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Article
Explicit algebraic models for stratified flows
| Authors: |
Lazeroms, W.M.J., Brethouwer, G.B., Wallin, S.W., Johansson, A.V.J. |
| Document Type: |
Conference |
| Pubstate: |
Published |
| Journal: |
Proc 9th Int. ERCOFTAC Symposium on Engineering Turbulence Modeling and Measurements (ETMM9), Thessaloniki, Greece, Jun. 6-8 (2012) |
| Volume: |
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| Year: |
2012 |
AbstractAn explicit algebraic Reynolds stress and scalar flux model for stratified turbulent flows is formed from a coupled set of algebraic equations for the Reynolds stress anisotropy and the scaled scalar flux. The complete model is derived for two-dimensional mean flows, and evaluated for two test cases: turbulent channel flow and homogeneous shear flow, both with stable stratification. The channel flow results are compared with DNS data, and show a good agreement in the mean profiles, the Reynolds stress and the wall-normal scalar flux. The homogeneous shear flow case results in a critical gradient Richardson number close to 0.25. The derived model can thus correctly capture the effect of stable stratification on a turbulent shear flow.
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