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Abstract: Computational Fluid Dynamics (CFD), based on Reynolds-Averaged Navier-Stokes (RANS), has a broad range of industrial applications but it fails to accurately predict turbulent flows involving separation. One such application is for aircraft in take-off and landing configurations where RANS does not provide adequate accuracy for stall prediction. A large number of flight test points for aircraft certification fall in the high-lift portion of the flight envelope and significant savings could be accrued if some of the flight points could be substituted by computations provided accurate and robust computational tools were available. In this talk, we first present wall-modeled large eddy simulation (WMLES) as applied to NASA’s high-lift common research model (CRM-HL) since direct numerical simulation (DNS) and wall-resolved large eddy simulation (WRLES) are computationally too expensive for complex geometries and high Reynolds number flows. It is shown that WMLES yields CLmax predictions in good agreement with the experimental results. We then use DNS and WRLES to assess the efficacy of WMLES for a canonical smooth body flow separation configuration, namely, Boeing Speed Bump – an experiment currently being conducted under the sponsorship of ONR, NASA, AFRL and US Army.
Bio: Dr. Mujeeb Malik is the Senior Technologist (ST) for Aerodynamics at NASA and Technical Lead for the Revolutionary Computational Aerosciences under NASA’s Transformative Aeronautics Concepts Program. He has served as Head of Computational AeroSciences Branch at Langley where he led research in the development of advanced CFD methods over a wide speed regime, from subsonic to hypersonic. He also sponsored NASA’s CFD Vision 2030 Study and was the Founding Chair of AIAA CFD 2030 Integration Committee. Dr. Malik is well-known for his work on boundary layer stability and laminar-turbulent transition, in particular for his pioneering research in hypersonic boundary layer transition, developing computational methods and tools for its prediction, and fundamental studies to unravel physics of boundary layer stability in two and three-dimensional flows. Before joining NASA, he was President of High Technology Corporation, a Research & Development firm that he founded. He received his PhD from Iowa State University in 1978. He is a Fellow of AIAA, ASME and American Physical Society. He received NASA’s Exceptional Service Medal in 2012, Silver Achievement Medal in 2018 as well as several group achievement awards over the years.