UFR 3-08 Best Practice Advice
3D boundary layers under various pressure gradients, including severe adverse pressure gradient causing separation
Underlying Flow Regime 3-08 © copyright ERCOFTAC 2004
Best Practice Advice
Best Practice Advice for the UFR
Experiments on the flow around an inclined spheroid have been conducted in the NWG DLR and F1 ONERA wind tunnels with the aim to provide data for validation of numerical methodologies. This flow has been considered, with the main objective of assessment of turbulence models, during the E.C. funded project ECARP. Turbulence models varying from the algebraic Baldwin-Lomax to non linear κ-ε and Reynolds stress models have been used. Results achieved by using the κ-ε-v2 model can also be found in literature.
The numerical results present an acceptable agreement with the experimental data in the zone of attached flow but discrepancies can be seen in the separated flow region. In this zone only high order turbulence models provide, at least qualitatively, correct results. From an analysis of the simulations performed for this flow it is resulted important to use a cubic version of the non linear κ-ε model and to neglect a wall-reflection pressure correction term in the Reynolds stress model used. The importance of imposing realizability constraints to the turbulence time scale in order to have a linear rate of turbulence energy production in the stagnation flow zones has been recognized.
© copyright ERCOFTAC 2004
Contributors: Pietro Catalano - CIRA