目标：对空心圆柱内表面施加10MPa压力
描述：对空心圆柱表面进行skin分组，外表面为east,内表面为west,两端分别为north 和south，然后对内表面west施加应力10MPa。
查看applied force时，只在y=1平面显示了该压力。
问题：此时是否达到了内表面整体加压力的效果？如果没有，该如何修改命令呢？
附命令：
model new
zone create cylindrical-shell point 0 0 0 0 point 1 2 0 0 point 2 0 60 0 point 3 0 0 2 size 1 60 6 2 dimension 1 1 1 1 ratio 1 1 1 1 group 'guanbi' fill on group 'kaiwa'
zone reflect normal (-1,0,0) origin (0,0,0)
zone reflect normal (0,0,-1) origin (0,0,0)
zone cmodel assign elastic range group 'guanbi'
zone cmodel assign null range group 'kaiwa'
zone face skin
;zone face group '1' range group 'guanbi'
zone initialize density 7850 range group 'guanbi'
;zone initialize density 1868 range group 'kaiwa'
zone property bulk 2.06e11 she 8e10 range group 'guanbi'
;zone property bulk 5.17e6 she 2.38e6 fric 21 coh 1e4 tens 1680 range group 'kaiwa'
zone face apply stress-normal -1e7 range group 'West'
;
model gravity 0 0 -9.8
zone gridpoint fix velocity-y range position-y -0.1 0.1
zone gridpoint fix velocity-y range position-y 59.9 60.1
;model solve
;model save 'test1'
