Interface-Resolved Direct Numerical Simulation of Turbulent Flow over Porous Media

Xu Chu (), Johannes Müller and Bernhard Weigand
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Xu Chu: University of Stuttgart, Institute of Aerospace Thermodynamics
Johannes Müller: University of Stuttgart, Institute of Aerospace Thermodynamics
Bernhard Weigand: University of Stuttgart, Institute of Aerospace Thermodynamics

A chapter in High Performance Computing in Science and Engineering '19, 2021, pp 343-354 from Springer

Abstract: Abstract Direct numerical simulations (DNS) are conducted for turbulent flows over porous media. A high-order spectral/hp element method is adopted for solving the incompressible Navier-Stokes equations. Resolving flow details close to the interface relies on an adaptive polynomial refinement based on a conforming mesh. Four DNS cases up to bulk Reynolds number $$Re=15{,}000$$ R e = 15 , 000 are conducted with a total mesh resolution up to 1 billion degrees of freedom. The highly-resolved DNS enables us to focus on two major physical phenomenon: (i) the turbulence modulation including drag reduction and flow control; (ii) the turbulent/non-turbulent interface close to the porous surface. The numerical solver exhibits an excellent scalability up to 96k cores on Hazel Hen. Strong scaling tests indicate an efficiency of 70 $$\%$$ % with around 5, 000 mesh-nodes per core, which indicates a high potential for an adequate use of current and next-generation HPC platforms to investigate turbulent flows over porous media.

Date: 2021
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DOI: 10.1007/978-3-030-66792-4_23

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