering students' thinking about their competencies, identity, self-efficacy, motivation, and career. The study involved over 1,100 first year engineering students enrolled in a common first year unit. Responses were coded using the Engineers Australia graduate competencies as a framework, and this paper reports findings from the most diverse cohort of students (n=260), of whom 49% were international students with English as their second language. The research identified differences between international and domestic students' perceptions of self and of career competencies, possibly related to selfesteem. Implications include improved confidence and motivation to learn as students consider their strengths, interests and goals. Further, the research raises the need for analysis of international students' cultural and educational background to determine how different cohorts of international students self-appraise and how they associate learning with their future careers.

Review of Scientific Instruments, 2015

We present a nanocalorimeter designed for the measurement of the dynamic heat capacity of thin fi... more We present a nanocalorimeter designed for the measurement of the dynamic heat capacity of thin films. The microfabricated sensor, the thermal conditioning of the sensor, as well as the highly stable and low noise electronic chain allow measurements of the real and imaginary parts of the complex specific heat with a resolution Δ C/C of about 10−5. The performances of this quasi-differential nanocalorimeter were tested on a model of polymeric glass-former, the polyvinyl acetate (PVAc). The high stability and low noise of the device are essential for accurate studies on non-equilibrium slow relaxing systems such as glasses.

2017 ASEE Annual Conference & Exposition Proceedings

She received her Ph.D. and M.S.Ed.in Educational Psychology with the specialties in Gifted Educat... more She received her Ph.D. and M.S.Ed.in Educational Psychology with the specialties in Gifted Education and Research Methods & Measurement, respectively from Purdue University. Her work centers on P-16 engineering education research, as a psychometrician, program evaluator, and institutional data analyst. She has authored/co-authored more than 30 journal articles and conference proceedings and served as a reviewer of journals in engineering education, STEM education, and educational psychology, as well as an external evaluator and an advisory board member on several NSF-funded projects.

2018 ASEE Annual Conference & Exposition Proceedings

Delivering significant results in pivotal roles such as Sr. Consultant to high-profile clients, S... more Delivering significant results in pivotal roles such as Sr. Consultant to high-profile clients, Sr. Project Manager directing teams, and Executive Leader of initiatives and programs that boost organizational effectiveness and optimize operations have been hallmarks of Dr. Wickliff's career spanning more than 24 years with leaders in the oil & gas and semiconductor industries. As an expert in the areas of Executive Leadership and Team Development, Strategy Design & Execution, Supply Chain Optimization, Change Management, System Integration and LEAN Process Improvement (technical and business), Dr. Wickliff is passionate about Organizational Wellness and the Holistic Wellness of individuals. She is also a professional Facilitator and Motivational Speaker. Dr. Wickliff earned a PhD in Interdisciplinary Engineering from Texas A&M University where she combined Industrial Engineering and Organizational Development to conduct research in the area of talent management and organizational effectiveness. She also completed an executive MBA from the University of Texas-Dallas and a BS in mechanical engineering from the University of Houston. She is founder of a nationally recognized pre-college initiative program, FreshStart, which has served more than 2000 students since its inception. Dr. Wickliff is blessed to work daily in the area of her passion-developing young professionals-in her role at Texas A&M University. She is a Professor of Engineering Practice. At Texas A&M University, she has taught Capstone Senior Design, Statics & Dynamics, Engineering Ethics, Engineering Leadership and Foundations of Engineering courses. She has also taught Project Management and Risk Management courses for the University of Phoenix.

2019 ASEE Annual Conference & Exposition Proceedings

Station (TEES). She received a Ph.D. in Educational Psychology with specialties in Gifted Educati... more Station (TEES). She received a Ph.D. in Educational Psychology with specialties in Gifted Education and a M.S.Ed. in Educational Psychology with specialties in Research Methods and Measurement both from Purdue University. She also holds a M.S. in Astronomy and Astrophysics and a B.S. in Astronomy and Meteorology both from Kyungpook National University in South Korea. Her work centers on engineering education research, as a psychometrician, program evaluator, and institutional data analyst. She has research interests on spatial ability, creativity, gifted education, STEM education, and meta-analyses. She has authored/co-authored more than 50 peer-reviewed journal articles and conference proceedings and served as a journal reviewer in engineering education, STEM education, and educational psychology, as well as a co-PI, an external evaluator or advisory board member on several NSF-funded projects (CA-REER, iCorps, REU, RIEF, etc.).

