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Research paper thumbnail of Application of Reynolds Stress Models to High-Lift Aerodynamics Applications

Engineering Turbulence Modelling and Experiments 6, 2005

ABSTRACT

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Research paper thumbnail of Stabililty and laminarisation of turbulent rotating channel flow

Springer Proceedings in Physics, 2009

The influence of moderate rotation rate on turbulent channel flow is that the turbulence is suppr... more The influence of moderate rotation rate on turbulent channel flow is that the turbulence is suppressed on the stable side and augmented on the unstable side because of the Coriolis force. With increasing rotation rate the turbulent region becomes restricted to a decreasing zone near the unstable wall. For the rotation number, Ro > 3 (normalized by bulk velocity and

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Research paper thumbnail of Aeroacoustic Assessment of Conceptual Low-Noise High-Lift Wing Configurations

50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, 2012

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Research paper thumbnail of Surface Integral Analogy Approaches to Computing Noise Generated by a 3D High-Lift Wing Configuration

50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, 2012

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Research paper thumbnail of Local flow properties in relation to noise generation for low-noise high-lift configurations

50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, 2012

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Research paper thumbnail of Assessment of High-lift Concepts for a Regional Aircraft in the ALONOCO Project

50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, 2012

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Research paper thumbnail of Surface integral analogy approaches for predicting noise from 3D high-lift low-noise wings

Acta Mechanica Sinica, 2014

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Research paper thumbnail of Different explicit algebraic reynolds stress model representations and their predictions of fully developed turbulent rotating pipe flow

The least square projection method is used for obtaining optimal EARSMs for different incomplete ... more The least square projection method is used for obtaining optimal EARSMs for different incomplete sets of basis tensors. The possible singular behaviour depending on the choice of the basis tensors ...

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Research paper thumbnail of Scale sensitivity of velocity and pressure correlations in channel flow

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Research paper thumbnail of Direct numerical simulations of stratified turbulence at higher Reynolds numbers

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Research paper thumbnail of Laminarization mechanisms in rotating channel flow

The influence of moderate rotation rate on turbulent channel flow is that the turbulence is suppr... more The influence of moderate rotation rate on turbulent channel flow is that the turbulence is suppressed on the stable side and augmented on the unstable side because of the Coriolis force. When the rotation increases the turbulent region becomes restricted to an increasingly thin zone near the unstable wall. For a rotation rate, Ro>3 (normalized by bulk velocity and channel

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Research paper thumbnail of New DNS and modeling results for turbulent pipe flow

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Research paper thumbnail of A generalized EARSM based on a nonlinear pressure strain rate model

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Research paper thumbnail of Techniques for deriving explicit algebraic Reynolds stress models based on incomplete sets of basis tensors and predictions of fully developed rotating pipe flow

Physics of Fluids, 2005

Different techniques for deriving explicit algebraic Reynolds stress models (EARSMs) using incomp... more Different techniques for deriving explicit algebraic Reynolds stress models (EARSMs) using incomplete sets of basis tensors are discussed. The first is the Galerkin method which has been used by several authors. The second alternative technique, proposed here, is based on the least-squares method. The idea behind the latter method is to minimize the error induced in the implicit relation, i.e., the algebraic Reynolds stress model (ARSM) equation, due to the use of incomplete sets of basis tensors. It is argued that since the system matrix of the ARSM equation is not symmetric and positive definite, the Galerkin method does not give EARSMs that are optimal in the strict classical sense. The possible singular behavior depending on the choice of the basis tensors has also been investigated. It is demonstrated that many of the EARSMs based on incomplete tensor bases, expressed in general three-dimensional mean flows, have singularity problems in some flows, such as general two-dimension...

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Research paper thumbnail of Direct numerical simulations of rotating turbulent channel flow

Journal of Fluid Mechanics, 2008

Fully developed rotating turbulent channel flow has been studied, through direct numerical simula... more Fully developed rotating turbulent channel flow has been studied, through direct numerical simulations, for the complete range of rotation numbers for which the flow is turbulent. The present investigation suggests that complete flow laminarization occurs at a rotation number Ro = 2/Ub denotes the system rotation, Ub is the mean bulk velocity and = u/ is the wall-shear velocity and

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Research paper thumbnail of Explicit algebraic subgrid stress models with application to rotating channel flow

Journal of Fluid Mechanics, 2009

New explicit subgrid stress models are proposed involving the strain rate and rotation rate tenso... more New explicit subgrid stress models are proposed involving the strain rate and rotation rate tensor, which can account for rotation in a natural way. The new models are based on the same methodology that leads to the explicit algebraic Reynolds stress model formulation for Reynolds-averaged Navier–Stokes simulations. One dynamic model and one non-dynamic model are proposed. The non-dynamic model represents a computationally efficient subgrid scale (SGS) stress model, whereas the dynamic model is the most accurate. The models are validated through large eddy simulations (LESs) of spanwise and streamwise rotating channel flow and are compared with the standard and dynamic Smagorinsky models. The proposed explicit dependence on the system rotation improves the description of the mean velocity profiles and the turbulent kinetic energy at high rotation rates. Comparison with the dynamic Smagorinsky model shows that not using the eddy-viscosity assumption improves the description of both t...

