V2-f models

From CFD-Wiki

Revision as of 12:09, 4 October 2006 by Littleandy (Talk | contribs)

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

Introduction

The $v^2-f$ model is similar to the Standard k-epsilon model. Additionally, it incorporates also some near-wall turbulence anisotropy as well as non-local pressure-strain effects. It is a general turbulence model for low Reynolds-numbers, that does not need to make use of wall functions because it is valid upto solid walls. The $v^2-f$ model uses a velocity scale, $\overline {v^2}$ , instead of turbulent kinetic energy, $k$ , for the evaluation of the eddy viscosity. $\overline {v^2}$ can be thought of as the velocity fluctuation normal to the streamlines. It can provide the right scaling for the representation of the damping of turbulent transport close to the wall.