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Modeling Geometry

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Modeling Turbulence and Transition

Selecting a Turbulence ModelingApproach

Selecting a Transition ModelingApproach

Using Reynolds-Averaged Navier-Stokes Turbulence Models

Using Large Eddy Simulation

Using Detached Eddy Simulation

Using the Synthetic Eddy Methodfor Initialization and Inflow

Using Wall Treatment Models

Using Spalart-Allmaras Turbulence

Using K-Epsilon Turbulence

What Are the K-EpsilonTurbulence Models?

What Are the Non-LinearConstitutive Relations?

Exposing Reynolds Stresses forStandard Non-Linear K-EpsilonModels

What Is the K-Epsilon C3eCoefficient?

What Is the RealizabilityCoefficient?

How Do I Choose a K-EpsilonModel and Wall Treatment?

Understanding the K-EpsilonWall Treatment

Working with K-Epsilon Solvers

K-Epsilon TurbulenceFormulation

Standard K-Epsilon Model

Realizable K-Epsilon Model

Standard (Lien) Low-ReynoldsNumber K-Epsilon Model

Abe-Kondoh-NaganoLow-Reynolds NumberK-Epsilon Model

V2F Low-Reynolds NumberModel

Nonlinear Constitutive Relations

Two-Layer Formulation

Wall Treatment

Boundary, Region, and InitialConditions

K-Epsilon TurbulenceNomenclature

K-Epsilon TurbulenceBibliography

Region, Boundary, and PhaseTypes Reference

Shared Conditions Reference

Regions, Boundary, and PhaseConditions and Values Reference

K-Epsilon Turbulence FieldFunctions Reference

Using K-Omega Turbulence

Using Reynolds Stress TransportTurbulence

Using Smagorinsky Subgrid ScaleTurbulence

Using Dynamic SmagorinskySubgrid Scale Turbulence

Using WALE Subgrid ScaleTurbulence

Using the Turbulence SuppressionModel

Using the Gamma ReThetaTransition Model

Modeling Turbulent Heat Flux

Shared Conditions and ValuesReference

Turbulence Field Functions Reference

Modeling Radiation

Modeling Aeroacoustics

Modeling Combustion

Modeling Multiphase Flow

Modeling Dynamic Fluid BodyInteraction

Modeling with Harmonic Balance

Modeling Solid Stress

Modeling Electromagnetism

Modeling Electrochemistry

Modeling Batteries

Modeling Casting

Modeling Region Sources

Remedying Cell Quality

Controlling Domain Decomposition

Solving Transport Equation

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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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