When it comes to designing aircraft, computational fluid dynamics (CFD) has become the foundation. Wind-tunnel and flight testing are now used to validate the models first developed using CFD. But as the ability to simulate complicated air-vehicle aerodynamics has grown, so has the software. Some CFD codes have expanded to the point where they can only run on supercomputers, and even then too slowly to perform the number of analyses required to fully optimize a design. As engineers ...

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