Development of Hybrid Wind Tunnel Through Integration of Supercomputer and Experimental Wind Tunnel

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This research project aims to establish a new analysis methodology to complex flow problems. Through integration of numerical wind tunnel and experimental wind tunnel, a "Hybrid Wind Tunnel" was developed. First, an experimental wind tunnel was constructed and was connected to the supercomputer system of the Institute of Fluid Science, Tohoku University through a Gigabit Ethernet. As a fundamental flow field, Karman Vortex Street in the wake of a square column in a uniform flow was investigated. A pressure signal on a side wall of the column is fed back to the real-time computation to reduce the estimation error. After some transient, the computational result for the flow field converges to the real flow. The feedback law was optimized through numerical simulation and confirmed by experiment. Using pressure measurement on both sides of the square column, the computational result well converges to the real unsteady flow including the effect of perturbations initially existent in the main flow. Real time computation is essential in the hybrid wind tunnel and is explored through parallel computing. Blood flow control in living bodies and aerodynamic drag reduction of vehicles by feedback control are also investigated as possible application of hybrid wind tunnel.