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Bessel木蟲 (正式寫手)
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[求助]
請誰能解釋一下Lammps里removing a "bias" from the atom velocities.
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看了半天說明和其他文獻(xiàn),百思不得其解。 fix langevin command : like other fixes that perform thermostatting, this fix can be used with compute commands that remove a "bias" from the atom velocities. E.g. removing the center-of-mass velocity from a group of atoms or removing the x-component of velocity from the calculation. This is not done by default, but only if the fix_modify command is used to assign a temperature compute to this fix that includes such a bias term. See the doc pages for individual compute commands to determine which ones include a bias. In this case, the thermostat works in the following manner: bias is removed from each atom, thermostatting is performed on the remaining thermal degrees of freedom, and the bias is added back in. 是不是說,比如我有一個沿X方向的couette flow,應(yīng)為摩擦體系溫度要升高,為了保持體系的溫度,施加了langevin恒溫器,但是在計(jì)算體系的溫度時(shí),要把x方向的動能刨除?不知道我理解的對不對? 關(guān)鍵問題是,“bias”到底是什么?我一直不理解。 謝謝! |
木蟲 (小有名氣)
木蟲 (正式寫手)
木蟲 (小有名氣)
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