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13925835350新蟲 (小有名氣)
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[求助]
請(qǐng)問(wèn)下面這段英文里的“ the volume is effectively infinity”怎么理解?
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請(qǐng)問(wèn)下面這段英文里的“ the volume is effectively infinity”怎么理解,能解答一下嗎? the value that LAMMPS computes as pressure under non-periodic boundary conditions has no meaning. please see the formula, how pressure is computed here: http://lammps.sandia.gov/doc/compute_pressure.html under non-periodic boundaries, the volume is effectively infinity and doesn't change. what LAMMPS uses as volume of the simulation cell is truncated completely arbitrarily for technical and convenience reasons. thus if you correct for this arbitrary truncation, the pressure *must* be zero by definition, since any finite number divided by infinity results in zero. |
新蟲 (小有名氣)
木蟲 (正式寫手)

木蟲 (正式寫手)
| 我只是字面反應(yīng),具體的我也不是這個(gè)方向的。但是問(wèn)題應(yīng)該在 “非周期性邊界條件“,既然邊界不是周期性的那就是說(shuō)邊界無(wú)窮大?我也不懂,問(wèn)問(wèn)做模擬的吧 |

木蟲 (正式寫手)

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