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GARTEUR TP 138

Application of Transition Criteria in Navier Stokes Computations / M.T. Arthur;H. S. Dol;A. Krumbein;R. Houdeville;J. Ponsin. - GARTEUR TP 138. January 2003

Summary:

Introduction of transition criteria in Navier-Stokes (NS) codes needs to overcome the lack of precision obtained on the boundary layer velocity profiles with respect to bound- ary layer solvers. This is confirmed in the first step of the study by considering the AEROSPATIALE B-airfoil with imposed transition location. All the NS solvers used by the partners give poor quality results as concerns the boundary layer parameters. Facing this dificulty, two strategies of implementation of transition criteria have been chosen by the partners in the second step: i) coupling Navier-Stokes and boundary layer solvers, ii) adapting transition criteria to have them less sensitive to the precision problem. With the first strategy, high quality results regarding the transition prediction are expected thanks to the use of BL solvers well suited to the incorporation of elaborate transition criteria. This is obtained at the cost of a coupling process between two different solvers. The second strategy is more straightforward, and right now useful in 3D flows providing introduction of crossflow instability criterion, but at the cost of a more or less limited precision level depending on the flow configuration. The two strategies have been successfully implemented and validated for 2D flows by considering the AS B-airfoil at low Mach number and, in the third step, the transonic CAST10 airfoil in a very difficult configuration relatively to transition prediction. The case of a multi-element airfoil at high incidence has also been considered by NLR.

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