FLOTRAN 热 流固耦合分析 问题

ixxing

分析出现了问题：
Coefficient matrix has a negative diagonal.
Probably indicates

• divergent solution.

~PARAIN,'a','x_t','G:\',SOLIDS,0,0
/NOPR   
/GO
/FACET,NORML
/prep7
/title,SPS thermal analysis for fluid solid coupled
vplot

et,1,142

mp,kxx,1,0.613
mp,kxx,2,390
vglue,all

vsel,s,,,6,9,1
vatt,1,,1,0

vsel,s,,,10
vatt,2,,1,0
allsel,all
smart,6
MSHAPE,1,3D
MSHKEY,0
vmesh,all

fldata1, solu, temp, 1   ! Set solution option to thermal
fldata1, solu, flow, 1
fldata1, solu, turb, 1
fldata2, iter, exec, 200   ! Set FLOTRAN execution control
fldata2, iter, over, 50
!fldata5, outp, sumf, 50

!fldata13, vary, dens, 1   ! Set fluid properties
fldata7, prot, dens, constant
fldata8, Nomi, dens, 997

fldata7, prot, visc, constant
fldata8, Nomi, visc, 8.55e-4

fldata7, prot, cond, constant
fldata8, nomi, cond, 0.613

fldata7, prot, spht, constant
fldata8, nomi, spht,4179
!
fldata24, turb, modl,2
fldata24,turb, rati,2

acel, 0, 9.81, 0    ! Set flow environment gravity
!fldata18, meth, pres, 1
!fldata19, tdma, pres, 100
fldata18, meth, temp, 4   !设置温度求解方式
FLDATA,ALGR,SEGR,SIMPLEN
FLDATA,ALGR,HFLM,MATX  

FLST,5,4,5,ORDE,4   
FITEM,5,36  
FITEM,5,42  
FITEM,5,48  
FITEM,5,54  
CM,_Y,AREA  
ASEL,R, , ,P51X
CM,_Y1,AREA
CMSEL,S,_Y  
CMDELE,_Y   

DA,_Y1,VZ,20,1
Da,all,temp,20
allsel,all
!DA,_Y1,temp,25,1

FLST,5,4,5,ORDE,4   
FITEM,5,35  
FITEM,5,41  
FITEM,5,47  
FITEM,5,53  
CM,_Y,AREA  
ASEL,R, , ,P51X
CM,_Y1,AREA
CMSEL,S,_Y  
CMDELE,_Y   
DA,_Y1,PRES,0,1  

asel,s,loc,y,0.21324E-01,0.21324E-01
SFA,all,,HFLUX,1e5

/SOL
ALLSEL,ALL  
solve   
FINISH  

ixxing

附件，文件

ixxing

分析 散热板 的 温度分布，热 流固耦合分析，使用，Fluid142 3D 单元

tommot222

很好很强大  学习一下

kexin25

学习学习，支持楼主

木鱼海花

回帖是种美德，这种好帖子怎能不回帖呢!




















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ixxing

这个图是我的边界条件，进口速度20m/s 温度是20度 出口压力为零

ixxing

重新划分一下网格，就有结果了，但是结果很不理想啊！需要调整网格！或者边界条件，我在继续！

sigh08

8# ixxing

加油！！！

妖精蓝

楼主很好，楼主很好啊