Numerical simulations of turbulent spots in supersonic boundary layers: effects of Mach number and wall temperature
Redford, J.A., Sandham, N.D. and Roberts, G.T. (2012) Numerical simulations of turbulent spots in supersonic boundary layers: effects of Mach number and wall temperature. [in special issue: Applied Computational Aerodynamics and High Performance Computing in the UK] Progress in Aerospace Sciences, 52, 67-79. (doi:10.1016/j.paerosci.2011.08.002).
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The compressible Navier–Stokes equations are solved for turbulentspots in otherwise laminar boundary layers with external flow Machnumbers of 3 and 6. In each case two walltemperature conditions are simulated, one corresponding to an adiabatic wall and the other to a cooled wall where the walltemperature is equal to the free stream temperature. The simulations show that the main parameter determining the spot lateral growth rate is the Machnumber. The walltemperature plays a secondary role, with the cooled wall cases having lower lateral growth rates. The lateral spreading near the wing tips of the spots is examined in detail, revealing two components of the lateral growth mechanism. Firstly, turbulent structures are shown to convect outwards from the core of the spot, accounting for half the lateral growth rate at Mach 3 and three quarters at Mach 6. Secondly, new structures are created, the origin of which is shown to be in the instability of lateral jets of fluid issuing from the spot.
|Keywords:||turbulent spots, dns, compressible flow, transition to turbulence, supersonic flow|
|Subjects:||Q Science > QC Physics
T Technology > TL Motor vehicles. Aeronautics. Astronautics
|Divisions:||University Structure - Pre August 2011 > School of Engineering Sciences
University Structure - Pre August 2011 > School of Engineering Sciences > Aerodynamics & Flight Mechanics
|Date Deposited:||12 Jan 2011 16:07|
|Last Modified:||25 Apr 2013 23:34|
|Contributors:||Redford, J.A. (Author)
Sandham, N.D. (Author)
Roberts, G.T. (Author)
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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