Nived M. R.
Department of Mechanical and Aerospace Engineering, IIT Hyderabad
Dept. of Mechanical and Aerospace Engg.
IIT-Hyderabad, India 502285
Department of Mechancial and Aerospace Engineering, IIT Hyderabad
Department of Mechanical and Aerospace Engineering, IIT Hyderabad, Yeddumailaram-502 205, Andhra Pradesh, India
Two-equation linear eddy-viscosity models are quite popular
in the engineering community. These models are generally
based on simplified empirical correlations of theoretical concepts, such as homogeneous turbulence, pressure-gradient and
high/low Reynolds number flow. The direct consequence of these
assumptions is that a given model will work only for a few types of flows. For example, the k−ε model does not perform well in the near-wall regime as it works in case of free-shear flows. The robustness of a model is often improved by blending two models, one which works well in the near-wall regime and other in free-shear flows. Hence, there is a need for a reliable and versatile model which works satisfactorily for most types of flows encountered
in engineering applications. In this article, we present
the applicability of the k−kL model for engineering flows. The model has been implemented in an in-house unstructured grid solver. The results are promising and show that the model can predict a wide variety of engineering flows with reasonable accuracy. The test cases being considered are aerodynamic flows with and without pressure gradient, jets, and free-shear flows.