An approach to simulating the internal flows of supersonic propulsion systems is presented. The a... more An approach to simulating the internal flows of supersonic propulsion systems is presented. The approach is based on a fairly simple modification of the Large Perturbation Inlet (LAPIN) computer code. LAPIN uses a quasi-one dimensional, inviscid, unsteady formulation of the continuity, momentum, and energy equations. The equations are solved using a shock capturing, finite difference algorithm. The original code, developed for simulating supersonic inlets, includes engineering models of unstart/restart, bleed, bypass, and variable duct geometry, by means of source terms in the equations. The source terms also provide a mechanism for incorporating, with the inlet, propulsion system components such as compressor stages, combustors, and turbine stages. This requires each component to be distributed axially over a number of grid points. Because of the distributed nature of such components, this representation should be more accurate than a lumped parameter model. Components can be model...

Elsasser variables Jacques Richard & Sharath S. Girimaji Aerospace Engineering, Texas A&M Univers... more Elsasser variables Jacques Richard & Sharath S. Girimaji Aerospace Engineering, Texas A&M University, College Station, TX 77843, USA We examine the influence of a mean magnetic field on the decay of initially isotropic magneto-hydrodynamic (MHD) turbulence. Direct numerical simulations (DNS) MHD turbulence is performed using the magneto-hydrodynamic Lattice Boltzmann Method (MHD-LBM). The initial turbulence is isotropic and a uniform magnetic field is introduced. There are no fluctuations in the initial magnetic field. As the velocity and magnetic fields evolve, there is energy interchange between velocity and magnetic field as they approach equipartition (Figure 1). This approach is not monotonic and involves large excursions brought about by Alfven waves propagating through the flow system (Davidson, 2001). We analyze the velocity and magnetic field decay using Elsasser variables (Biskamp, 2003, Yoshizawa et al., 2003). Magnetic and kinetic energy spectra, magnetic and kinetic ani...

2014 ASEE Annual Conference & Exposition Proceedings

His research is focused on computational plasma modeling using spectral and lattice Boltzmann met... more His research is focused on computational plasma modeling using spectral and lattice Boltzmann methods for studying plasma turbulence and plasma jets. His research has also included fluid physics and electric propulsion using Lattice-Boltzmann methods, spectral element methods, Weighted Essentially Non-Oscillatory (WENO), etc. Past research includes modeling single and multi-species plasma flows through ion thruster optics and the discharge cathode assembly; computer simulations of blood flow interacting with blood vessels; modeling ocean-air interaction; reacting flow systems; modeling jet engine turbomachinery going unstable at NASA for 6 years (received NASA Performance Cash awards). Dr. Richard is involved in many outreach activities: e.g., tutoring, mentoring, directing related grants (for example, a grant for an NSF REU site). Dr, Richard is active in professional societies (American Physical Society (APS), American Institute for Aeronautics and Astronautics (AIAA), etc.), ASEE, ASME. Dr. Richard has authored or co-authored about 25 technical articles (19 of which are refereed publications). Dr. Richard teaches courses ranging from first-year introductory engineering design, fluid mechanics, to space plasma propulsion.

Board 132: Impact of a Research Experience Program in Aerospace Engineering on Undergraduate Students: Year Two

2019 ASEE Annual Conference & Exposition Proceedings

Lessons Learned by the Aerospace Engineering Department at Texas A University Following Its First Summer Camp for High School Students

2013 ASEE Annual Conference & Exposition Proceedings

Analysis of Laser-Generated Impulse In An Airbreathing Pulsed Detonation Engine: Part 1

AIP Conference Proceedings, 2005

An investigation is performed on an airbreathing laser propulsion (LP) system designed to propel ... more An investigation is performed on an airbreathing laser propulsion (LP) system designed to propel a 1.4 m diameter, 120-kg (dry mass) vehicle called the Lightcraft Technology Demonstrator (LTD) into low Earth orbit, along with its opto-electronics payload. The LTD concept led directly to the model No.200 lightcraft - recently demonstrated in laboratory and flight experiments at White Sands Missile Range,

MHD-LBM Simulations of Magnetic Field Effects on Axis-Switching and Instabilities in Rectangular Jets

Our objective is to assess the potential for flow control of plasma jets for space propulsion and... more Our objective is to assess the potential for flow control of plasma jets for space propulsion and high-altitude external flow applications. Toward this end, we study the effect of an externally applied magnetic field on rectangular plasma jets using a Magneto-hydrodynamic (MHD) Lattice ...

