Large eddy simulation of a forward-backward facing step for acoustic source identification

Y. Addad, D. Laurence, C. Talotte, M. C. Jacob

    Research output: Contribution to journalArticlepeer-review

    56 Scopus citations

    Abstract

    The feasibility of using a commercial CFD code for large eddy simulation (LES) is investigated. A first test on homogeneous turbulence decay allows a fine-tuning of the eddy viscosity with respect to the numerical features of the code. Then, a flow over forward-backward facing step at Reynolds number Reh = 1.7 × 105 is computed. The results found show good agreement with the new LDA data of Leclercq et al. [Forward backward facing step pair: aerodynamic flow, wall pressure and acoustic characterization. AIAA-2001-2249]. The acoustic source term, recorded from the LES and to be fed into a following acoustic propagation simulation, is found to be largest in the separation from the forward step. The source terms structures are similar to the vortical structures generated at the front edge of the obstacle and advected downstream. Structures generated from the backward step rapidly break down into smaller scale structures due to the background turbulence.

    Original languageBritish English
    Pages (from-to)562-571
    Number of pages10
    JournalInternational Journal of Heat and Fluid Flow
    Volume24
    Issue number4
    DOIs
    StatePublished - Aug 2003

    Keywords

    • Acoustics
    • Bluff body aerodynamics
    • Finite volume method
    • LES
    • Separated flows

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