NDLI: A Hybrid RANS-LES Modeling Methodology Sensitized to Transitional and Curvature/Rotation Effects

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Chitta, Varun Walters, D. Keith
Copyright Year	2015
Abstract	This paper presents a new hybrid model that seeks to combine the strengths of Reynolds–averaged Navier-Stokes (RANS) and large eddy simulation (LES) methods. The new model is based on a recently proposed version of a dynamic hybrid RANS-LES (DHRL) framework that addresses several deficiencies inherent in most current hybrid models, including explicit grid dependence, boundary layer model stress depletion, and delayed shear layer breakdown. The DHRL framework is highly generalized, allowing coupling of any desired LES model with any given RANS model. In this study, a recently proposed four-equation eddy-viscosity model (EVM) capable of predicting both flow transition from laminar-to-turbulent (T) and rotation and/or streamline curvature (RC) effects is used for the RANS component, and a monotonically-integrated LES (MILES) scheme is used for the LES component. The new model (DHRL with T-RC effects) is implemented into a commercial computational fluid dynamics (CFD) code and investigated against three different flow configurations. The test cases include nonrotating and rotating channel flow, zero-pressure-gradient (ZPG) boundary layer flow over a flat plate, and flow over a circular cylinder. Results obtained from the numerical simulations indicate that the new hybrid model produces significant levels of turbulent fluctuations in the flowfield and successfully resolves T-RC effects. The results show improved accuracy compared to RANS models and are obtained at a significant reduction of computational cost compared to full LES models. Further investigation on complex test cases is warranted before commenting on the accuracy and potential usage of the model as a practical tool.
File Format	PDF
ISBN	9780791857465
DOI	10.1115/IMECE2015-53155
Volume Number	Volume 7A: Fluids Engineering Systems and Technologies
Conference Proceedings	ASME 2015 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2015-11-13
Publisher Place	Houston, Texas, USA
Access Restriction	Subscribed
Subject Keyword	Viscosity Turbulence Computational fluid dynamics Computer simulation Flat plates Modeling Rotation Flow (dynamics) Pressure Circular cylinders Stress Large eddy simulation Reynolds-averaged navier–stokes equations Eddies (fluid dynamics) Fluctuations (physics) Channel flow Shear (mechanics) Boundary layers
Content Type	Text
Resource Type	Article

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