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THMT-18. Turbulence Heat and Mass Transfer 9 Proceedings of the Ninth International Symposium On Turbulence Heat and Mass Transfer
July, 10-13, 2018, Rio de Janeiro, Brazil

DOI: 10.1615/THMT-18


ISBN Print: 978-1-56700-468-7

ISBN Online: 978-1-56700-467-0

ISSN Print: 2377-2816

Roughness corrections for turbulence models: low-Reynolds and wall function approaches

pages 471-482
DOI: 10.1615/THMT-18.470
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RESUMO

Based on the equivalent sand grain roughness concept, a low-Reynolds number and a wall function approaches were derived to account for roughness effects. The same principle consisting in the increase of the eddy viscosity at the wall to artificially increase the wall friction was used to build the two models. The two approaches were introduced into a Navier-Stokes solver and compared against measurements. In particular, beyond the good prevision of the friction increase due to roughness, the proposed models are able to account for the wetted surface effect on heat transfers.

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