n.稀薄；稀薄化

Simulation results show that rarefaction effect plays an important role in gas damping, which decreases as Kn Number increases. 數(shù)值模擬結(jié)果表明，稀薄效應(yīng)對(duì)氣體阻尼的影響較大，隨著克努森數(shù)的不斷增大，氣體阻尼逐漸減小。

Several applications require consideration of rarefaction, which motivates the present thesis to focus on simulation of driven cavity flows in this region. 因此本文的動(dòng)機(jī)是模擬空穴流場(chǎng)在稀薄區(qū)域上的應(yīng)用。