Implicit unfactored implementation of two-equation turbulence models in compressible Navier-Stokes methods

Barakos, G. and Drikakis, D. (1998) Implicit unfactored implementation of two-equation turbulence models in compressible Navier-Stokes methods. International Journal for Numerical Methods in Fluids, 28(1), pp. 73-94. (doi:10.1002/(SICI)1097-0363(19980715)28:1<73::AID-FLD700>3.0.CO;2-R)

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Abstract

Abstract An implicit unfactored method for the coupled solution of the compressible Navier–Stokes equations with two-equation turbulence models is presented. Both fluid-flow and turbulence transport equations are discretized by a characteristics-based scheme. The implicit unfactored method combines Newton subiterations and point-by-point Gauss–Seidel subrelaxation. Implicit-coupled and -decoupled strategies are compared for their efficiency in the solution of the Navier–Stokes equations in conjunction with low-Re two-equation turbulence models. Computations have been carried out for the flow over an axisymmetric bump using the k–ϵ and k–ω models. Comparisons have been obtained with experimental data and other numerical solutions. The present study reveals that the implicit unfactored implementation of the two-equation turbulence models reduces the computing time and improves the robustness of the CFD code in turbulent compressible flows.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Barakos, Professor George
Authors: Barakos, G., and Drikakis, D.
College/School:College of Science and Engineering > School of Engineering > Aerospace Sciences
Journal Name:International Journal for Numerical Methods in Fluids
Publisher:Wiley
ISSN:0271-2091
ISSN (Online):1097-0363

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