CFD simulations are run for a wide range of flow conditions to construct a database of aerodynamic coefficients, which is used for the calculation of aircraft performance or predictions of flight path. The figure shows pressure distributions by our simulation for a supersonic transport designed by JAXA. |
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Aerodynamics of a delta wing are characterized by a pair of leading-edge separation vortices. A rolling motion can be excited at high-angles of attack due to asymmetry of the vortices. The figure compares the surface pressure distributions of a rolling wing obtained by the CFD and a wind-tunnel experiment provided by Tohoku University. |
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A flutter, caused by coupled forces of aerodynamics, inertia and elasticity, must be carefully analyzed for the safety of aircrafts. We develop aeroelastic simulation method based on high-fidelity elastic model (as shown in the Figure) and unsteady CFD method for deforming wings. |
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High-order accurate CFD methods are required for more advanced aerodynamic analyses/designs including a prediction of a flow separation and transition to turbulence over a wing. The figures show a transitional flow forming a laminar separation bubble, where the orders of accuracy are increased from left to right in the figures. |
Numerical computations of high-speed gas dynamics (Computational Fluid Dynamics, CFD) are main topics in our laboratory. In addition to a development of unstructured-grid methods for high-fidelity simulations of aircrafts, predictions of dynamic stability due to unsteady aerodynamics, such as a coupled simulation with aircraft dynamics or aeroelastic simulations of flutter are our specific concerns. We also work for developing a higher-order CFD method for broader applications and enhanced reliabilities.
Some research topics are collaborative works with other research groups. Recent themes are quantification of the propagation of uncertainty of input conditions, or, prediction of aerodynamics and flight trajectories of an experimental vehicle being developed in JAXA for future aerospace vehicle.
Keyword：Aerodynamic performance,
Computational fluid dynamics
E-mail：miyaji@ynu.ac.jp
