# K-epsilon models

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 Revision as of 09:14, 15 May 2008 (view source) (→Introduction)← Older edit Revision as of 09:14, 15 May 2008 (view source) (→Introduction)Newer edit → Line 6: Line 6: The first transported variable is turbulent kinetic energy, $k$.  The second transported variable in this case is the turbulent dissipation, $\epsilon$. It is the variable that determines the scale of the turbulence, whereas the first variable, $k$, determines the energy in the turbulence. The first transported variable is turbulent kinetic energy, $k$.  The second transported variable in this case is the turbulent dissipation, $\epsilon$. It is the variable that determines the scale of the turbulence, whereas the first variable, $k$, determines the energy in the turbulence. - To calculate boundary conditions for a calculation using this model see [[Turbulence free-stream boundary conditions|turbulence free-stream boundary conditions]]. + To calculate boundary conditions for a calculation using these models see [[Turbulence free-stream boundary conditions|turbulence free-stream boundary conditions]]. == Usual K-epsilon models == == Usual K-epsilon models ==

## Introduction

The K-epsilon model is one of the most common turbulence models. It is a two equation model, that means, it includes two extra transport equations to represent the turbulent properties of the flow. This allows a two equation model to account for history effects like convection and diffusion of turbulent energy.

The first transported variable is turbulent kinetic energy, $k$. The second transported variable in this case is the turbulent dissipation, $\epsilon$. It is the variable that determines the scale of the turbulence, whereas the first variable, $k$, determines the energy in the turbulence.

To calculate boundary conditions for a calculation using these models see turbulence free-stream boundary conditions.

## Miscellaneous

1. Near-wall treatment for k-epsilon models