S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Mechanical Aerospace Engineering (기계항공공학부) Journal Papers (저널논문_기계항공공학부)
An axisymmetric computational model of generalized hydrodynamic theory for rarefied multi-species gas flows
- Ahn, Jae Wan; Kim, Chongam
- Issue Date
- JOURNAL OF COMPUTATIONAL PHYSICS Vol.228 No.11, pp. 4088-4117
- 복합학; Generalized hydrodynamic equation; Hypersonic rarefied flow computations; Computational fluid dynamics; Second law of thermodynamics; Nonequilibrium effect
- On the basis of the Eu's generalized hydrodynamic (GH) theories for diatomic single species gas and monatomic multi-species gas, an axisymmetric CH computational model for multispecies gas containing monatomic and diatomic molecules is developed for the numerical simulation of hypersonic rarefied gas flows. The multi-species GH computational model includes monatomic and diatomic species of O-2, N-2, NO, O, N. The mass diffusion flux of the gas mixture is included in the GH constitutive relation. In addition, the physical relationship between the mass diffusion and heat fluxes is added to the evolution equation set. The multi-species GH theory includes the rotational nonequilibrium effect of diatomic molecules by introducing excess normal stress associated with the bulk viscosity. An efficient multi-species GH numerical solver for axisymmetric rarefied flows is then developed by adopting various numerical techniques, such as an adequate nonlinear equation solver for the GH constitutive relation, an accurate flux splitting scheme, multi-grid convergence acceleration and slip-wall boundary conditions. For validation, the proposed computational model is applied to hypersonic rarefied flows over a space shuttle nose, a sphere and a reentry body as well as 1D shock structure. By comparing the results of the multi-species CH model with those of the Navier-Stokes equation and the DSMC, the accuracy and physical consistency of the GH computational model are critically examined. (C) 2009 Elsevier Inc. All rights reserved.
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