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| Numerical simulation of backward facing step flow |
| Revised:September 26, 2001 |
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| DOI：10.7511/jslx20033070 |
| KeyWord:the second order full expansion Euler-Taylor-Galerkin (ETG) finite element method,large eddy simulation (LES),Gauss filter,subsgrid model (SGS),backward facing step flow |
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| Abstract: |
| Basic thought of the large eddy simulation(LES) is presented. It is pointed out that the efficiency of LES depends mainly on the four factors--Large scale eddies, reasonable calculating scheme, appropriate filter and subsgrid mode. Based on considering the role of each term of Navier\|Stokes equations for the incompressible viscous flow, the second order full expansion Euler\|Taylor\|Galerkin (ETG) finite element method is deduced and is used as the calculating scheme for LES. Cooperated with the Gauss filter, the large eddy simulation of the flow over a backward\|facing step is carried out. The results agree well with that of the given reference. Since the rich eddies are captured and the vortex flow process is shown, LES is applicable to simulate the flow in the domains with complex geometry boundaries. The second order full ETG finite element method is also used to simulate the incompressible viscous flow of low Reynolds number. It is proved that the second order full expansion Euler\|Taylor\|Galerkin (ETG) finite element method can be used to simulate such kind of flow independently. |
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