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w76990480

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super-emuch

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[求助] 热导率计算heat/flux 问题

本人最近在计算ZnO热导率
用了两种方法,同一个势函数
1.heat/flux 方法
计算结果如下图
计算得到的热导率大概50w/mk左右
热导率计算heat/flux 问题
1.jpg


热导率计算heat/flux 问题-1
2.jpg

2.thermal/conductivity方法
利用thermal/conductivity计算10nm 热导率大概5w/mk左右
两个方法为什么差距这么大呢?
温度梯度也是线性的
热导率计算heat/flux 问题-2
3.jpg

[ Last edited by w76990480 on 2013-7-19 at 17:46 ]
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w76990480

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引用回帖:
3楼: Originally posted by z654023015 at 2013-07-21 17:00:37
你应该把你的in文件贴出来一下,还把你计算的体系说明白一点

Dear lammps users:
    I have some questions on ZnO thermal conductivity calculation,The fix heat/flux and fix thermal/conductivity command were selected to calculating the ZnO thermal conductivity.
    1.fix heat/flux
      I wrote the input file like the manual (http://lammps.sandia.gov/doc/compute_heat_flux.html), the average thermal conductivity of ZnO(Model: x 5.0nm y 4.8nm z 5.3nm) is about ~50W/mk.   The thermal conductivity-m curve you can see the fig 1 in the attachment.
    2.thermal/conductivity
      The periodic boundary wurtzite-type ZnO was selected to calculating thermal conductivity in x y z direction 2.8nm 2.9nm 15.7nm respectively。The main command as following:
      fix      temp_profile all ave/spatial 1 100000 100000 z lower 1.0 v_temp file temp.profile units lattice  #YL for test
      fix      heat_swap all thermal/conductivity 10 z 60
      fix      e_exchange  all  ave/time  10  1  100000  f_heat_swap  file e_exchange.dat
      fix accumu_thermalK_out all ave/time 10 1 100000 v_accumu_thermalK file thermal_conductivity.dat
      I used this “variable accumu_thermalK equal f_e_exchange*${ev2J}/(2*0.001*${N}*${ps2s}*${Ox}*${Oy}*${An2m}*f_delta_out)*(${Oz}/60.0*26.0)” variable command to calculating it.
          timestep 0.001
          N        step
      Is it right(this variable to calculate the thermal conductivity)?
      Temperature gradient is linear in the fig 2 (in the attachment). the average thermal conductivity is about 5W/mk.

     Now, Two kinds of method to calculate the thermal conductivity of why have so big difference(The two methods with the same potential)?
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4楼2013-07-21 22:00:36
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马江将

金虫 (小有名气)

楼主你好! 我也是求热导率 用heat/flux  但遇到问题没有求出来 !你既然求出来,麻烦你帮忙看看 我的输入卡是哪部分有问题。
在我发的求助贴(lammps求热导率的问题)中可以看到 in文件  

祝你的疑问尽早解决!
凝聚态
2楼2013-07-20 16:11:49
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z654023015

铜虫 (初入文坛)

你应该把你的in文件贴出来一下,还把你计算的体系说明白一点
3楼2013-07-21 17:00:37
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lchunmei001

木虫 (正式写手)

引用回帖:
4楼: Originally posted by w76990480 at 2013-07-21 22:00:36
Dear lammps users:
    I have some questions on ZnO thermal conductivity calculation,The fix heat/flux and fix thermal/conductivity command were selected to calculating the ZnO thermal conductivi ...

请教楼主,您_e_exchange*${ev2J}/(2*0.001*${N}*${ps2s}*${Ox}*${Oy}*${An2m}*f_delta_out)*(${Oz}/60.0*26.0)这个公式里的(${Oz}/60.0*26.0)是什么意思,对应http://muchong.com/bbs/viewthread.php?tid=2416486这个帖子里的法2,一直没太明白最后那个6.0/8.0只的是什么,包括法3里的((4.0*8.0*8.0*8.0/0.844)^(1.0/3.0)和6.0/8.0,还请楼主不吝赐教,谢谢。
5楼2013-08-14 09:48:31
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