Bluff body asymmetric flow phenomenon-real effect or solver artefact?

Tanya Prevezer , Jeremy Holding , Adrian Gaylard , Robert Palin(U.K.)

Abstract

This paper describes a CFD investigation into the flow over the cab of a bluff-fronted lorry.rnSeveral different simulations were undertaken, using the commercial codes: CFX, Fluent and PowerFLOW.rnUsing the k - e turbulence model, the flow over the cab was symmetric, however, using more accuraternturbulence models such as the RNG k - e model or the Reynolds Stress Model, the flow was asymmetric.rnThe paper discusses whether this phenomenon is a real effect or whether it is a solver artefact and thernstudy is supported by experimental evidence. The findings are preliminary, but suggest that it has arnphysical origin and that it may be aspect ratio-dependent.

Key Words

CFD; CFX; PowerFLOW; asymmetry; turbulence model; aspect ratio; unstable; bluff.

Address

Tanya Prevezer and Jeremy Holding, Aerodynamics Team, AEA Technology Rail, rtc Business Park, London Road, Derby, DE24 8YB, UKrnAdrian Gaylard and Robert Palin, Fluids Group, MIRA, Watling Street, Nuneaton, UK

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