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Papers by Kathy Simmons

Research paper thumbnail of Film Flow Around Bearing Chamber Support Structures

Volume 3: Turbo Expo 2005, Parts A and B, 2005

ABSTRACT

Research paper thumbnail of IMechE seminar Dec1999 - presentation slides and speakers notes

Research paper thumbnail of Application of CFD to modelling twophase flow in a high-speed aero-engine transmission chamber

Research paper thumbnail of Numerical Study of the Two-Phase Air/Oil Flow Within an Aero-Engine Bearing Chamber Model Using a Coupled Lagrangian Droplet Tracking Method

Computational Technologies for Fluid/Thermal/Structural/Chemical Systems With Industrial Applications, Volume 1, 2002

Research paper thumbnail of CFD study of droplet motion in a simplified breather chamber geometry at high shaft rotating speeds

Research paper thumbnail of Numerical study of the turbulent air flow field and droplet trajectories in a geometrically simplified bearing chamber with the presence of an oil-air separator

International Journal of Rotating Machinery

Research paper thumbnail of Using CFD to Improve Aero-Engine Air/Oil Separator Design

Computational Technologies for Fluid/Thermal/Structural/Chemical Systems With Industrial Applications, Volume 1, 2002

Research paper thumbnail of A CFD Simulation of Oil-Air Flow Between the Cage and Inner Race of an Aeroengine Bearing

Journal of Engineering for Gas Turbines and Power, 2016

Research paper thumbnail of Experimental Investigation Into Droplet Impingement Upon Moving Films Using High Speed Video and Thermal Imaging

Volume 1: Advances in Aerospace Technology, 2015

Research paper thumbnail of A Multiphase Computational Study of Oil-Air Flow Within the Bearing Sector of Aeroengines

Volume 5C: Heat Transfer, 2015

Research paper thumbnail of Two-Phase Computational Modelling of a Spiral Bevel Gear Using a Eulerian Multiphase Model

Volume 5C: Heat Transfer, 2015

Research paper thumbnail of Numerical study of the turbulent air flow field and droplet trajectories in a geometrically simplified bearing chamber with the presence of an oil-air separator

International Journal of Rotating Machinery

Research paper thumbnail of Velocity Measurements in the Vicinity of the Exit and Inlet of a Spiral Bevel Gear Shroud

Volume 5C: Heat Transfer, 2015

Research paper thumbnail of Droplet-Film Impact Modelling Using a Coupled DPM-Vof Approach

In aero engine bearing chambers oil is supplied for lubrication and cooling. Oil travels to the c... more In aero engine bearing chambers oil is supplied for lubrication and cooling. Oil travels to the chamber outer walls creating films that transport heat away from the hot surfaces. High speed oil droplets within the core flow impact onto surfaces and films during engine operation. To model this type of flow, there is a need to be able to account for the multiple impacting droplets and the resulting cooling film. Resolving the droplets explicitly is not yet computationally feasible for a full bearing chamber. A coupled Lagrangian-Eulerian methodology is therefore presented to describe the phenomenon at an affordable cost. The droplets are assumed to be point particles and coupled with the Eulerian phase upon impact. Test cases reported here compare well with published literature.

Research paper thumbnail of A coupled 3-phase CFD approach to model droplets to film interaction with heat transfer

This paper presents a low cost Computational Fluid Dynamics (CFD) technique for the modelling of ... more This paper presents a low cost Computational Fluid Dynamics (CFD) technique for the modelling of droplet to film impact with heat transfer. In this approach the liquid and gas continua are modelled using an enhanced Volume of Fluid (VoF) technique while the droplets are tracked using a Lagrangian framework and are coupled to the Eulerian phases using source terms. The eventual target application is an aeroengine bearing chamber in which oil is found as droplets, shed from the bearings, separated from wall surfaces at obstacles or simply re-entrained, and as a continuum oil film coating the chamber outer walls which it also cools. A generic algorithm has therefore been developed to track the gas-liquid interface and determine the occurrence and scenario and outcome of impact between the Lagrangian and Eulerian representations of the liquid, based on correlations. The proposed technique has been tested for the case of a spray nozzle and satisfactorily evaluated against published exper...

Research paper thumbnail of Numerical Study of the Two-Phase Air/Oil Flow Within an Aero-Engine Bearing Chamber Model Using a Coupled Lagrangian Droplet Tracking Method

Computational Technologies for Fluid/Thermal/Structural/Chemical Systems With Industrial Applications, Volume 1, 2002

Research paper thumbnail of Transient Two-Phase Effects in an Aeroengine Bearing Chamber Scavenge Test Rig

Volume 1: Advances in Aerospace Technology, 2014

Research paper thumbnail of A Transient CFD Simulation of the Flow in a Test Rig of an Aeroengine Bearing Chamber

Volume 5C: Heat Transfer, 2014

Research paper thumbnail of Computational Investigation of Flows and Pressure Fields Associated With Spur Gear Meshing

Volume 5C: Heat Transfer, 2014

Research paper thumbnail of A Numerical Model for Oil Film Flow in an Aero-Engine Bearing Chamber and Comparison With Experimental Data