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Research paper thumbnail of Laminarization mechanisms and extreme-amplitude states in rapidly rotating plane channel flow

Journal of Fluid Mechanics, 2013

Fully developed plane channel flow rotating in the spanwise direction has been studied analytical... more Fully developed plane channel flow rotating in the spanwise direction has been studied analytically and numerically. Linear stability analysis reveals that all cross-flow modes are stable for supercritical rotation numbers, RogtRocRo\gt R{o}_{c} RogtRoc, where RocR{o}_{c} Roc will approach 3 from below for increasing Reynolds number. Plane Tollmien–Schlichting (TS) waves are independent of rotation and always linearly unstable for supercritical Reynolds numbers. Direct numerical simulation (DNS) of the laminarization process reveals that the turbulence is damped when RoRoRo approaches RocR{o}_{c} Roc. Hence, the laminarization is dominated by linear mechanisms. The flow becomes periodic for supercritical Reynolds numbers and rotation rates, i.e. when RogtRocRo\gt R{o}_{c} RogtRoc and RegtRecRe\gt R{e}_{c} RegtRec. At such rotation rates, all oblique (cross-flow) modes are damped and when the disturbance amplitude becomes small enough, the TS modes start to grow exponentially. Secondary instabilities are initially blocked by the...

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Research paper thumbnail of An explicit algebraic Reynolds stress model based on a nonlinear pressure strain rate model

International Journal of Heat and Fluid Flow, 2005

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Research paper thumbnail of A priori evaluations and least-squares optimizations of turbulence models for fully developed rotating turbulent channel flow

European Journal of Mechanics - B/Fluids, 2008

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Research paper thumbnail of Observations on the predictions of fully developed rotating pipe flow using differential and explicit algebraic Reynolds stress models

European Journal of Mechanics - B/Fluids, 2006

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Research paper thumbnail of Application of Reynolds Stress Models to High-Lift Aerodynamics Applications

Engineering Turbulence Modelling and Experiments 6, 2005

ABSTRACT

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Stabililty and laminarisation of turbulent rotating channel flow

Springer Proceedings in Physics, 2009

The influence of moderate rotation rate on turbulent channel flow is that the turbulence is suppr... more The influence of moderate rotation rate on turbulent channel flow is that the turbulence is suppressed on the stable side and augmented on the unstable side because of the Coriolis force. With increasing rotation rate the turbulent region becomes restricted to a decreasing zone near the unstable wall. For the rotation number, Ro > 3 (normalized by bulk velocity and

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Aeroacoustic Assessment of Conceptual Low-Noise High-Lift Wing Configurations

50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, 2012

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Surface Integral Analogy Approaches to Computing Noise Generated by a 3D High-Lift Wing Configuration

50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, 2012

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Local flow properties in relation to noise generation for low-noise high-lift configurations

50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, 2012

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Assessment of High-lift Concepts for a Regional Aircraft in the ALONOCO Project

50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, 2012

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Surface integral analogy approaches for predicting noise from 3D high-lift low-noise wings

Acta Mechanica Sinica, 2014

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Different explicit algebraic reynolds stress model representations and their predictions of fully developed turbulent rotating pipe flow

The least square projection method is used for obtaining optimal EARSMs for different incomplete ... more The least square projection method is used for obtaining optimal EARSMs for different incomplete sets of basis tensors. The possible singular behaviour depending on the choice of the basis tensors ...

