请教辐射问题

chjuan

做了个例子，是关于炉体加热的，炉体加热辐射内管加热，再加热中心一点。但是一旦考虑到辐射，就发现结果随着time设定的时间不同而不断增加，请教一下是什么问题呢？能否讨论或帮修改呢？谢谢啦~~~
邮箱：hongjuan@mail.nankai.edu.cn
命令流如下：

RECTNG,0,0.001,0.15,0.151
NUMCMP,ALL

!******************mesh

asel,s,,,8
aatt,2,,1
aesize,all,0.001

asel,s,,,4,6,2
aatt,1,,1
aesize,all,0.002

asel,s,,,1,3
asel,a,,,5,7,2
aatt,3,,1
AESIZE,all,0.005,

allsel
MSHKEY,2
AMESH,all

!****************边界条件

LSEL,S,LINE,,5
NSLL,S,1
esln
BF,ALL,HGEN,2e7
allsel

LSEL,S,LINE,,18
NSLL,S,1
esln
BF,ALL,HGEN,1.8e7
allsel

LSEL,S,LINE,,1,2
lsel,a,,,16,17
lsel,a,,,19,23,4
lsel,a,8
NSLL,S,1
SF,ALL,CONV,12.5,20
ALLSEL

LSEL,S,,,5
LSEL,A,,,18,24,2
LSEL,A,,,11,12
lsel,a,,,27
SFL,ALL,RDSF,0.9,,1
ALLSEL

LSEL,S,,,13
LSEL,A,,,25,26
LSEL,A,,,28,30
SFL,ALL,RDSF,0.9,,2
ALLSEL
!********************
/AUX12  
STEF,0.567E-07  
TOFFST,273
RADOPT,0.1,0.1E,0,1000,0.1,0.1
SPCTEMP,1,500
SPCTEMP,2,500

HEMIOPT,1000,0.01
V2DOPT,1,20,0.E+00,200
VFOPT,NEW
FINISH

/solu
antype,static
time,1
DELTIM,0.1
solve