Abstract
Mass-flow reduction of rarefied gas through a two dimensional slit by roughness of a slit surface is investigated numerically. The direct simulation Monte-Carlo method is very effective in an analysis of rarefied gas flow but it costs a lot of CPU time, especially for the near-continuum regime. Recently, some super-computers with a vector processor are available and they enable high-speed calculation. It is necessary for using them in the best condition that a program is adequately vectorized. The programming technique called 'collection of data' is used very often, so that the simulation program eight times faster than conventional one is attained. In the transition regime, the effect of roughness of the slit surface on rarefied gas flow becomes clear. An experiment is carried out in order to confirm the effect.
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