Boundary, Region, And Initial Conditions
Transcript of Boundary, Region, And Initial Conditions
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Boundary, Region, and InitialConditions
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Modeling Physics > Modeling Turbulence and Transition > Using K-Epsilon Turbulence > K-Epsilon Turbulence Formulation > Boundary, Region, and Initial Conditions
Boundary, Region, and Initial Conditions
Wall Boundaries
At walls, a Neumann boundary condition is used for the turbulent kinetic energy , that is, . The turbulent dissipation rate is specified in the wall cells according to the appropriate method in the wall
treatment.
Flow, Region, and Initial Conditions
When defining values for flow boundary, region and initial conditions, you have several choices for specifying the turbulent kinetic energy and turbulent dissipation rate:
Enter the values directly.
Have them derived from a specified turbulence intensity ( ) and length scale ( ) using the relations:
(563)
where v is the local velocity magnitude and is a coefficient of the model.
Have them derived from a specified turbulence intensity ( ) and turbulent viscosity ratio using the relations:
(564)
where v is the local velocity magnitude and is a coefficient of the model.
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