Low-order nonlinear dynamic model of IC engine-variable pitch propeller system for general aviation aircraft

ABSTRACT This paper presents a dynamic model of an internal combustion engine coupled to a variab... more ABSTRACT This paper presents a dynamic model of an internal combustion engine coupled to a variable pitch propeller. The low-order, nonlinear time-dependent model is useful for simulating the propulsion system of general aviation single-engine light aircraft. This model is suitable for investigating engine diagnostics and monitoring and for control design and development. Furthermore, the model may be extended to provide a tool for the study of engine emissions, fuel economy, component effects, alternative fuels, alternative engine cycles, flight simulators, sensors, and actuators. Results show that the model provides a reasonable representation of the propulsion system dynamics from zero to 10 Hertz.

Ion thrusters are the most efficient EP devices at converting input power to thrust and are used ... more Ion thrusters are the most efficient EP devices at converting input power to thrust and are used both as primary propulsion and for station-keeping on commercial and scientific spacecraft. Key issues include grid erosion and thrust density limitations from space-charge effects.

Acceleration of a Plasma Flow by Oscillating Magnetic Mirrors

44th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 2008

Implementation of a Spectral Decomposition of the Boltzmann Equation with the Streaming in the Lattice-Boltzmann Method

ABSTRACT Recent developments in mathematics have allowed for the collision process of the Boltzma... more ABSTRACT Recent developments in mathematics have allowed for the collision process of the Boltzmann equation to be discretized using spectral methods. This new method has the potential for replacing the Bhatnagar-Gross-Krook (BGK) approximation used in approaches such as the lattice-Boltzmann method (LBM). This would end the need for a low Mach approximation to the linearized Boltzmann equation in LBM. This allows solving the full Boltzmann equation and should therefore avoid many of the limitations of current approxima- tions. This paper shows a derivation for the spectral method as well as an implementation for a 2-D and 3-D test cases with results. A simulation of decaying isotropic turbulence is also presented.

Energy exchange in magnetohydrodynamic decaying isotropic turbulence

Proceedings of the Sixth International Symposium On Turbulence, Heat and Mass Transfer, 2009

Assessment of Magnetohydrodynamic Lattice Boltzmann Schemes in Turbulence and Rectangular Jets

International Journal of Modern Physics C, 2008

Two lattice Boltzmann method (LBM) formulations are possible to account for the effect of the mag... more Two lattice Boltzmann method (LBM) formulations are possible to account for the effect of the magnetic field on the velocity field in magnetohydrodynamic (MHD) flows. In the body-force formulation (BFF), the magnetic field effects manifest as an external acceleration. In the extended equilibrium formulation (EEF), the effect appears through a modified equilibrium distribution function. Further, for the velocity field itself, the available choices are the single-relaxation time (SRT) and multi-relaxation time (MRT) models. Thus, for MHD-LBM, there are four possible permutations: SRT-BFF, SRT-EEF, MRT-BFF and MRT-EEF. Numerical implementation of the first three have already been presented in the literature. In this work, we, (i) develop the numerical implementation of MRT-EEF and (ii) perform an assessment of the four possible approaches. Our results indicate that the MRT-EEF is the most robust and accurate of the MHD-LBM computational schemes examined.

2012 ASEE Annual Conference & Exposition Proceedings

His research is focused on computational plasma modeling using spectral and lattice Boltzmann met... more His research is focused on computational plasma modeling using spectral and lattice Boltzmann methods such as in plasma turbulence () and plasma jets ( His research has also included fluid physics using Lattice-Boltzmann (); electric propulsion ( Ion3.pdf); spectral element, etc. (see Weighted Essentially Non-Oscillatory (˜bijcr/WENO4web/WENOppframe.htm), etc. Past research includes modeling single and multi-species plasma flows through ion thruster optics and the discharge cathode assembly; computer simulations of blood flow interacting with blood vessels; modeling ocean-air interaction; reacting flow systems; modeling jet engine turbomachinery going unstable at NASA for 6 years (received NASA Performance Cash awards). Dr. Richard is involved in many outreach activities: e.g., tutoring, mentoring, directing related grants (for example, a grant for an NSF REU site, see ). Dr, Richard is active in professional societies (American Physical Society (APS), American Institute for Aeronautics and Astronautics (AIAA), etc.). Dr. Richard has authored or co-authored about 22 technical articles (17 of which are refereed publications). For more info see .

