Topical Problems of Fluid Mechanics


Institute of Thermomechanics AS CR, v.v.i.	CTU in Prague Faculty of Mech. Engineering Dept. Tech. Mathematics	MIO Université du Sud Toulon Var - AMU - CNRS - IRD	Czech Pilot centre ERCOFTAC

Towards Pressure Gradient Sensitive Transitional k-kL-ω Model: The Natural Transition for Low Re Airfoils
Fürst J., Islam M., Příhoda J., Wood D.
Abstract:
The work deals with the development of a pressure gradient sensitive variant of a three-equation RANS model for turbulent and transitional flows. The model is based on the laminar kinetic energy approach by Walters and Cokljat [1]. The revisited model [2] was successfully validated for zero or mild pressure gradient flows with the so-called bypass transition (see e.g. [2]). In the case of natural transition in adverse pressure gradient flows the model usually tends to predict the transition too late, see [3], [4], [5]. The aim of present work is to improve the model for the case of flows with very low free-stream turbulence levels with adverse pressure gradient. As a first step we focus the attention to the onset of linear instability.
Keywords:
turbulence, laminar-turbulent transition, laminar kinetic energy

Fulltext: PDF DOI: No Doi

In Proceedings Topical Problems of Fluid Mechanics 2015, Prague, 2015 Edited by David Šimurda and Tomáš Bodnár, pp. 65-70 ISBN 978-80-87012-55-0 (Print) ISSN 2336-5781 (Print)