Volume 4: Turbo Expo 2004, 2004

Research paper thumbnail of Film Flow Around Bearing Chamber Support Structures

Volume 3: Turbo Expo 2005, Parts A and B, 2005

ABSTRACT

Research paper thumbnail of IMechE seminar Dec1999 - presentation slides and speakers notes

Research paper thumbnail of Application of CFD to modelling twophase flow in a high-speed aero-engine transmission chamber

Research paper thumbnail of Numerical Study of the Two-Phase Air/Oil Flow Within an Aero-Engine Bearing Chamber Model Using a Coupled Lagrangian Droplet Tracking Method

Computational Technologies for Fluid/Thermal/Structural/Chemical Systems With Industrial Applications, Volume 1, 2002

Research paper thumbnail of CFD study of droplet motion in a simplified breather chamber geometry at high shaft rotating speeds

Research paper thumbnail of Numerical study of the turbulent air flow field and droplet trajectories in a geometrically simplified bearing chamber with the presence of an oil-air separator

International Journal of Rotating Machinery

Research paper thumbnail of Using CFD to Improve Aero-Engine Air/Oil Separator Design

Computational Technologies for Fluid/Thermal/Structural/Chemical Systems With Industrial Applications, Volume 1, 2002

Research paper thumbnail of A CFD Simulation of Oil-Air Flow Between the Cage and Inner Race of an Aeroengine Bearing

Journal of Engineering for Gas Turbines and Power, 2016

Research paper thumbnail of Experimental Investigation Into Droplet Impingement Upon Moving Films Using High Speed Video and Thermal Imaging

Volume 1: Advances in Aerospace Technology, 2015

Research paper thumbnail of A Multiphase Computational Study of Oil-Air Flow Within the Bearing Sector of Aeroengines

Volume 5C: Heat Transfer, 2015

Research paper thumbnail of Two-Phase Computational Modelling of a Spiral Bevel Gear Using a Eulerian Multiphase Model

Volume 5C: Heat Transfer, 2015

Research paper thumbnail of Numerical study of the turbulent air flow field and droplet trajectories in a geometrically simplified bearing chamber with the presence of an oil-air separator

International Journal of Rotating Machinery

Research paper thumbnail of Velocity Measurements in the Vicinity of the Exit and Inlet of a Spiral Bevel Gear Shroud

Volume 5C: Heat Transfer, 2015

Research paper thumbnail of Droplet-Film Impact Modelling Using a Coupled DPM-Vof Approach

In aero engine bearing chambers oil is supplied for lubrication and cooling. Oil travels to the c... more In aero engine bearing chambers oil is supplied for lubrication and cooling. Oil travels to the chamber outer walls creating films that transport heat away from the hot surfaces. High speed oil droplets within the core flow impact onto surfaces and films during engine operation. To model this type of flow, there is a need to be able to account for the multiple impacting droplets and the resulting cooling film. Resolving the droplets explicitly is not yet computationally feasible for a full bearing chamber. A coupled Lagrangian-Eulerian methodology is therefore presented to describe the phenomenon at an affordable cost. The droplets are assumed to be point particles and coupled with the Eulerian phase upon impact. Test cases reported here compare well with published literature.

Research paper thumbnail of A coupled 3-phase CFD approach to model droplets to film interaction with heat transfer

This paper presents a low cost Computational Fluid Dynamics (CFD) technique for the modelling of ... more This paper presents a low cost Computational Fluid Dynamics (CFD) technique for the modelling of droplet to film impact with heat transfer. In this approach the liquid and gas continua are modelled using an enhanced Volume of Fluid (VoF) technique while the droplets are tracked using a Lagrangian framework and are coupled to the Eulerian phases using source terms. The eventual target application is an aeroengine bearing chamber in which oil is found as droplets, shed from the bearings, separated from wall surfaces at obstacles or simply re-entrained, and as a continuum oil film coating the chamber outer walls which it also cools. A generic algorithm has therefore been developed to track the gas-liquid interface and determine the occurrence and scenario and outcome of impact between the Lagrangian and Eulerian representations of the liquid, based on correlations. The proposed technique has been tested for the case of a spray nozzle and satisfactorily evaluated against published exper...

Research paper thumbnail of Numerical Study of the Two-Phase Air/Oil Flow Within an Aero-Engine Bearing Chamber Model Using a Coupled Lagrangian Droplet Tracking Method

Computational Technologies for Fluid/Thermal/Structural/Chemical Systems With Industrial Applications, Volume 1, 2002

Research paper thumbnail of Transient Two-Phase Effects in an Aeroengine Bearing Chamber Scavenge Test Rig

Volume 1: Advances in Aerospace Technology, 2014

Research paper thumbnail of A Transient CFD Simulation of the Flow in a Test Rig of an Aeroengine Bearing Chamber

Volume 5C: Heat Transfer, 2014

Research paper thumbnail of Computational Investigation of Flows and Pressure Fields Associated With Spur Gear Meshing

Volume 5C: Heat Transfer, 2014

Research paper thumbnail of A Numerical Model for Oil Film Flow in an Aero-Engine Bearing Chamber and Comparison With Experimental Data

Volume 4: Turbo Expo 2004, 2004

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