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ISSN Online: 2379-1748

ISBN Flash Drive: 978-1-56700-483-0

ISBN Online: 978-1-56700-482-3

4th Thermal and Fluids Engineering Conference
April, 14–17, 2019 , Las Vegas, NV, USA

COMPRESSIBILITY EFFECT ON SPATIALLY-DEVELOPING TURBULENT BOUNDARY LAYERS VIA DNS

Get access (open in a dialog) pages 1855-1863
DOI: 10.1615/TFEC2019.tfl.028382

Resumo

High-speed spatially-developing turbulent boundary layers (SDTBL) in compressible flows are of crucial importance in aerospace applications, for instance in the aerodynamic heating on supersonic vehicles. In this study, Direct Numerical Simulation (DNS) of compressible spatially-developing turbulent boundary layers is performed at a Mach number of 2.5 over an isothermal flat plate. Turbulent inflow information is generated by following the concept of the rescaling-recycling approach introduced by Lund et al. (J. Comp. Phys. 140, 233-258, 1998), although, the proposed methodology is extended to compressible flows. Furthermore, a dynamic approach is employed to connect the friction velocities at the inlet and recycle stations (i.e., there is no need of an empirical correlation as in Lund et al. [16]). Low/high order flow statistics are compared with direct simulations of an incompressible isothermal Zero Pressure Gradient (ZPG) boundary layer at similar Reynolds numbers and temperature regarded as a passive scalar. Focus is given to the assessment of flow compressibility on the dynamics of coherent structures. Results have shown that large hydrodynamic turbulent structures are finer and less organized in compressible flow than in the incompressible regime, with less intense "gaps" of high speed fluids in between.