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Aerospace Engineering pres.

Chair's Distinguished Lecture: Boundary Layer Stability Analysis of the BOLT Hypersonic Flight Experiment

Graham Candler McKnight Presidential Chair and Russell J. Penrose Professor Aerospace Engineering & Mechanics University of Minnesota

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Graham Candler
McKnight Presidential Chair and Russell J. Penrose Professor
Aerospace Engineering & Mechanics
University of Minnesota

The Boundary Layer Transition (BOLT) sounding rocket flight experiment will be launched in May of 2020. BOLT is designed to make detailed measurements of the boundary layer state and the onset of transition to turbulence on ascent at about Mach 5 and on descent at Mach 7.5. BOLT has a complex nose geometry, highly swept leading edges and a concave surface, which challenge the validity of conventional stability analysis methods. At Minnesota we have been developing new approaches for predicting instability growth for complex geometry flows. The seminar will discuss results and progress using high-order, low-dissipation numerical methods to perform “quiet” direct numerical simulations of the BOLT flow field. The simulations reveal four different instability mechanisms; these include with a vortical disturbance associated with boundary layer roll-up on the centerline, traveling crossflow due to boundary layer distortion near the leading edge, and a complex multi-mode instability near the trailing edge. Comparisons to the available wind tunnel data will be presented. The prospects for extending the DNS to laminar flow breakdown and transition to turbulence will also be discussed.

About the Speaker...

Graham V. Candler is the Russell J. Penrose and McKnight Presidential Chair of Aerospace Engineering and Mechanics, University of Minnesota. He received his Ph.D. in Aeronautics and Astronautics from Stanford University in 1988. His current research interests are in the areas of computational fluid dynamics of hypersonic flows, CFD method development, high-temperature nonequilibrium gas dynamics, re-entry and hypersonic aerodynamics, and stability and transition of hypersonic flows. In his research, he supervised the development of the data-parallel line-relaxation method and the widely used NASA DPLR CFD code; he was instrumental in the development of the STABL boundary layer stability analysis tool, and its three-dimensional version, STABL-3D. He is a co-developer of the unstructured grid extension of the DPLR code, US3D, which is becoming a leading method for hypersonic and re-entry flow simulations. He has used these simulation tools to study a wide range of supersonic and hypersonic flows, including supersonic parachutes, ablating re-entry vehicles, scramjet flow paths, and hypersonic transition processes with high-enthalpy effects. He has published over 400 articles in various journals, conferences, and books.
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