Approximate Coordinate Transformations for Simulation of Turbulent Flows with Active Wall Motions

- Journal title : Transactions of the Korean Society of Mechanical Engineers B
- Volume 25, Issue 11, 2001, pp.1467-1475
- Publisher : The Korean Society of Mechanical Engineers
- DOI : 10.22634/KSME-B.2001.25.11.1467

Title & Authors

Approximate Coordinate Transformations for Simulation of Turbulent Flows with Active Wall Motions

Gang, Sang-Mo;

Gang, Sang-Mo;

Abstract

In the present paper, approximate coordinate transformations for simulation of turbulent flows with active wall motions, leading to a significant reduction in the computational cost while maintaining the numerical accuracy, are presented: the Navier-Stokes equations are coordinate-transformed with an approximation of Taylor-series truncation and neglect of some less-significant terms. The performance of the proposed transformations is evaluated in simulation of the channel flow at Re/=140 with wall deformations of │ηm/+/ 5. The approximate transformations provide flow structures as wall as turbulence statistics in good agreement with those from a complete coordinate transformation [Phys. Fluids 12, 3301 (2000)] and allow 25-30% savings in the CPU time as compared to the complete one.

Keywords

Turbulence Control;Drag Reduction;Active Wall Motion;Approximate Coordinate Transformation;

Language

Korean

References

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Kang, S. and Choi, H., 2000, 'Active Wall Motions for Skin-Friction Drag Reduction,' Phys. Fluids, 12, p. 3301