Simulation of Flow over Pseudo-Random Rough Surfaces

J. Yang, A. Stroh () and P. Forooghi
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J. Yang: Karlsruhe Institute of Technoligy (KIT), Institute of Fluid Mechanics (ISTM)
A. Stroh: Karlsruhe Institute of Technoligy (KIT), Institute of Fluid Mechanics (ISTM)
P. Forooghi: Aarhus University, Department of Mecahnical and Production Engineering

A chapter in High Performance Computing in Science and Engineering '20, 2021, pp 387-400 from Springer

Abstract: Abstract Direct Numerical Simulation (DNS) is used to study fully developed turbulent flow over a number of irregular rough surfaces in periodic plane channels. DNS in minimal channels, initially proposed by Chung et al. [7], is examined and generalized in the present research. To this end the DNS results for flow in channels with reduced streamwise and spanwise sizes (so-called minimal channels) are compared to those in large channels. Generation of roughness is based on a mathematical algorithm in which the height power spectrum of the roughness along with its height probability distribution can be prescribed (hence the term “pseudo-random” rough surface). This approach allows generation of roughness samples that may be considered as surrogates of realistic roughness and can replace the costly process of scanning industrial surfaces.

Date: 2021
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DOI: 10.1007/978-3-030-80602-6_25

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