Direct Numerical Simulation for Laminar-to-Turbulent Transition Prediction
Speaker: Dr. Lian Duan
Dr. Lian Duan is currently a research scientist at the National Institute of Aerospace resident in NASA Langley Research Center. He received his Ph.D. in Mechanical and Aerospace Engineering from Princeton University in 2011. His research interests include direct and large-eddy simulations, chemically reacting flow modeling, high-speed transitional and turbulent flow simulation, and laminar and turbulent flow control. He is a winner of AIAA Laurence J. Bement Award for Young Professional Paper Competition (2012) and a recipient of Princeton University Crocco Award for Teaching Excellence (2008).
Laminar-to-turbulent transition prediction and control is one of the key enabling technologies for quiet and efficient aircraft. Accurate prediction of transition requires a holistic approach, which accounts for all major stages within transition (namely, receptivity, linear growth, nonlinear interactions and secondary instability) in an integrated manner. In this talk, we will focus on direct numerical simulation (DNS) studies of laminar-to-turbulent transition in two aspects. One is to characterize the acoustic freestream fluctuations radiating from supersonic/hypersonic turbulent boundary layers (under supersonic/hypersonic conditions, with adiabatic/cold walls), which is an important step to enable meaningful application of receptivity theory in the context of actual wind-tunnel experiments. The other is to investigate the secondary instability and breakdown mechanisms of crossflow vortices in three-dimensional swept-wing boundary layers, which is critical for the development of engineering methodologies for the design and optimization of roughness-based laminar flow control.
Additional information, including the webcast link, can be found at the NIA CFD Seminar website,which is temporarily located at