| A study on turbulence transportation and modification of Spalart–Allmaras model for shock-wave/turbulent boundary layer interaction flow |
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| 基金项目： | supported by the National Natural Science Foundation of China (No.11302012,51376001,51136003);the National Basic Research Program of China (No.2012CB720205);the National Magnetic Confinement Fusion Research Program of China (No.2012GB102006);the Aeronautical Science Foundation of China (No.2012ZB51014);the ‘‘111’’ Project(No.B08009);the Astronautical Technology Innovation Foundation of China |
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| 摘 要： | It is of great significance to improve the accuracy of turbulence models in shock-wave/ boundary layer interaction flow. The relationship between the pressure gradient, as well as the shear layer, and the development of turbulent kinetic energy in impinging shock-wave/turbulent boundary layer interaction flow at Mach 2.25 is analyzed based on the data of direct numerical simulation(DNS). It is found that the turbulent kinetic energy is amplified by strong shear in the separation zone and the adverse pressure gradient near the separation point. The pressure gradient was non-dimensionalised with local density, velocity, and viscosity. Spalart–Allmaras(S–A) model is modified by introducing the non-dimensional pressure gradient into the production term of the eddy viscosity transportation equation. Simulation results show that the production and dissipation of eddy viscosity are strongly enhanced by the modification of S–A model. Compared with DNS and experimental data, the wall pressure and the wall skin friction coefficient as well as the velocity profile of the modified S–A model are obviously improved. Thus it can be concluded that the modification of S–A model with the pressure gradient can improve the predictive accuracy for simulating the shock-wave/turbulent boundary layer interaction.
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| 关 键 词： | Eddy viscosity Pressure gradient Shock-wave/turbulent boundary layer interaction Spalart–Allmaras model Turbulent kinetic energy transport property |
| 收稿时间： | 2 May 2013 |
A study on turbulence transportation and modification of Spalart-Allmaras model for shock-wave/turbulent boundary layer interaction flow |
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| Authors: | Ma Li Lu Lipeng Fang Jian Wang Qiuhui |
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| Institution: | National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics, School of Energy and Power Engineering, Beihang University, Beijing 100191, China |
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| Abstract: | It is of great significance to improve the accuracy of turbulence models in shock-wave/boundary layer interaction flow. The relationship between the pressure gradient, as well as the shear layer, and the development of turbulent kinetic energy in impinging shock-wave/turbulent boundary layer interaction flow at Mach 2.25 is analyzed based on the data of direct numerical simulation (DNS). It is found that the turbulent kinetic energy is amplified by strong shear in the separation zone and the adverse pressure gradient near the separation point. The pressure gradient was non-dimensionalised with local density, velocity, and viscosity. Spalart-Allmaras (S-A) model is modified by introducing the non-dimensional pressure gradient into the production term of the eddy viscosity transportation equation. Simulation results show that the production and dissipation of eddy viscosity are strongly enhanced by the modification of S-A model. Compared with DNS and experimental data, the wall pressure and the wall skin friction coefficient as well as the velocity profile of the modified S-A model are obviously improved. Thus it can be concluded that the modification of S-A model with the pressure gradient can improve the predictive accuracy for simulating the shock-wave/turbulent boundary layer interaction. |
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| Keywords: | Eddy viscosity Pressure gradient Shock-wave/turbulent boundary layer interaction Spalart-Allmaras model Turbulent kinetic energy transport property |
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