Improved form of the low Reynolds number k−ε turbulence model

The behavior of the k−ε turbulence model at a turbulent/nonturbulent interface is examined to determine the turbulent diffusion coefficients σk and σε. The analysis leads to a dilemma caused by the modeling of the generation term in the k and ε equations. Based on limiting values of σk and σε derived from this analysis, a revised form of the low−Reynolds−number incompressible k−ε turbulence model is presented which incorporates a new set of model constants, a linear form of the near wall dissipation term in the k equation, and deletion of a nonphysical term in the ε equation. The revised model is applied to fully developed flow in a channel and found to give better agreement with experiment than the original form of the model developed by Jones and Launder.