Detailed numerical modeling of chemical and thermal nonequilibrium in hypersonic flows

Journal Article · Mon Mar 01 00:00:00 EST 1993 · Impact of Computing in Science and Engineering; (United States)

DOI:https://doi.org/10.1006/icse.1993.1002· OSTI ID:5902601

Riedel, U; Maas, U; Warnatz, J ^[1]

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1. Stuttgart Univ. (Germany)

Interest in hypersonic flows has created a large demand for physicochemical models for air flow computations around reentry bodies. Detailed physicochemical models for air in chemical and thermal nonequilibrium are needed for a realistic prediction of hypersonic flowfields. In this paper we develop a model, based on elementary physicochemical processes, for a detailed description of chemical nonequilibrium together with the excitation of internal DOFs. This model is implemented in a 2D Navier-Stokes code in order to show the strong influence of thermal nonequilibrium on the flowfields. The algorithm presented here is based on a fully conservative discretization of the inviscid fluxes in the conservation equations and uses the chain rule conservation law form for the viscous fluxes. The large system of ordinary differential and algebraic equations resulting from the spatial discretization is solved by a time-accurate semiimplicit extrapolation method. 34 refs.

• OSTI ID: 5902601
• Journal Information: Impact of Computing in Science and Engineering; (United States), Vol. 5:1; ISSN 0899-8248
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
HYPERSONIC FLOW
COMPUTERIZED SIMULATION
NAVIER-STOKES EQUATIONS
ALGORITHMS
CHEMICAL REACTIONS
ITERATIVE METHODS
REACTION KINETICS
TWO-DIMENSIONAL CALCULATIONS
CALCULATION METHODS
DIFFERENTIAL EQUATIONS
EQUATIONS
FLUID FLOW
KINETICS
MATHEMATICAL LOGIC
PARTIAL DIFFERENTIAL EQUATIONS
SIMULATION
420400* - Engineering- Heat Transfer & Fluid Flow
990200 - Mathematics & Computers