# K-epsilon models

### From CFD-Wiki

(Difference between revisions)

Littleandy (Talk | contribs) |
Littleandy (Talk | contribs) |
||

Line 1: | Line 1: | ||

+ | == Introduction == | ||

+ | |||

+ | The K-epsilon model is one of the most common [[Turbulence modeling|turbulence models]]. It is a [[Two equation models|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]], <math>k</math>. The second transported variable in this case is the turbulent [[dissipation]], <math>\epsilon</math>. It is the variable that determines the scale of the turbulence, whereas the first variable, <math>k</math>, determines the energy in the turbulence. | ||

+ | |||

+ | == Usual K-epsilon models == | ||

# [[Standard k-epsilon model]] | # [[Standard k-epsilon model]] | ||

# [[Realisable k-epsilon model]] | # [[Realisable k-epsilon model]] | ||

# [[RNG k-epsilon model]] | # [[RNG k-epsilon model]] | ||

+ | |||

+ | == Miscellaneous == | ||

+ | # [[Near-wall treatment for k-epsilon models]] | ||

+ | |||

+ | |||

+ | [[Category: Turbulence models]] |

## Revision as of 07:09, 4 October 2006

## 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, . The second transported variable in this case is the turbulent dissipation, . It is the variable that determines the scale of the turbulence, whereas the first variable, , determines the energy in the turbulence.