Christian Stemmer  , Antonio Di Giovanni

DOI Number XXX-YYY-ZZZ

Conference Number HiSST 2018-1950863

We investigate roughness-induced transition scenarios for the capsule boundary layer in re-entry type scenarios with Direct Numerical Simulations (DNS). The effect of chemical equilibrium as well as chemical and/or thermal non-equilibrium on the disturbance development in the wake of the distributed roughness patch is investigated. DNS calculations are undertaken to show the non-linear evolution of the roughness wake and its interaction with unsteady disturbances. For the modelling of the high-temperature gas effects with chemical equilibrium as well as with chemical and thermal non-equilibrium, the amplification of the unstable modes does not enter the non-linear stage and transition does not take place. For the present flow parameters of a typical re-entry case, the interactions of the roughness patch with the distributed roughness leads to laminar-turbulent breakdown for the case of chemical non-equilibrium.

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In Categories: Boundary Layer Control, High-Speed Aerodynamics and Aerothermodynamics, HiSST 2018, Hypersonic Aerodynamics, Operations and Environment, Transition to Turbulence
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