大家帮我看看这个热电耦合为什么不收敛啊？

hdzw

可以有什么改进的方法吗？
请高手帮忙！！谢谢！！

Finish
/clear
/PREP7  
ET,1,PLANE67,,,1
!First process.This process is thermal-electric coupled calculation.
!Material properity.Material 1 is the argon,material 3 is tungsten electrobe.
MPTEMP,1,273,2500,5000,7500,10000,12500
MPTEMP,7,15000,17500,20000
MPDATA,DENS,1,1,1.67,0.2,0.1,0.07,0.04,0.03
MPDATA,DENS,1,7,0.02,0.015,0.014
MPDATA,KXX,1,1,0,0.1,0.2,0.3,0.6,1.6
MPDATA,KXX,1,7,2.4,2.0,2.2  
MPDATA,RSVX,1,1,1000,100,1,1.3e-3,3.3e-4,1.6e-4
MPDATA,RSVX,1,7,1.2e-4,9.8e-5,8.5e-5
MPDATA,C,1,1,521,521,521,600,1250,6000
MPDATA,C,1,7,10000,4000,2500
MPDATA,DENS,3,,19350
MPDATA,RSVX,3,,0.0000000528
MPDATA,KXX,3,,173
K,1,0,0,0,  
k,2,0.01,0,0,  
K,3,0.0002,0,0,
K,4,0.0016,0,0,
K,5,0,0.005,0,  
K,6,0.0002,0.005,0,
K,7,0,0.005+0.0014*sqrt(3),0,   
K,8,0.0016,0.005+0.0014*sqrt(3),0,  
K,9,0.01,0.005+0.0014*sqrt(3),0,
K,10,0.0016,0.005,0,
K,11,0.01,0.005,0,  
A,5,6,8,7   
A,1,3,6,5   
A,3,4,10,6     
A,6,10,8  
A,8,9,11,10   
A,10,11,2,4   
LGLUE,ALL   
AGLUE,ALL
ASEL,S,AREA,,2,6
AATT,1,,1,0,
ASEL,S,AREA,,1
AATT,3,,1,0,
allsel，all
ESIZE,0.0002,0,
MSHKEY,1  
AMESH,ALL
/PNUM,KP,1  
/PNUM,AREA,1
APLOT
FINISH  
/SOL
TUNIF,10000, !uniform temperature
DL,12,,TEMP,1000,0
LSEL,S,LINE,,1,3   !the top of the argon
DL,ALL,,TEMP,3000,0
LSEL,S,LOC,Y,0     !the surface of the tungsten electrobe.
DL,ALL,,TEMP,5000,0
DL,ALL,,VOLT,0     !the bottom of the argon(the top of the workpiece,here the workpiece is neglected)
LSEL,S,LINE,,3
NSLL,S,1           !the top of the tunsten electrobe
F,ALL,AMPS,-160    !Here is the difficulity, because I can't make the direction of current from top to bottom.
ALLSEL,ALL
SOLVE
FINISH

hdzw

没有人吗？
高手快来救命啊！！

woodcopper

个人觉得你的散热条件没有加，没有热边界

hdzw

散热条件，怎么加啊？
我在边缘加了个对流的条件，还是不行。

woodcopper

高温体散热辐射是不能避免的，你没有考虑辐射吗？计算一下可能的当量，比较一下看看是否可以忽略辐射！

lilichunyan

5# woodcopper
能不能具体解释一下啊，如果辐射可以忽略，这个不收敛问题又出在哪啊？