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Article information
2003 , Volume 8, Special issue, p.106-123
Pagella A., Rist U.
Direct numerical simulations of shock-boundary layer interaction at M=6
Two boundary layers with impinging shock wave at M=6, T_infty=78K and a shock angle with respect to the wall of sigma=12 degree are compared: a boundary layer with insulated wall and a cooled case with T_w=300K. As expected, the length of the separation bubble is smaller for the case with cooled wall. Linear stability calculations show, that the first instability mode could be completely stabilised by wall cooling in the underlying case. However, it is known that cooling destabilizes higher, acoustic modes, which is the case here, too. An oblique breakdown scenario reveals the formation of longitudinal vortices in both cases with shock, mainly promoted by the non-linear growth of the (0,2) mode. The maximum disturbance amplitudes are larger for the case with insulated wall and the disturbance parameters chosen. The structure of the (0,2) mode is different in the cases with shock, compared to the boundary layer without shock. The wall-normal velocity component $v$ in the base flow of the boundary layer without shock counteracts the formation of longitudinal vortices in the total flow.
Classificator Msc2000:- *76M12 Finite volume methods
- 76N15 Gas dynamics, general
Keywords: correlation attack, block cipher, random number generator, statistical test
Author(s):
Pagella Alessandro
Office: Institute of Aerodynamics and Gasdynamics, University of Stuttgart
Address: D-70550, Germany, Stuttgart, Pfaffenwaldring, 21
E-mail: pagella@iag.uni-stuttgart.de
Rist U.
Office: Institute of Aerodynamics and Gasdynamics
Address: D-70550, Germany, Stuttgart, Pfaffenwaldring, 21
Bibliography link:
Pagella A., Rist U. Direct numerical simulations of shock-boundary layer interaction at M=6 // Computational technologies. 2003. V. 8. The Special Issue: Proceedings of the Russian-German Advanced Research Workshop on Computer Science and High Performance Computing, Part 1. P. 106-123
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