Journal of Heat Transfer, 2020

In this work, we propose an experimental setup to measure the thermal conductivity and specific h... more In this work, we propose an experimental setup to measure the thermal conductivity and specific heat of a single suspended glass fiber, as well as the thermal contact resistance between two glass fibers. By using optical lithography, wet and dry etching and thin film deposition, we prepared suspended glass fibers that are coated by niobium nitride (NbN) thin film used as room temperature thermal transducer. By using the 3ω technique, the thermal conductivity of glass fiber was measured to be 1.1 W m−1 K–1 and specific heat 0.79 J g−1 K–1 around 300 K under vacuum conditions. By introducing exchange gas into the measurement chamber, influence of the gas on the heat transfer was studied, and the convection coefficient h for all the measurement ranges from a pressure of 0.01 hPa to 1000 hPa, over more than five orders of magnitude, has been obtained. By adding a bridging glass fiber on top of two other suspended glass fibers, it was possible to estimate the thermal contact resistance b...

The International Journal of the First Year in Higher Education, 2015

Despite being well ahead of many other disciplines in establishing strong and evidence-based rese... more Despite being well ahead of many other disciplines in establishing strong and evidence-based research and practice, engineering in many countries still experiences high rates of student and graduate attrition. One possible reason for this is that students enter engineering study without understanding the realities of either their degree program or engineering work, and without a sense of motivation and commitment. The research reported here aimed to extend understanding of first year engineering students' thinking about their competencies, identity, self-efficacy, motivation, and career. The study involved over 1,100 first year engineering students enrolled in a common first year unit. Responses were coded using the Engineers Australia graduate competencies as a framework, and this paper reports findings from the most diverse cohort of students (n=260), of whom 49% were international students with English as their second language. The research identified differences between international and domestic students' perceptions of self and of career competencies, possibly related to selfesteem. Implications include improved confidence and motivation to learn as students consider their strengths, interests and goals. Further, the research raises the need for analysis of international students' cultural and educational background to determine how different cohorts of international students self-appraise and how they associate learning with their future careers.

Review of Scientific Instruments, 2015

We present a nanocalorimeter designed for the measurement of the dynamic heat capacity of thin fi... more We present a nanocalorimeter designed for the measurement of the dynamic heat capacity of thin films. The microfabricated sensor, the thermal conditioning of the sensor, as well as the highly stable and low noise electronic chain allow measurements of the real and imaginary parts of the complex specific heat with a resolution Δ C/C of about 10−5. The performances of this quasi-differential nanocalorimeter were tested on a model of polymeric glass-former, the polyvinyl acetate (PVAc). The high stability and low noise of the device are essential for accurate studies on non-equilibrium slow relaxing systems such as glasses.

2017 ASEE Annual Conference & Exposition Proceedings

She received her Ph.D. and M.S.Ed.in Educational Psychology with the specialties in Gifted Educat... more She received her Ph.D. and M.S.Ed.in Educational Psychology with the specialties in Gifted Education and Research Methods & Measurement, respectively from Purdue University. Her work centers on P-16 engineering education research, as a psychometrician, program evaluator, and institutional data analyst. She has authored/co-authored more than 30 journal articles and conference proceedings and served as a reviewer of journals in engineering education, STEM education, and educational psychology, as well as an external evaluator and an advisory board member on several NSF-funded projects.

2018 ASEE Annual Conference & Exposition Proceedings

Delivering significant results in pivotal roles such as Sr. Consultant to high-profile clients, S... more Delivering significant results in pivotal roles such as Sr. Consultant to high-profile clients, Sr. Project Manager directing teams, and Executive Leader of initiatives and programs that boost organizational effectiveness and optimize operations have been hallmarks of Dr. Wickliff's career spanning more than 24 years with leaders in the oil & gas and semiconductor industries. As an expert in the areas of Executive Leadership and Team Development, Strategy Design & Execution, Supply Chain Optimization, Change Management, System Integration and LEAN Process Improvement (technical and business), Dr. Wickliff is passionate about Organizational Wellness and the Holistic Wellness of individuals. She is also a professional Facilitator and Motivational Speaker. Dr. Wickliff earned a PhD in Interdisciplinary Engineering from Texas A&M University where she combined Industrial Engineering and Organizational Development to conduct research in the area of talent management and organizational effectiveness. She also completed an executive MBA from the University of Texas-Dallas and a BS in mechanical engineering from the University of Houston. She is founder of a nationally recognized pre-college initiative program, FreshStart, which has served more than 2000 students since its inception. Dr. Wickliff is blessed to work daily in the area of her passion-developing young professionals-in her role at Texas A&M University. She is a Professor of Engineering Practice. At Texas A&M University, she has taught Capstone Senior Design, Statics & Dynamics, Engineering Ethics, Engineering Leadership and Foundations of Engineering courses. She has also taught Project Management and Risk Management courses for the University of Phoenix.

