A new near-wall formulation for the kappa-epsilon equations of turbulence
Abstract
A new method for solving the kinetic energy and dissipation across the viscous sublayer in turbulent flows is introduced. The approach uses either the law of the wall separation or the linear law to specify values for kinetic energy and dissipation at the first point outside the viscous sublayer. These values are then used as boundary conditions for the kappa-epsilon equations in the fully turbulent region. Within the viscous sublayer, algebraic relations for kinetic energy and dissipation are used. These relations, coupled with a new equation for eddy viscosity within the viscous sublayer, can produce reasonable values for the kinetic energy and dissipation for any number of mesh points inside the viscous sublayer. By allowing any number of grid points to lie within the viscous sublayer, this method provides distinct advantages over present techniques, which are very grid-dependent.
- Publication:
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24th AIAA Aerospace Sciences Meeting
- Pub Date:
- January 1986
- Bibcode:
- 1986aiaa.meetZ....G
- Keywords:
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- Computational Fluid Dynamics;
- Energy Dissipation;
- K-Epsilon Turbulence Model;
- Kinetic Energy;
- Turbulent Boundary Layer;
- Viscous Flow;
- Wall Flow;
- Computational Grids;
- Eddy Viscosity;
- Flat Plates;
- High Reynolds Number;
- Supersonic Flow;
- Fluid Mechanics and Heat Transfer