A new technique for low-to-high altitude predictions of ablative hypersonic flowfieldsA parabolized Navier-Stokes (PNS) technique for predicting chemically reacting reentry flows over a wide range of altitudes extending from zero to 259 kft is presented. This coupled-chemistry PNS scheme can use either a strongly implicit solution approach or a two-step solution approach and is used to study a hypersonic flow over various configurations over a Mach-number range of 6.89 to 20. It is demonstrated that the two-step solution provides a combination of accuracy, stability, and computational efficiency. Nonablating low-altitude calculations show that the flowfield is in chemical equilibrium only in the near-wall region, while finite-rate chemistry effects are significant over a major portion of the shock layer, and the Blottner-type linearization of the production terms is unstable for low-altitude high-Reynolds-number conditions.
Document ID
19910058832
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Bhutta, Bilal A. (VRA, Inc. Blacksburg, VA, United States)
Lewis, Clark H. (VRA, Inc. Blacksburg, VA, United States)