Study of Two-Equation Based Modelling for Compressible, Turbulent Flows

Effects of compressibility and chemical reaction on the turbulence structure are two important but difficult issues in turbulence modelling. Several proposed treatments dealing with the dilatation dissipation and the pressure dilatation correlation are discussed in the context of the two-equation model. Also, two new modifications are proposed to account for extra terms that appearfor compressible flows. An attempt is made to validate and calibrate these modifications against experimental data for supersonic flow over an axi-symmetric afterbody. These compressibility modifications are also tested for certain simple reacting flows in order to estimate their predictive capabilities. Additionally, proposed modifications to account for the imbalance between the production of turbulent kinetic energy and its rate of dissipation are contrasted against the standard modelling procedure.

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