2019 ASEE Annual Conference & Exposition Proceedings

Station (TEES). She received a Ph.D. in Educational Psychology with specialties in Gifted Educati... more Station (TEES). She received a Ph.D. in Educational Psychology with specialties in Gifted Education and a M.S.Ed. in Educational Psychology with specialties in Research Methods and Measurement both from Purdue University. She also holds a M.S. in Astronomy and Astrophysics and a B.S. in Astronomy and Meteorology both from Kyungpook National University in South Korea. Her work centers on engineering education research, as a psychometrician, program evaluator, and institutional data analyst. She has research interests on spatial ability, creativity, gifted education, STEM education, and meta-analyses. She has authored/co-authored more than 50 peer-reviewed journal articles and conference proceedings and served as a journal reviewer in engineering education, STEM education, and educational psychology, as well as a co-PI, an external evaluator or advisory board member on several NSF-funded projects (CA-REER, iCorps, REU, RIEF, etc.).

An approach to simulating the internal flows of supersonic propulsion systems is presented. The a... more An approach to simulating the internal flows of supersonic propulsion systems is presented. The approach is based on a fairly simple modification of the Large Perturbation Inlet (LAPIN) computer code. LAPIN uses a quasi-one dimensional, inviscid, unsteady formulation of the continuity, momentum, and energy equations. The equations are solved using a shock capturing, finite difference algorithm. The original code, developed for simulating supersonic inlets, includes engineering models of unstart/restart, bleed, bypass, and variable duct geometry, by means of source terms in the equations. The source terms also provide a mechanism for incorporating, with the inlet, propulsion system components such as compressor stages, combustors, and turbine stages. This requires each component to be distributed axially over a number of grid points. Because of the distributed nature of such components, this representation should be more accurate than a lumped parameter model. Components can be model...

Elsasser variables Jacques Richard & Sharath S. Girimaji Aerospace Engineering, Texas A&M Univers... more Elsasser variables Jacques Richard & Sharath S. Girimaji Aerospace Engineering, Texas A&M University, College Station, TX 77843, USA We examine the influence of a mean magnetic field on the decay of initially isotropic magneto-hydrodynamic (MHD) turbulence. Direct numerical simulations (DNS) MHD turbulence is performed using the magneto-hydrodynamic Lattice Boltzmann Method (MHD-LBM). The initial turbulence is isotropic and a uniform magnetic field is introduced. There are no fluctuations in the initial magnetic field. As the velocity and magnetic fields evolve, there is energy interchange between velocity and magnetic field as they approach equipartition (Figure 1). This approach is not monotonic and involves large excursions brought about by Alfven waves propagating through the flow system (Davidson, 2001). We analyze the velocity and magnetic field decay using Elsasser variables (Biskamp, 2003, Yoshizawa et al., 2003). Magnetic and kinetic energy spectra, magnetic and kinetic ani...

2014 ASEE Annual Conference & Exposition Proceedings

His research is focused on computational plasma modeling using spectral and lattice Boltzmann met... more His research is focused on computational plasma modeling using spectral and lattice Boltzmann methods for studying plasma turbulence and plasma jets. His research has also included fluid physics and electric propulsion using Lattice-Boltzmann methods, spectral element methods, Weighted Essentially Non-Oscillatory (WENO), etc. Past research includes modeling single and multi-species plasma flows through ion thruster optics and the discharge cathode assembly; computer simulations of blood flow interacting with blood vessels; modeling ocean-air interaction; reacting flow systems; modeling jet engine turbomachinery going unstable at NASA for 6 years (received NASA Performance Cash awards). Dr. Richard is involved in many outreach activities: e.g., tutoring, mentoring, directing related grants (for example, a grant for an NSF REU site). Dr, Richard is active in professional societies (American Physical Society (APS), American Institute for Aeronautics and Astronautics (AIAA), etc.), ASEE, ASME. Dr. Richard has authored or co-authored about 25 technical articles (19 of which are refereed publications). Dr. Richard teaches courses ranging from first-year introductory engineering design, fluid mechanics, to space plasma propulsion.

