pilgrimage 发表于 2006-1-6 20:57:27

请教大家一个问题：关于flotran的

具体是一个固体热源放置于空气流场中
希望得到一个热源附近的流场分布

但是在仿真运行是出现下面图片中的现象
希望哪位大侠帮我指点迷津 谢谢谢谢了

pilgrimage 发表于 2006-1-6 20:59:38

Re:请教大家一个问题：关于flotran的

命令流如下：

/title,temperature redistribution in gas flow
/prep7
et,1,141 ! 2D Cartesian system
mshape,1,2D ! 2D triangle elements
rectng,,500,,50
rectng,249,251,24.5,25
rectng,249,251,25,25.004
rectng,249,251,25.004,25.0055
rectng,249,251,25.0055,25.0058
rectng,249.975,250.025,25.004,25.0055
aovlap,all
nummrg,all
numcmp,all
lsel,s,,,1,3,2
lesize,all,,,100,-0.2
lsel,s,,,2,4,2
lesize,all,,,10,-5
lsel,s,,,5,9,2
lesize,all,,,100,-0.2
lsel,s,,,6,8,2
lesize,all,,,3
lsel,s,,,20,21,1
lesize,all,,,4
lsel,s,,,14,17,3
lesize,all,,,3
lsel,s,,,11,13,2
lesize,all,,,3
lsel,s,,,10,12,2
lesize,all,,,5
lsel,s,,,15,16,1
lesize,all,,,50
lsel,s,,,18,19,1
lesize,all,,,50
lsel,s,,,22,23,1
lesize,all,,,1
allsel
mat,2
amesh,2
amesh,3
amesh,4
mat,3
amesh,5
mat,4
amesh,6
mat,2
amesh,1
mat,1
amesh,7
!inlet
lsel,s,,,4
nsll,s,0
d,all,temp,293
d,all,vx,1000
d,all,vy,0
!outlet
lsel,s,,,2
nsll,s,0
d,all,pres,0
lsel,s,,,1,3,2
nsll,s,1
d,all,vx,0
d,all,vy,0
lsel,s,,,5
nsll,s,0
d,all,vx,0
d,all,vy,0
lsel,s,,,9
nsll,s,1
d,all,vx,0
d,all,vy,0
lsel,s,,,6,8,2
nsll,s,0
d,all,vx,0
d,all,vy,0
lsel,s,,,20,21,1
nsll,s,1
d,all,vx,0
d,all,vy,0
lsel,s,,,14,17,3
nsll,s,0
d,all,vx,0
d,all,vy,0
lsel,s,,,22,23,1
nsll,s,1
d,all,vx,0
d,all,vy,0
asel,s,,,2,,,1
nsll,s,1
d,all,temp,373
allsel
!solid properties
mp,dens,2,2.3e-3
mp,kxx,2,0.157
mp,c,2,0.7
mp,dens,3,2.27e-3
mp,kxx,3,0.0014
mp,c,3,1
mp,dens,4,3.1e-3
mp,kxx,4,0.019
mp,c,4,0.69
/SOLU
FLDATA1,SOLU,TEMP,T
FLDATA2,ITER,EXEC,20
FLDATA2,ITER,OVER,10
FLDATA2,ITER,APPE,10
FLDATA12,PROP,DENS,4
FLDATA13,VARY,DENS,1
FLDATA12,PROP,VISC,4
FLDATA13,VARY,VISC,0
FLDATA12,PROP,COND,4
FLDATA13,VARY,COND,0
FLDATA12,PROP,SPHT,4
FLDATA13,VARY,SPHT,0
FLDATA7,PROT,DENS,AIR-MM
FLDATA7,PROT,VISC,AIR-MM
FLDATA7,PROT,COND,AIR-MM
FLDATA7,PROT,SPHT,AIR-MM
ALLSEL,ALL
FINI

gxx917 发表于 2006-1-6 23:41:08

Re:请教大家一个问题：关于flotran的

有可能是约束加载的问题，我也遇到过类似问题！

pilgrimage 发表于 2006-1-7 15:07:04

Re:请教大家一个问题：关于flotran的

那么你后来是调整了约束就好了吗？？

dbright 发表于 2006-1-10 21:34:42

Re:请教大家一个问题：关于flotran的

CG method 应该是conjugate gradient(共轭梯度法求解法），可尝试选择其他求解器，使用以下设置，即在你的命令流后加上以下命令，可以求解，但是结果是否正确，要你自己判断。

FLDATA18,METH,TEMP,3
FLDATA22,MAXI,TEMP,1000,
FLDATA20,SRCH,TEMP,2,   
FLDATA21,CONV,TEMP,1e-012,
FLDATA23,DELT,TEMP,1e-010,
solve
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