Influence of spatial discretization schemes on accuracy of explicit LES: Canonical problems to engine-like geometries
| Autor: | J. Martínez, Federico Piscaglia, S. M. Aithal, Angelo Onorati, A. Montorfano |
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| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Mathematical optimization
Work (thermodynamics) General Computer Science Discretization Turbulence Advection business.industry Engine LES OpenFOAM Sigma Computer Science (all) Engineering (all) General Engineering Experimental data Computational fluid dynamics Term (time) Physics::Fluid Dynamics Code (cryptography) Applied mathematics business Mathematics |
| Popis: | The choice of the spatial discretization scheme and the subgrid-scale (SGS) model can have a significant impact on the accuracy of Large Eddy Simulations (LES). A systematic study of the influence of the advection term discretization scheme, namely ( CDS , LUST ) and the SGS model ( σ -model, WALE and dynamic Smagorinsky) on the accuracy of the solution is presented in this work. Three canonical cases with increasing complexity are considered in this study, namely, a fully developed turbulent channel flow with Re τ = 395 , a backward facing step and a wall-mounted hump. Mean errors with respect to DNS or experimental data are quantified in order to compare the relative accuracy of each combination of scheme/model. Detailed comparison of the numerical simulations performed by the open-source CFD code OpenFOAM® shows that the σ -model with the LUST discretization scheme yields the best results. This combination of σ -model with LUST discretization scheme has hence been used to study the turbulent flow characteristics in an engine-like geometry. Results show good agreement with experimental data. |
| Databáze: | OpenAIRE |
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