Board 132: Impact of a Research Experience Program in Aerospace Engineering on Undergraduate Students: Year Two

2019 ASEE Annual Conference & Exposition Proceedings

Lessons Learned by the Aerospace Engineering Department at Texas A University Following Its First Summer Camp for High School Students

2013 ASEE Annual Conference & Exposition Proceedings

Analysis of Laser-Generated Impulse In An Airbreathing Pulsed Detonation Engine: Part 1

AIP Conference Proceedings, 2005

An investigation is performed on an airbreathing laser propulsion (LP) system designed to propel ... more An investigation is performed on an airbreathing laser propulsion (LP) system designed to propel a 1.4 m diameter, 120-kg (dry mass) vehicle called the Lightcraft Technology Demonstrator (LTD) into low Earth orbit, along with its opto-electronics payload. The LTD concept led directly to the model No.200 lightcraft - recently demonstrated in laboratory and flight experiments at White Sands Missile Range,

MHD-LBM Simulations of Magnetic Field Effects on Axis-Switching and Instabilities in Rectangular Jets

Our objective is to assess the potential for flow control of plasma jets for space propulsion and... more Our objective is to assess the potential for flow control of plasma jets for space propulsion and high-altitude external flow applications. Toward this end, we study the effect of an externally applied magnetic field on rectangular plasma jets using a Magneto-hydrodynamic (MHD) Lattice ...

Low-order nonlinear dynamic model of IC engine-variable pitch propeller system for general aviation aircraft

ABSTRACT This paper presents a dynamic model of an internal combustion engine coupled to a variab... more ABSTRACT This paper presents a dynamic model of an internal combustion engine coupled to a variable pitch propeller. The low-order, nonlinear time-dependent model is useful for simulating the propulsion system of general aviation single-engine light aircraft. This model is suitable for investigating engine diagnostics and monitoring and for control design and development. Furthermore, the model may be extended to provide a tool for the study of engine emissions, fuel economy, component effects, alternative fuels, alternative engine cycles, flight simulators, sensors, and actuators. Results show that the model provides a reasonable representation of the propulsion system dynamics from zero to 10 Hertz.

Ion thrusters are the most efficient EP devices at converting input power to thrust and are used ... more Ion thrusters are the most efficient EP devices at converting input power to thrust and are used both as primary propulsion and for station-keeping on commercial and scientific spacecraft. Key issues include grid erosion and thrust density limitations from space-charge effects.

Acceleration of a Plasma Flow by Oscillating Magnetic Mirrors

44th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 2008

Implementation of a Spectral Decomposition of the Boltzmann Equation with the Streaming in the Lattice-Boltzmann Method

ABSTRACT Recent developments in mathematics have allowed for the collision process of the Boltzma... more ABSTRACT Recent developments in mathematics have allowed for the collision process of the Boltzmann equation to be discretized using spectral methods. This new method has the potential for replacing the Bhatnagar-Gross-Krook (BGK) approximation used in approaches such as the lattice-Boltzmann method (LBM). This would end the need for a low Mach approximation to the linearized Boltzmann equation in LBM. This allows solving the full Boltzmann equation and should therefore avoid many of the limitations of current approxima- tions. This paper shows a derivation for the spectral method as well as an implementation for a 2-D and 3-D test cases with results. A simulation of decaying isotropic turbulence is also presented.

Energy exchange in magnetohydrodynamic decaying isotropic turbulence

Proceedings of the Sixth International Symposium On Turbulence, Heat and Mass Transfer, 2009

Assessment of Magnetohydrodynamic Lattice Boltzmann Schemes in Turbulence and Rectangular Jets

International Journal of Modern Physics C, 2008

Two lattice Boltzmann method (LBM) formulations are possible to account for the effect of the mag... more Two lattice Boltzmann method (LBM) formulations are possible to account for the effect of the magnetic field on the velocity field in magnetohydrodynamic (MHD) flows. In the body-force formulation (BFF), the magnetic field effects manifest as an external acceleration. In the extended equilibrium formulation (EEF), the effect appears through a modified equilibrium distribution function. Further, for the velocity field itself, the available choices are the single-relaxation time (SRT) and multi-relaxation time (MRT) models. Thus, for MHD-LBM, there are four possible permutations: SRT-BFF, SRT-EEF, MRT-BFF and MRT-EEF. Numerical implementation of the first three have already been presented in the literature. In this work, we, (i) develop the numerical implementation of MRT-EEF and (ii) perform an assessment of the four possible approaches. Our results indicate that the MRT-EEF is the most robust and accurate of the MHD-LBM computational schemes examined.