Code development and validation of rans solvers for flows around bluff bodies

Saud Khashan, Abdullatif M. Alteraifi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A steady state simulation for the flow past a circular cylinder at the sub-critical Reynolds number of 3900 is conducted using a variety of non-linear eddy viscosity-based two-equation κ-ε models. Although, this simulation compromises the transient characteristics of the flow, the solution obtained using a steady state simulation showed qualitative relevance. Steady state results were closely comparable to the far more expensive and supposedly more correct time-averaged solutions obtained using transient simulations. The dissipative effect due to such turbulence modeling by far overweighs the effect of the numerical dissipation. Such dissipation dampened the intrinsic self-excited unsteadiness known to exist in such flow and enabled steady state-like solution. In-house developed finite volume based code along with a commercial finite-element code, were used. Qualitative agreement is attainable for the surface-pressure distribution over the cylinder and the centerline streamwise velocity in the wake regions. For this type of problems, the time-averaged solutions obtained using transient simulation that employs the non-linear eddy viscosity-based two-equation κ-ε type models, offered marginal improvement over those obtained using steady state simulations.

Original languageEnglish
Title of host publicationFluids Engineering
PublisherAmerican Society of Mechanical Engineers (ASME)
Pages765-772
Number of pages8
ISBN (Print)0791836576, 9780791836576
DOIs
Publication statusPublished - 2002

Publication series

NameASME International Mechanical Engineering Congress and Exposition, Proceedings

Keywords

  • CFD
  • Cylinder
  • Models
  • Separated flow
  • Turbulence
  • κ-ε

ASJC Scopus subject areas

  • Mechanical Engineering

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