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【求助】求助拉格朗日方法追蹤顆粒擴(kuò)散 已有7人參與
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請(qǐng)問(wèn)拉格朗日追蹤顆粒擴(kuò)散就是用拉格朗日模型算嗎?還是也可以用歐拉方法模型啊 [ Last edited by 一把雨傘 on 2010-12-4 at 15:56 ] |

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金蟲(chóng) (小有名氣)
銅蟲(chóng) (小有名氣)
| 固體顆粒用拉日追蹤,通過(guò)流場(chǎng)對(duì)顆粒作用力,有系列公式,得到F=ma的常微分方程,解得顆粒位置,用于計(jì)算下一步流場(chǎng)對(duì)顆粒作用力;流場(chǎng)用歐法計(jì)算,可/不考慮顆粒對(duì)流場(chǎng)反作用,考慮時(shí)用kernal函數(shù)將反作用力差值到流場(chǎng),作為流場(chǎng)方程中的體力項(xiàng),兩者時(shí)間步可協(xié)調(diào)。 |
木蟲(chóng) (正式寫(xiě)手)
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flakid 你好 想向您請(qǐng)教個(gè)問(wèn)題 Cunningham correction factor should not be included in a diffusion coefficient, since the statistics of the random walk process is not affected by the distance between the gas molecules relative to the size of the particle. However, this distance may affect the particle mobility in an external field. 但是很多文獻(xiàn)中給出的顆粒擴(kuò)散系數(shù)表達(dá)式中包含了Cunningham correction factor 。希望大牛們給些建議。 特別是這句話: since the statistics of the random walk process is not affected by the distance between the gas molecules relative to the size of the particle. However, this distance may affect the particle mobility in an external field. 這句話怎么理解?這句話與擴(kuò)散系數(shù)是否應(yīng)該包含Cunningham correction factor有關(guān)系嗎? |
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