Computation of hypersonic separated flows over compression ramps using time-iterated parabolized Navier-Stokes algorithm
Date
2000
Authors
Lahiri, Sudeep Kumar
Major Professor
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Tannehill, John C.
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Abstract
Separated hypersonic flows are traditionally computed using the complete Navier-Stokes (NS) equations. Recently, a very efficient numerical method has been developed which iteratively solves the parabolized Navier-Stokes (PNS) equations. The method is called the time-iterated parabolized Navier-Stokes (TIPNS) algorithm. The PNS equations are normally solved using a single-sweep space-marching approach, which excludes flows with upstream influences. The multiple-sweep TIPNS approach allows flows with strong upstream influences to be computed. As a result, a large flow domain with multiple regions of strong upstream influences can be solved more efficiently using a combination of the single-sweep PNS and the multiple-sweep TIPNS approaches, than with a full Navier-Stokes solver. The TIPNS algorithm has been used in the present study to compute hypersonic separated flows over compression ramps. Compression ramp flows with different ramp angles were computed to show the upstream influence handling capability of the TIPNS approach. Solutions are compared with experimental data and with NS computations obtained with the NASA OVERFLOW code. The TIPNS results show excellent agreement with the experimental data and also with the NASA OVERFLOW code results.
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