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The Comparison, Improvement and Application of Turbulence Models

Author: ZhuXuDong
Tutor: ZhouChunHua
School: Nanjing University of Aeronautics and Astronautics
Course: Fluid Mechanics
Keywords: N-S equation Turbulence model High Reynolds number flow Artificial viscosity Triangular mesh
CLC: O357.5
Type: Master's thesis
Year: 2005
Downloads: 1063
Quote: 4
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This article discusses the algebraic turbulence model and the two - equation turbulence model in the numerical solution of the Reynolds averaged NS equations and turbulence model , some of the improvement and development . The NS equations space is discrete Galerkin finite element format , the time to promote the application of explicit in five steps RK format . NS equation numerical viscosity in order to ensure a high Reynolds number is much smaller than the physical viscous artificial viscosity term directional correction and the introduction of appropriate boundary conditions . The SST turbulence equation solving implicit format , point-of-use time advancing and thus lifted due to the presence of a source term due to the restrictions of the time step , to ensure stability when the turbulence equations and flow equations to proceed . The convective terms in the turbulence equations , discrete, first-order upwind scheme in order to further ensure the positive value of the time to promote stability and turbulence variables . Finally , through numerical experiments of various turbulence model comparison summary grid and other factors , such as computing , given the large number of numerical results are compared with experimental results in order to verify the improvement of this article on the development of numerical methods and turbulence models .

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CLC: > Mathematical sciences and chemical > Mechanics > Fluid Mechanics > Viscous fluid > Turbulence ( turbulence )
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