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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

Physics underlying Realizability Constraints

pages 371-374
DOI: 10.1615/THMT-18.350
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ABSTRAKT

Realizability is an important mathematical constraint on turbulence closure models. It arises from the requirement that the turbulence processes implied by statistical closure models must be physically feasible. The realizability constraint can be imposed at various levels of turbulence closure. In this paper, we will compare the different formulations of realizability constraints. The realizability of Boussinesq constitutive model will be discussed in detail. At this level, the constraint arises due to the positive semi-definite nature of the Reynolds stress tensor. The flow physics underlying realizability constraints at two-equation level of closure is addressed.

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