Numerical Analysis of Relaminarization in Turbulent Channel Flow

Sandeep Pandey (), Cenk Evrim () and Eckart Laurien ()
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Sandeep Pandey: University of Stuttgart, Institute of Nuclear Technology and Energy Systems
Cenk Evrim: University of Stuttgart, Institute of Nuclear Technology and Energy Systems
Eckart Laurien: University of Stuttgart, Institute of Nuclear Technology and Energy Systems

A chapter in High Performance Computing in Science and Engineering '19, 2021, pp 409-421 from Springer

Abstract: Abstract The turbulent channel flow subjected to a wall-normal, non-uniform body force is investigated here by means of direct numerical simulations (DNS). The DNS is performed with the spectral/hp element solver, Nektar++. Flow relaminarization and turbulence recovery were observed in the body-force-influenced flow when compared to the flow at the same Reynolds number. The interaction events assist the recovery at higher body forces and result in two peaks in the ratio of production to dissipation of turbulent kinetic energy. The spectra of velocity fluctuations are also analyzed which shows a drastic reduction in the energy and stretched tail in the dissipation range during the relaminarization which indicates the disappearance of streaky structures in the flow. A retrieval in the energy was observed as a result of turbulence recovery at low wave numbers. The strong scaling characteristics of the employed computational code shows a good scalability.

Date: 2021
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DOI: 10.1007/978-3-030-66792-4_27

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