A new turbulence model with the separate consideration of large and small vortexes
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Recently the k-ε model has been widely used, but it is a kind of gradient model. Because the life-time of turbulence vortexes is very long, in common flow problems the influence of up-stream vortexes must be important, and the vortexes are not in quasi-equilibrium. So the usefulness of the k-ε model and other gradient models is limited. In this paper, according to actual cases of the turbulence, the velocity fluctuations are separated into large and small vortexes, and the large vortexes consist of two parts, one comes from up-stream and around, the other is locally generated. Thus we get a turbulence model, which consists of three parts.
KeywordsVortex Vorticity Turbulence Model Reynolds Stress Velocity Fluctuation
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