Turbulence modeling for CFD, part 2

Majumdar, Sekhar (1994) Turbulence modeling for CFD, part 2. In: CFD: Advances and Applications, 1994, India.

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This part of the lecture first explains the limitations of the Boussinesq Eddy Viscosity hypothesis which forms the basis of all the algebraic and transport equation-based models discussed in Part 1. Unlike laminar viscosity, the eddy viscosity is affected by the shape and nature of the solid boundaries, freestream turbulence intensity and most significantly by the flow history effects. The linear stress-strain relationship is therefore not likely to predict a satisfactory description of a complex turbulent flow situation. Two basic approaches to remove the limitations of the Boussinesq approximation are to use either a Nonlinear Constitutive Relation or a Second Moment Closure based Model. These modeling techniques expected to provide more accurate prediction of complex flows are presented in Sections 2 and 3. Section 4 addresses some important issues in constructing turbulence models for application to compressible flows. A few examples on application of second moment closure and models for compressible flows are demonstrated in Section 5, followed by some concluding remarks

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Boundary conditions;Boussinesq approximation;Computational fluid dynamics;Eddy Viscosity;Turbulence models;Turbulent flow;Compressible flow;Transport properties;Turbulence
Subjects: ENGINEERING > Fluid Mechanics and Thermodynamics
Depositing User: Mrs Manoranjitha M D
Date Deposited: 23 Oct 2006
Last Modified: 24 May 2010 04:22
URI: http://nal-ir.nal.res.in/id/eprint/3158

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