Assessment of hybrid RANS-LES methods for accurate automotive aerodynamic simulations
نویسندگان
چکیده
منابع مشابه
Realizable Uni ed RANS-LES and Dynamic LES Methods for Turbulent Flow Simulations
Existing LES methods face three basic problems: a huge variety of LES models are currently applied, dynamic LES methods are either very expensive or have to be combined with ow-dependent empirical stabilization techniques, and the cost of LES for wall-bounded ow simulations are way too high for most applications. Solutions for these three problems can be developed by deriving non-dynamic, dynam...
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Ideally, a hybrid LES-RANS computation would employ LES only where necessary to make up for the failure of the RANS model to provide sufficient accuracy or to provide time-dependent information. Current approaches are fairly restrictive in the placement of LES and RANS regions; an LES-RANS transition in a boundary layer, for example, yields an unphysical log-layer shift. A hybrid computation is...
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Hybrid acoustic prediction methods have an important advantage over the current Reynolds averaged Navier-Stokes (RANS) based methods in that they only involve modeling of the relatively universal subscale motion and not the configuration dependent larger scale turbulence. Unfortunately, they are unable to account for the high frequency sound generated by the turbulence in the initial mixing lay...
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The objective of this study is to evaluate a recently proposed dynamic hybrid Reynoldsaveraged Navier-Stokes (RANS)-Large Eddy Simulation (LES) modeling framework that seeks to effectively address issues regarding RANS-to-LES transition and explicit grid dependence inherent in most current hybrid RANS-LES (HRL) models. RANSto-LES transition in the investigated dynamic HRL (DHRL) model is based ...
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ژورنال
عنوان ژورنال: Journal of Wind Engineering and Industrial Aerodynamics
سال: 2020
ISSN: 0167-6105
DOI: 10.1016/j.jweia.2020.104301