Numerical Solution of the Unsteady Navier-Stokes Equations for the Oscillatory Flow Over a Concave Body.
AEROSPACE CORP EL SEGUNDO CALIF
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The hypersonic flow field over a concave shape has been investigated by numerically solving the unsteady Navier-Stokes equations. Calculations were performed at a freestream Mach number of 10 and a Reynolds number based on freestream properties and the forebody radius of 333. A fully attached high frequency oscillatory flow field was found to exist over the entire surface. This type of oscillation is unique since experimentally observed oscillatory flows about concave shapes have contained separated regions. The nature of the oscillation, its effect on surface properties and the postulated origin of the oscillation, is discussed. Specifically, the flow field appears to be hydrodynamically unstable which results in an oscillatory variation of the flow downstream of the forebody pressure minimum. The resultant temporal variations of the surface pressure and heat transfer are large in the region of the shock inflection point.
- Numerical Mathematics
- Fluid Mechanics