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

G. Barakos, D. Drikakis

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Pages (from-to)73-94
Number of pages22
JournalInternational Journal for Numerical Methods in Fluids
Volume28
Issue number1
DOIs
Publication statusPublished - 15 Jul 1998
Externally publishedYes

Fingerprint

Dive into the research topics of 'Implicit unfactored implementation of two-equation turbulence models in compressible Navier-Stokes methods'. Together they form a unique fingerprint.

Cite this