特别奇怪的问题，为什么结果不对称？

是一个热电耦合的程序，我只用了1/4的空间，因为是全部对称的。所加的边界条件什么的，全部都是对称的，但是为什么结果不对称呢（温度场）？请高人指点一下啊！！快急死了！！
如果不加电流，得到的结果是耦合的
Finish
/clear
/PREP7
ET,1,PLANE67
KEYOPT,1,3,1
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,VISC,1,1,2e-5,7e-5,1e-4,2.2e-4,2.7e-4,2e-4
MPDATA,VISC,1,7,6e-5,3e-5,2.6e-5
MPDATA,DENS,2,,7200
MPDATA,KXX,2,,20
MPDATA,RSVX,2,,1/770000
MPDATA,DENS,3,,19350
MPDATA,RSVX,3,,0.0000000528
MPDATA,KXX,3,,173
MPDATA,MURX,1,,1
MPDATA,MURX,3,,1
/REPLOT,RESIZE
TOFFST,0
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
ET,2,SOLID69
ESIZE,0,20,
TYPE,2
MAT,1
VROTAT,4,5,2,3,6,,1,7,90,,
TYPE,2
MAT,3
VROTAT,1,,,,,,1,7,90,,
ACLEAR,1,6,
/VIEW,1,-1,1,1
APLOT
FINISH
/SOL
TUNIF,10000,
DA,11,TEMP,1000,0
ASEL,S,AREA,,17
ASEL,A,AREA,,9
DA,ALL,TEMP,3000,0
ASEL,S,AREA,,15
ASEL,A,AREA,,19
ASEL,A,AREA,,23
DA,ALL,TEMP,5000,0
DA,ALL,VOLT,0,0
ASEL,S,AREA,,27
NSLA,S,0
F,ALL,AMPS,-200
ALLSEL,ALL
SOLVE
SAVE
FINISH