DNS of compressible flow over rough surfaces with an adaptive WENO/CD scheme

Tan, Raynold, Sandham, Neil and Deiterding, Ralf (2022) DNS of compressible flow over rough surfaces with an adaptive WENO/CD scheme. 33rd Parallel CFD International Conference, , Alba, Italy. 25 - 27 May 2022. 4 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

In this study, Direct Numerical Simulation (DNS) of compressible flow over a set of smooth and rough surfaces is carried out in a turbulent channel flow configuration. The aim is to quantify the Hamas roughness function for different rough wall geometries under the effects of compressibility. For this study, a flow with bulk Reynolds number 6000 and Mach number 1:5 is considered. A level-set ghost-fluid method is used to represent the rough wall geometry. The rough surfaces considered are a grit-blasted sample, graphite and a manufactured sawtooth geometry with the same mean roughness height as the grid-blasted surface. It was found that the grit-blasted surface has the largest roughness function as compared to the other ones. Although the sawtooth and grit-blasted surfaces have the same mean roughness height, the difference in their roughness function suggests that other topological features of the rough surface can influence the roughness function independently of the mean roughness height.

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