Laminar-Turbulent Transition and Flow Control in Boundary Layers
The flow layer near the surface of a body - the boundary layer - can have a smooth, steady, low-momentum laminar state, but also an unsteady, turbulent, layer-stirring state with increased friction drag and wall heat flux. Wall heating is especially severe with supersonic hot gas flows like, e.g., in a rocket (Laval-) nozzle extension. To protect the walls from thermal failure a cooling gas is injected building a cooling film. Its persistence depends strongly on the layer state of the hot-gas flow, the type of cooling gas, and the form and strength of injection. Fundamental studies are performed using direct numerical simulations, providing also valuable benchmark data for less intricate computational-fluid-dynamics methods using turbulence models.
Principal Investigators: Markus J. Kloker, Ulrich Rist, Institute for Aerodynamics and Gas Dynamics, University of Stuttgart (Germany)
HPC Platform: Hornet/Hazel Hen of HLRS - Date published: February 2017
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