AE 590 Seminar Speaker: Ivan Bermejo-Moreno - Large-eddy simulation of transonic buffet with wind-tunnel confinement effects

Abstract:
Transonic airfoil buffet of a supercritical OAT15A airfoil at Mach 0.72 and an angle of attack of 5º is studied with high-fidelity numerical simulations that aim to replicate wind-tunnel experiments conducted at the Trisonic Wind Tunnel of the Institute of Aerodynamics, RWTH Aachen University. Large-eddy simulations with and without an equilibrium wall model, as well as different spanwise domain length and boundary treatments are performed to assess the effects of wind-tunnel confinement (from the top/bottom and side walls) on the observed buffet-cycle dynamics, including oscillatory lambda-shock motion, shock-induced separation, and wake vortex shedding. Comparisons with Schlieren and particle-image velocimetry (PIV) experimental measurements will be presented, including modal analyses employing spectral proper orthogonal decomposition (SPOD) techniques.

Bio:
Ivan Bermejo-Moreno is an associate professor in the Aerospace and Mechanical Engineering Department of the Viterbi School of Engineering at the University of Southern California. He received an Aeronautical Engineer degree from the Polytechnic University of Madrid, Spain, followed by M.Sc. and Ph.D. degrees in aeronautics from the California Institute of Technology. Afterwards, he held a postdoctoral research fellowship at the Center for Turbulence Research, Stanford University/NASA Ames Research Center. His research combines numerical methods, physical modeling, and high-performance computing for the simulation and analysis of turbulent fluid flows involving multi-physics phenomena. Prof. Bermejo-Moreno is an Associate Fellow of the American Institute of Aeronautics and Astronautics, and the recipient of the NSF CAREER Award, the NASA Early Career Faculty Award, the Fulbright Fellowship, the Rolf D. Buhler Memorial Award, the William F. Ballhaus Prize, and the Hans G. Hornung Prize.