Direct numerical test of the B-G-K model equation by the DSMC method |
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Authors: | Shen Ching Yi Zhiqiang |
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Institution: | (1) Institute of Mechanics, Chinese Academy of Sciences, 100080 Beijing, China |
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Abstract: | In the present paper the rarefied gas flow caused by the sudden change of the wall temperature and the Rayleigh problem are
simulated by the DSMC method which has been validated by experiments both in global flow field and velocity distribution function
level. The comparison of the simulated results with the accurate numerical solution of the B-G-K model equation shows that
near equilibrium the B-G-K equation with corrected collision frequency can give accurate result but as farther away from equilibrium
the B-G-K equation is not accurate. This is for the first time that the error caused by the B-G-K model equation has been
revealed.
The project supported by the National Natural Science Foundation of China (19772059, 19889209) |
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Keywords: | BGK model equation DSMC method rarefied gas flow Rayleigh problem |
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