Abstract
The present Brief Communication analyzed and demonstrated the failures of the molecular block (MB) model for the direct simulation Monte Carlo (DSMC) method. In the MB model, the gas viscosity and Knudsen number remained the same but the Mach number increased with the MB factor α. Therefore, the flow predicted by the MB model failed to agree with the original flow. Micro Couette flows and microchannel flows were simulated to demonstrate this point. Significant differences were found between results from the MB model and the original DSMC method. When α was large enough so that the Mach number in the MB model exceeded unity, a shock wave appeared in the channel, when there were no shocks in the original subsonic flow.
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