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Proceedings of the 25th National and 3rd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2019)

ISBN Druckformat: 978-1-56700-497-7 (Flash Drive)
ISBN Online: 978-1-56700-496-0

APPLICATION OF THE K-KL MODEL TO ENGINEERING FLOWS

DOI: 10.1615/IHMTC-2019.1740
pages 1037-1042

Nived M. R.
Department of Mechanical and Aerospace Engineering, IIT Hyderabad

Nikhil Kalkote
Dept. of Mechanical and Aerospace Engg. IIT-Hyderabad, India 502285

Ashwani Assam
Department of Mechancial and Aerospace Engineering, IIT Hyderabad

Vinayak Eswaran
Department of Mechanical and Aerospace Engineering, IIT Hyderabad, Yeddumailaram-502 205, Andhra Pradesh, India

Abstrakt

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.