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Research paper thumbnail of Scale sensitivity of velocity and pressure correlations in channel flow

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Direct numerical simulations of stratified turbulence at higher Reynolds numbers

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Laminarization mechanisms in rotating channel flow

The influence of moderate rotation rate on turbulent channel flow is that the turbulence is suppr... more The influence of moderate rotation rate on turbulent channel flow is that the turbulence is suppressed on the stable side and augmented on the unstable side because of the Coriolis force. When the rotation increases the turbulent region becomes restricted to an increasingly thin zone near the unstable wall. For a rotation rate, Ro>3 (normalized by bulk velocity and channel

Bookmarks Related papers MentionsView impact

Research paper thumbnail of New DNS and modeling results for turbulent pipe flow

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A generalized EARSM based on a nonlinear pressure strain rate model

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Techniques for deriving explicit algebraic Reynolds stress models based on incomplete sets of basis tensors and predictions of fully developed rotating pipe flow

Physics of Fluids, 2005

Different techniques for deriving explicit algebraic Reynolds stress models (EARSMs) using incomp... more Different techniques for deriving explicit algebraic Reynolds stress models (EARSMs) using incomplete sets of basis tensors are discussed. The first is the Galerkin method which has been used by several authors. The second alternative technique, proposed here, is based on the least-squares method. The idea behind the latter method is to minimize the error induced in the implicit relation, i.e., the algebraic Reynolds stress model (ARSM) equation, due to the use of incomplete sets of basis tensors. It is argued that since the system matrix of the ARSM equation is not symmetric and positive definite, the Galerkin method does not give EARSMs that are optimal in the strict classical sense. The possible singular behavior depending on the choice of the basis tensors has also been investigated. It is demonstrated that many of the EARSMs based on incomplete tensor bases, expressed in general three-dimensional mean flows, have singularity problems in some flows, such as general two-dimension...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Direct numerical simulations of rotating turbulent channel flow

Journal of Fluid Mechanics, 2008

Fully developed rotating turbulent channel flow has been studied, through direct numerical simula... more Fully developed rotating turbulent channel flow has been studied, through direct numerical simulations, for the complete range of rotation numbers for which the flow is turbulent. The present investigation suggests that complete flow laminarization occurs at a rotation number Ro = 2/Ub denotes the system rotation, Ub is the mean bulk velocity and = u/ is the wall-shear velocity and

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Explicit algebraic subgrid stress models with application to rotating channel flow

Journal of Fluid Mechanics, 2009

New explicit subgrid stress models are proposed involving the strain rate and rotation rate tenso... more New explicit subgrid stress models are proposed involving the strain rate and rotation rate tensor, which can account for rotation in a natural way. The new models are based on the same methodology that leads to the explicit algebraic Reynolds stress model formulation for Reynolds-averaged Navier–Stokes simulations. One dynamic model and one non-dynamic model are proposed. The non-dynamic model represents a computationally efficient subgrid scale (SGS) stress model, whereas the dynamic model is the most accurate. The models are validated through large eddy simulations (LESs) of spanwise and streamwise rotating channel flow and are compared with the standard and dynamic Smagorinsky models. The proposed explicit dependence on the system rotation improves the description of the mean velocity profiles and the turbulent kinetic energy at high rotation rates. Comparison with the dynamic Smagorinsky model shows that not using the eddy-viscosity assumption improves the description of both t...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Laminarization mechanisms and extreme-amplitude states in rapidly rotating plane channel flow

Journal of Fluid Mechanics, 2013

Fully developed plane channel flow rotating in the spanwise direction has been studied analytical... more Fully developed plane channel flow rotating in the spanwise direction has been studied analytically and numerically. Linear stability analysis reveals that all cross-flow modes are stable for supercritical rotation numbers, RogtRocRo\gt R{o}_{c} RogtRoc, where RocR{o}_{c} Roc will approach 3 from below for increasing Reynolds number. Plane Tollmien–Schlichting (TS) waves are independent of rotation and always linearly unstable for supercritical Reynolds numbers. Direct numerical simulation (DNS) of the laminarization process reveals that the turbulence is damped when RoRoRo approaches RocR{o}_{c} Roc. Hence, the laminarization is dominated by linear mechanisms. The flow becomes periodic for supercritical Reynolds numbers and rotation rates, i.e. when RogtRocRo\gt R{o}_{c} RogtRoc and RegtRecRe\gt R{e}_{c} RegtRec. At such rotation rates, all oblique (cross-flow) modes are damped and when the disturbance amplitude becomes small enough, the TS modes start to grow exponentially. Secondary instabilities are initially blocked by the...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of An explicit algebraic Reynolds stress model based on a nonlinear pressure strain rate model

International Journal of Heat and Fluid Flow, 2005

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A priori evaluations and least-squares optimizations of turbulence models for fully developed rotating turbulent channel flow

European Journal of Mechanics - B/Fluids, 2008

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Observations on the predictions of fully developed rotating pipe flow using differential and explicit algebraic Reynolds stress models

European Journal of Mechanics - B/Fluids, 2006

Bookmarks Related papers MentionsView impact