Numerical Studies of Turbulent Hypersonic Shock Wave Boundary Layer Interactions

Dart, Laurie (2012). Numerical Studies of Turbulent Hypersonic Shock Wave Boundary Layer Interactions B.Sc Thesis, School of Engineering, The University of Queensland.

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Author Dart, Laurie
Thesis Title Numerical Studies of Turbulent Hypersonic Shock Wave Boundary Layer Interactions
School, Centre or Institute School of Engineering
Institution The University of Queensland
Publication date 2012
Thesis type B.Sc Thesis
Supervisor Russell Boyce
Total pages 84
Language eng
Subjects 0913 Mechanical Engineering
Formatted abstract
This thesis focuses on modelling the behaviour of a shock wave turbulent boundary layer interaction (SWBLI). Solutions are validated against an experiment conducted by Boyce & Hillier (2000). The geometry of the experiment uses a cowl placed around a cylindrical centrebody with a sharp leading edge to give an externally generated shock in a variable axisymmetric/three-dimensional setup. The freestream flow conditions are of high Mach number ( M∞ ≈9) and high Reynold's number ( Re∞ ≈ 50x106 m-1). Specifically, the main thrust of the thesis is toward modelling the axisymmetric incipient separation configuration of the experiment. 

Modelling is carried out using the computational fluid dynamics package CFD++ using a Reynold's averaged Navier-Stokes formulation and the Menter SST two-equation turbulence model. An initial solution is obtained and refined through a grid convergence study. A parametric study is also performed to investigate the effect of altering the inflow turbulent/laminar viscosity ratio, specific dissipation rate, static pressure and velocity. Further investigation is also carried out through using turbulence-off boxes in CFD++ to control the location of the transition point on the cowl surface and analyse effects in the SWBLI region.

Results of the grid convergence study showed that the solution became grid independent when the y+ value in the near wall region was on the order of 0.1 (5.6 million cells for the topology used). The Menter SST model gave very good agreement with experiment for the wall pressure in the SWBLI region and reasonable agreement for the wall heat flux. Modification of the inflow quantities in the parametric study showed that the solution could be modified to fit the experimental data by varying the inflow quantities within the limits imposed by experimental error.

A discrepancy was noted in the experimental data presented by Boyce & Hillier (2000) leading to inconsistencies between the pressure and heat flux data. This observation was validated using data from Schulein (2006). Experimental trends were shown to agree with experiment by normalising the position of the SWBLI; however this should be a topic of further investigation.
Keyword shock wave boundary layer interaction

Document type: Thesis
Collection: UQ Theses (non-RHD) - UQ staff and students only
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Created: Tue, 06 Jan 2015, 15:04:57 EST by Ahmed Taha Siddiqui on behalf of Scholarly Communication and Digitisation Service