期刊论文详细信息
Journal of Marine Science and Engineering
An Explicit Algebraic Closure for Passive Scalar-Flux: Applications in Channel Flows at a Wide Range of Reynolds Numbers
FotosS. Stylianou1  Constantine Michailides2  Evangelos Akylas3  Elias Gravanis3  ConstantinosF. Panagiotou3 
[1] Computational Sciences Laboratory, UCY-CompSci, Department of Mechanical & Manufacturing Engineering, University of Cyprus, 2109 Nicosia, Cyprus;Department of Civil Engineering & Geomatics, Cyprus University of Technology, 3036 Limassol, Cyprus;Eratosthenes Centre of Excellence, Cyprus University of Technology, 3036 Limassol, Cyprus;
关键词: scalar-flux;    RANS;    algebraic model;    channel flows;    high Reynolds numbers;   
DOI  :  10.3390/jmse8110916
来源: DOAJ
【 摘 要 】

In this paper, we propose an algebraic model for turbulent scalar-flux vector that stems from tensor representation theory. The resulting closure contains direct dependence on mean velocity gradients and quadratic products of the Reynolds stress tensor. Model coefficients are determined from Direct Numerical Simulations (DNS) data of homogeneous shear flows subjected to arbitrary mean scalar gradient orientations, while a correction function was applied at one model coefficient based on a turbulent channel flow case. Model performance is evaluated in Poiseuille and Couette flows at several Reynolds numbers for Pr=0.7, along with a case at a higher Prandtl number (Pr=7.0) that typically occurs in water–boundary interaction applications. Overall, the proposed model provides promising results for wide near-wall interaction applications. To put the performance of the proposed model into context, we compare with Younis algebraic model, which is known to provide reasonable predictions for several engineering flows.

【 授权许可】

Unknown   

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