一个简单的例子,对称性是怎么体现的?

freemoon

长空心圆柱体热传导过程,采用1/4建摸,对内外半径施加温度载荷.内/外径温度均为为80度。

我想问对称性是从哪里体现出来的?开始选用plane55时，也没有设置keyopt(3)=1阿！
/似乎ansys自动默认没有定义载荷的另外两条边为对称面
这是怎么回事？谢谢
如果想更明确的表示出，两条直边是对称面，应该怎么做呢？
命令流：
/prep7
et,1,plane55
mp,kxx,1,70
pcirc,0.2,0.6,0,90
lsel,s,line,,1,3,2
lesize,all,,,20
lsel,s,line,,2,4,2
lesize,all,,,15,0.5   
amesh,1
fini
/solu
antype,static
lsel,s,line,,1
nsll,s,1
d,all,temp,80
allsel
lsel,s,line,,3
nsll,s,1
d,all,temp,20
allsel
outpr,basic,all
solve
/post1
plnsol,temp

iomega

If you don't apply boundary condition, ansys seems to put adiabatic condition on the line ( not the symmetry, though).  However, symmetry means dT/dx=0 which is adiabatic condition. So if you want to explicitly show the symmetry condition, just put hflux = 0 on those boundaries.

freemoon

got it,thx!