8th European Postgraduate Fluid Dynamics Conference

6th – 9th July 2016
Warsaw, Poland

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A simple criterion for assessing mesh resolution of RANS methods

A.A. Gavrilov1, A.V. Shebelev2
1Institute of Thermophysics SB RAS
2Siberian Federal University, department of Thermophisics
We propose simple criterion for assessing of mesh resolution for grid-independent RANS solutions of turbulent flows. The criterion has been deduced based on a posteriori assessment of local field interpolation error for turbulent kinetic energy.

The proposed criterion was tested on the several cases. In this paper, the proposed criterion was applied to unsteady periodicdetached turbulent flow over semicircle profile at zero angle of attack at Reynolds number Re=50000 (Fig. 1). Two eddyviscosityRANS models k-\(\omega \) SST with curvature correction and model with elliptical relaxation k-e-\(\zeta \)-f were used for modeling.

Numerical study shown that mesh resolution in wake does not affect on flow near body, in particularly, on integral forces acting on streamlined body. It was shown that introduced criterion allows properly to assess mesh resolution requiredfor grid-independent solution away from the
Keywords: Computational methods, Turbulence
Figure 1: The result of computational modeling. Vortex path after semicircular bodyat Reynolds number