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- W83889681 abstract "The generalized hard sphere collision model (GHS) was introduced by Hassan and Hash [Physics Fluids A, 5, 738-744, 1993]. At low temperatures, where the attractive intermolecular forces are important, the GHS collision model produces a more accurate variation of viscosity with temperature than the standard Variable Hard Sphere (VHS) collision model. In spite of this, the GHS model remains virtually unused because of its great computational expense compared to the VHS model. A slight modification of the GHS model, described in [Macrossan and Lilley, Journal of Thermophysics Heat Trans, 17, 289-291, 2003], makes it no more than 5-15% more computationally expensive than the VHS model. We compare the GHS and VHS models for a blunt body flow with T0 = 1300 K. We calculate the supersonic flow of Argon, with a freestream temperature of 100 K, around a flat plate normal to the freestream. The wall temperatures were 1300 K (front) 500 K (rear), with diffuse reflection. The viscosity for the modified GHS and VHS models used here are compared in Fig. 2 with the recommended argon viscosity [3], over the range of temperatures in the flow. The temperature in the wake region is approximately 500 K, so the viscosity of the two models differs most there. This leads to small differences in the temperature field and the size of the re-circulation region. The GHS model required only 5% more CPU." @default.
- W83889681 created "2016-06-24" @default.
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- W83889681 date "2005-01-01" @default.
- W83889681 modified "2023-09-27" @default.
- W83889681 title "Modified GHS Collision Model Compared with VHS Model" @default.
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