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THMT-12. Proceedings of the Seventh International Symposium On Turbulence Heat and Mass Transfer
September, 24-27, 2012, Palermo, Italy

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal


ISBN Print: 978-1-56700-302-4

ISSN: 2377-2816

Analysis of DNS and RANS data in a turbulent channel flow with surface mounted ribs

pages 494-505
DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.550
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Turbulent channel flow with surface mounted ribs on both sides of the channel was investigated by means of DNS and RANS simulations. The ribs are of square cross-section of size r = 0.1h (h being the channel half-width) and a streamwise pitch of 8r. The bulk Reynolds number was 5056. The present DNS revealed that large pockets of intense streamwise velocity fluctuations, and the occurrence of quasi-streamwise coherent streaks, were responsible for the higher turbulence levels in the shear-layers behind the ribs. In addition, the local skin-friction coefficient in the DNS indicated that the separated flow behind a rib does not re-attach on to the wall. On comparing the present DNS and RANS results, it was apparent that the standard k − ε model overpredicted the turbulent kinetic energy by a notable margin. On the contrary, the results from RNG and realizable k − ε models were in reasonably good agreement with the DNS.

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