Study of sensitivity of numerically simulated turbulent flow field to initial conditions

Milton, SG and Deshpande, MD (1996) Study of sensitivity of numerically simulated turbulent flow field to initial conditions. Technical Report. National Aerospace Laboratories, Bangalore, India.

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    Abstract

    Sensitivity of the numerically simulated flow field to the initial conditions has been checked by comparing the flows obtained by starting from different initial conditions. Flow in a three-dimensional cubical cavity driven by the motion of the lid is studied at two different Reynolds numbers Re=1,000 and Re=10,000. The two initial conditions used are ICI ; starting from rest and IC2 ; corresponding to the unsteady (turbulent) and hence comparison of the two fields obtained starting from IC1 and IC2 is not straight forward. Hence the convergence of the two fields was studied to see what kind of uncertainties exist. Then the mean velocity profiles, rms velocity profiles, and the shear stress profiles on selected lines and also turbulence spectra at a few points were compared. It was found that the two turbulence fields obtained starting from IC1 and IC2 were generally in qualitative agreement with one another. However, there are quantitative differences in the Reynolds shear stresses, which we believe show that much longer averaging times are required for these quantities to settle down.

    Item Type: Proj.Doc/Technical Report (Technical Report)
    Uncontrolled Keywords: Turbulence;Direct numerical simulation;Driven cavity;Initial conditions
    Subjects: AERONAUTICS > Aeronautics (General)
    Division/Department: Other, Computational and Theoretical Fluid Dynamics Division
    Depositing User: M/S ICAST NAL
    Date Deposited: 08 May 2009
    Last Modified: 17 Jun 2010 14:59
    URI: http://nal-ir.nal.res.in/id/eprint/5092

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