Modelling the effect of flow pulsation on turbulen flow in a 10-deg plane diffuser.

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


    Flows involving detachment and reattachment are found in a range of engineering systems such as vehicles and planes. The 10o diffuser flow considered here sees grad- ual change in the mean flow, which makes it challenging to model. The separation point here is not geometrically fixed, so the effect of separation control can then be investigated for both the flow detachment and reattachment processes. The subject of this investigation is the response of the flow to the imposed unsteadiness arising from a periodic injection / suction upstream of the reattachment point. The test case examined is that studied experimentally by Masuda et al.1 shown in Figure 1. There are considerable modelling challenges in computing flows exhibiting even steady detachment and reattachment. In order to minimiz computing times there is a desire to employ relatively simple RANS models of turbulence. However, simple linear eddy- viscosity models are known to perform badly in separate flows, and even non-linear eddy- viscosity models do not all produce accurate and reliable results. In a recent study, Craft et al.2 introduced refinements to a non-linear eddy-viscosity model and showed that this performed quite successfully in predicting the steady flow and heat transfer through a sudden pipe expansion. The present work tests the two-equation linear k − epsilin schemes, and the modified two-equation non-linear model.
    Original languageEnglish
    Title of host publicationEuromech Fluid Mechanics Conference
    Publication statusPublished - 14 Sept 2008
    EventEuromech Fluid Mechanics Conference - Manchester
    Duration: 14 Sept 200814 Sept 2008


    ConferenceEuromech Fluid Mechanics Conference
    Internet address


    • Flow Pulsation
    • 2-D Diffuser
    • Non-Linear Effective-Viscosity Model
    • Unsteady RANS


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