NDLI: Anisotropic Turbulence Modelling of Near Wall Effects Pertinent to Turbomachinery Flows

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Corsini, Alessandro Rispoli, Franco
Copyright Year	2002
Abstract	A computational study is presented which investigates the predictive performance of two non-linear turbulence closures in simulating the physics pertinent to decelerating turbomachinery flows. The compared approaches are a cubic non-linear k-ε model and an algebraic Reynolds stress model. They have been considered as promising closures for improving the industry CFD state-of-the-art accounting for non-equilibrium effects. The authors adopt a parallel multi-grid algorithm, which is developed with a finite element formulation based on a highly accurate stabilized Petrov-Galerkin method. The finite element formulation is here applied on equal-order Q1-Q1 as well as mixed Q2-Q1 element pairs, and the accuracy of the latter approximation is assessed on near-wall flows simulation. The parallel solution algorithm for Reynolds Averaged Navier-Stokes modeling exploits an overlapping domain decomposition technique based on an “inexact explicit non linear Schwarz method”. The compressor flow considered for model benchmarking is highly challenging because of the transitional nature of the flow and the existence of significant leading- and trailing-edge separations. The potential of non-isotropic closures has been investigated. The algebraic stress model is shown to provide a better base-line for non-equilibrium effects simulation with respect to the cubic k-ε model. As it is shown for the studied compressor cascade, the cubic eddy-viscosity model exhibits some predictive weaknesses, among them an excessive turbulence attenuation that results in un-realistically delayed transition to turbulence.
Sponsorship	Fluids Engineering Division
Starting Page	963
Ending Page	972
Page Count	10
File Format	PDF
ISBN	0791836169
DOI	10.1115/FEDSM2002-31206
e-ISBN	0791836002
Volume Number	Volume 2: Symposia and General Papers, Parts A and B
Conference Proceedings	ASME 2002 Joint U.S.-European Fluids Engineering Division Conference
Language	English
Publisher Date	2002-07-14
Publisher Place	Montreal, Quebec, Canada
Access Restriction	Subscribed
Subject Keyword	Viscosity Turbulence Approximation Computational fluid dynamics Accounting Cascades (fluid dynamics) Equilibrium (physics) Turbomachinery Compressors Flow (dynamics) Modeling Stress Physics Algebra Algorithms Simulation Anisotropy Eddies (fluid dynamics) Finite element analysis
Content Type	Text
Resource Type	Article

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