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  • [June 22, 2017]

    A Self-Contained Filtered Density Function for Large Eddy Simulation of Turbulent Flow

  • Speaker:
    Peyman Givi
    Date:
    Thursday, June 22, 2017
    Time:
    2:30-3:30pm
    Location:
    Room 212, COE Building No.1
    Host:
    Jianping Wang
  • Abstract
  • The filtered density function (FDF) and its density weighted filtered mass density function (FMDF) have proven very effective for large eddy simulation (LES) of turbulent flows. The most sophisticated form of the model to-date is the joint frequency-velocity-scalar filtered mass density function (FVS-FMDF) and a simpler version (VS-FMDF) which does not include the subgrid scale (SGS) frequency. Hydro dynamic closure in incompressible, non-reacting flows has been achieved via the marginal velocity-FDF (V-FDF), and the one which considers only the species mass fraction field is the scalar-FDF (S-FDF and S- FMDF). The latter is the most elementary form of FDF and is currently the most widely used. The extension to include for exergy analysis is via Entropy FDF (En-FDF).
    In almost all of the previous work, the FDF is considered for flows at low compressibility levels. In such flows, the effects of pressure fluctuations in the energy transport is negligible. In the present work, the FDF is extended to a “self-contained” format to include the SGS statistics of all of the hydro-thermo-chemical variables. These are the thermodynamic pressure, the specific internal energy, the velocity vector and the composition field. A transport equation is developed for the joint “pressure-energy-velocity-composition filtered mass density function” (PEVC- FMDF). In this equation, the effect of convection appears in a closed form. The coupling of the hydrodynamics and thermodynamics (and chemistry in reacting flows) is modeled. The consistency of the PEVC-FMDF formulation is established, and the overall predictive capability of the model is appraised via comparison with direct numerical simulation (DNS) data.

  • Biography
  • Dr. Peyman Givi is Distinguished Professor, the James T MacLeod Professor of Mechanical Engineering, and Professor of Petroleum Engineering at the University of Pittsburgh. Previously he held the position of UB Distinguished Professor of Aerospace Engineering at the SUNY-Buffalo.  He has also worked as a Research Scientist at Flow Research Company (Kent, WA), and has had visiting appointments at the NASA Langley and Glenn (Lewis) centers. He is Deputy Editor of AIAA Journal and on editorial boards of several other journals including Computer and Fluids and Journal of Applied Fluid Mechanics. He is Fellow of AAAS, AIAA, APS and ASME. PhD from Carnegie Mellon and BE from Youngstown State University (Ohio). He has four children: Regina, Carmen, Julian and Jerome.