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[求助] 请教ansys大神一个问题,用ansys算一个流体分析,发现总是显示错误

请教ansys大神一个问题,用ansys算一个流体分析,发现总是显示错误:the degree of freedom solution is not avaliable
命令流如下:
FINISH
/CLEAR
/TITLE, flow-plate
/PREP7

k,1,0,0,0
k,2,10,0,0
k,3,10,0.1,0
k,4,0,0.1,0

lstr,1,2        !L1
lstr,2,3        !L2
lstr,4,3        !L3
lstr,4,1        !L4
al,1,2,3,4
lesize,all,0.01,,,,,,,
et,1,fluid141              
MP,DENS,1,1000        
MP,visc,1,0.001

type,1
mat,1
amesh,1
dl,1,1,vx,0
dl,1,1,vy,0
dl,3,1,vx,0
dl,3,1,vy,0
dl,4,1,vx,0.00005
dl,4,1,vy,0
dl,2,1,pres,0
finish
/solu
fldata7,prot,dens,constant
fldata7,prot,visc,constant
fldata8,nomi,dens,1000
fldata8,nomi,visc,0.001
fldata1,solu,tran,f
fladata1,exec,300
solve
/post1
plnsol,v,x,,,

请大神指导!
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