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

CFD Analysis Around Ahmed Body Using a Laminar Kinetic Energy Based Transition and Turbulence Model
F. Aqilah, M. Islam, J. Fürst, F. Juretić
Abstract:
Due to numerous reasons, improving the fuel e ciency has become a very important topic for research nowadays. One of the ways to improve fuel e ciency is to reduce the drag forces encountered by moving bodies. For prediction of drag forces, diversified approaches can be undertaken. CFD simulations provide these, but their accuracy is very dependent on the modeling of transition e ects in the turbulence model. In the present study, a simple shape (called Ahmed Body) has been investigated using an open source CFD software called OpenFOAM. Two different classes of turbulence models (namely k-ω SST and k-kL-ω) have been used and the obtained results are validated against experimental data. Efforts have also been made in the present research to analyze the vortices in the wake region of the Ahmed Body using selected visualization techniques such as surface line-integral convolution, Q-criterion, and λ₂-criterion.
Keywords:
Ahmed body, Transition turbulence model, k-kL-ω, k-ω SST, OpenFOAM, Vortex visualization

Fulltext: PDF DOI: https://doi.org/10.14311/TPFM.2019.001

In Proceedings Topical Problems of Fluid Mechanics 2019, Prague, 2019 Edited by David Šimurda and Tomáš Bodnár, pp. 1-8 ISBN 978-80-87012-69-7 (Print) ISSN 2336-5781 (Print)