Bi-global secondary stability theory for high-speed boundary-layer flows

  title={Bi-global secondary stability theory for high-speed boundary-layer flows},
  author={G. Groskopf and Markus J. Kloker and Olaf Marxen},
A finite-difference solver for bi-global secondary linear stability theory is presented and applied to laminar Mach 4.8 boundary-layer flows altered by 3-D “pizza-box” type roughness elements on a flat plate. The steady primary state in flow crosscuts is extracted from accompanying spatial direct numerical simulations (DNS) employing the immersed-boundary technique for the roughness element that is roughly 0.5 undisturbed boundary-layer thicknesses high. A comparison of the stability-theory… CONTINUE READING
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