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chuntao118新蟲 (著名寫手)
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[求助]
關于kinetic energy, translational kinetic energy and rotational energy 已有1人參與
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各位老師大家好: 現(xiàn)在有個問題有點困惑:特向各位老師請教一下。望大家不吝賜教! 1、在穩(wěn)態(tài)分子動力學(MD )模擬中:kinetic energy= translational kinetic energy + rotational energy(并且完全依賴與體系的溫度。┦欠裾_。若不對,請問為什么? 2、在非穩(wěn)態(tài)分子動力學模擬中(NEMD) 模擬中:kinetic energy= 宏觀流動產生的動能(外力做的功)+ translational kinetic energy + rotational energy(此時由于體系流體分子受到外力場的作用,流體分子的動能不僅僅依賴于體系的溫度,同時也依賴于外力場對分子做的功)是否正確。若不對,請問為什么? 3、對于上述問題的最好給出相應的參考文獻! |
專家顧問 (著名寫手)
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專家經(jīng)驗: +218 |
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First, I feel that your terminologies are not standard. Your 穩(wěn)態(tài)分子動力學 should be equilibrium MD; 穩(wěn)態(tài) is not equilibrium state. 穩(wěn)態(tài) corresponds to steady state, which usually refers to non-equilibrium state. So your 非穩(wěn)態(tài)分子動力學 should be 穩(wěn)態(tài) non-equilibrium MD. So you are studying rigid-body systems? In any case, total kinetic energy = translational kinetic energy + rotational kinetic energy. The translational kinetic energy generally consists of two parts: a center of mass part and a part relative to the center of mass, the latter being related to the temperature. The same can be said for the rotational kinetic energy. The important information here is that temperature is related to thermal motion and global motion should be removed before calculating the temperature. I think this is textbook stuff and I don't know what is the best reference. |
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