Unsteady flow computations for flow past multiple moving boundaries

Ramesh, V and Deshpande, SM (2006) Unsteady flow computations for flow past multiple moving boundaries. Technical Report. National Aerospace Laboratories, Bangalore, India.

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    Abstract

    We present the latest developments in the Least Squares Kinetic Upwind Method (LSKUM) a kinetic theory based grid free approach for the solution of Euler equations.13; A single step higher order scheme through Modified CIR splitting is presented A new weighted least squares method has been used in the present work which simplifies the 2-D formulae to an equivalent 1-D form. This is achieved through digitalization of the least squares matrix through suitable choices of the weights. All these developments have been extended to problems with moving nodes and boundaries. A 2-D unsteady Euler code has been developed incorporating all the above ideas along; with the well known dual time stepping procedure. The code has been verified and validated for the standard test case AGARD CT(5) which corresponds to unsteady flow past oscillating NAC AGO 12 airfoil pitching about quarter chord. Good comparisons with the experimental values have been obtained in order to demonstrate the ability of the method to handle multiple moving bodies we have computed unsteady flow past two oscillating NACA0012 airfoils one behind the other. Some interesting results are presented for this case.

    Item Type: Proj.Doc/Technical Report (Technical Report)
    Uncontrolled Keywords: Gridless kinetic upwind scheme;Unsteady flows;Modified CIR splitting;Eigenvector based weights;Dual time stepping
    Subjects: ENGINEERING > Fluid Mechanics and Thermodynamics
    Division/Department: Computational and Theoretical Fluid Dynamics Division, Computational and Theoretical Fluid Dynamics Division
    Depositing User: Mrs Manoranjitha M D
    Date Deposited: 16 Jan 2009
    Last Modified: 24 May 2010 09:50
    URI: http://nal-ir.nal.res.in/id/eprint/2615

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