Numerical study of microramp control of supersonic shock wave/boundary layer interaction

31 Chapter 3 Computational Strategies Forthiswork,severalsimulations,bothbi-dimensionalandthree-dimensional, have been performed. Firstly, since we need to replicate the exactly conditions of DNS [20], a set of 2D simulations for the analysis of the undisturbed bound- ary layer was executed with the dierent turbulence models, in order to find the section in which the friction Reynolds numberRe · reached the target value of 510, and the boundary layer thickness ” 99 at the same location, since the dimensions of the final domain and of the microramp were given in function of thisparameter. Then, 2DsimulationsontheuncontrolledSBLIwereperformed for each turbulence model, to obtain the flow conditions which the microramp aimed to control. Finally, a set of 3D simulations of the microramp control of the SBLI was carried out. 3.1 Computational Domain and Setup The computational domain adopted for the 2D simulations has been built with ANSYS SpaceClaim Software and the size isL x ◊ L y =208.5mm◊ 70mm. The analysis of the undisturbed boundary layer allowed to define the location of the microramp and consequently of the wedge, known the shock angle ‡ and the distance between the impingement point and the trailing edge of the ramp L shock . There was, however, a certain freedom in choosing the height of the wedge, which was positioned at 50mm from the wall, such that it does not influence the upstream boundary layer in any way and at the same time does not require a higher domain, which would have required greater computational