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wuhaitao9029

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专业: 金属结构材料

[求助] 使用生死单元的喷涂模拟中死单元的数值为什么会变化呢？

做的等离子喷涂模拟，三种材料，各自赋有初始温度条件，我时间步按照1s设置，感觉不收敛，我就给了一个初始的0.001s，但是我用生死单元的时候，就会出现，还没激活的死单元的温度条件发生了变化。求大家帮忙看下，是哪里出现的问题。
/PREP7
!*
ET,1,PLANE13
!*
KEYOPT,1,1,4
KEYOPT,1,2,0
KEYOPT,1,3,1
KEYOPT,1,4,0
KEYOPT,1,5,0
!*
MP,DENS,1,2715
MP,KXX,1,221.5
MP,C,1,921
MP,EX,1,0.689E11
MP,PRXY,1,0.33
MP,ALPX,1,23.6E-6
MP,DENS,2,7320
MP,KXX,2,4.3
MP,C,2,501
MP,EX,2,2.25E11
MP,PRXY,2,0.30
MP,ALPX,2,14E-6
MP,DENS,3,6037
MP,KXX,3,1.5
MP,C,3,500
MP,EX,3,0.53E11
MP,PRXY,3,0.25
MP,ALPX,3,7.2E-6
*SET,Sub_length,0.025
*SET,Sub_height,0.002
*SET,Coat_height,0.0005
*SET,Metallic_height,0.0001
*SET,YSZ_height, Coat_height- Metallic_height
*SET,Coat_layer,10
*SET,Sub_layer,5
*SET,Single_height, Coat_height /Coat_layer
*SET,Ta,300
*SET,Ha,8
*SET,Tg_metallic,723
*SET,Tg_YSZ,748
*SET,Hg,320
*SET,dt,1e-7
*SET,Inittemp_sub,300
*SET,Inittemp_metallic,1673
*SET,Inittemp_YSZ,2478
*SET,Single_time,10
K,1,0,0
K,2,25e-3,0
K,3,25e-3,2e-3
K,4,0,2e-3
K,5,0,2.1e-3
K,6,25e-3,2.1e-3
K,7,25e-3,2.5e-3
K,8,0,2.5e-3
A,1,2,3,4
A,3,4,5,6
A,5,6,7,8
Aglue,all
Numcmp,all
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
APLOT
/PNUM,KP,0
/PNUM,LINE,0
/PNUM,AREA,1
/PNUM,VOLU,0
/PNUM,NODE,0
/PNUM,TABN,0
/PNUM,SVAL,0
/PNUM,DOMA,0
/NUMBER,0
!*
/PNUM,ELEM,0
/REPLOT
!*
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
FINISH
/SOL
FINISH
/PREP7
CM,_Y,AREA
ASEL, , , ,    1
CM,_Y1,AREA
CMSEL,S,_Y
!*
CMSEL,S,_Y1
AATT,    1, , 1,    0,
CMSEL,S,_Y
CMDELE,_Y
CMDELE,_Y1
!*
CM,_Y,AREA
ASEL, , , ,    2
CM,_Y1,AREA
CMSEL,S,_Y
!*
CMSEL,S,_Y1
AATT,    2, , 1,    0,
CMSEL,S,_Y
CMDELE,_Y
CMDELE,_Y1
!*
CM,_Y,AREA
ASEL, , , ,    3
CM,_Y1,AREA
CMSEL,S,_Y
!*
CMSEL,S,_Y1
AATT,    3, , 1,    0,
CMSEL,S,_Y
CMDELE,_Y
CMDELE,_Y1
!*
LESIZE,1,,,250
LESIZE,3,,,250
LESIZE,6,,,250
LESIZE,9,,,250
LESIZE,2,,,5
LESIZE,4,,,5
LESIZE,7,,,2
LESIZE,5,,,2
LESIZE,8,,,8
LESIZE,10,,,8
MSHAPE,0,2D
MSHKEY,1
!*
FLST,5,3,5,ORDE,2
FITEM,5,1
FITEM,5,-3
CM,_Y,AREA
ASEL, , , ,P51X
CM,_Y1,AREA
CHKMSH,'AREA'
CMSEL,S,_Y
!*
AMESH,_Y1
!*
CMDELE,_Y
CMDELE,_Y1
CMDELE,_Y2
!*
/FOC,1,-0.3,,,1
/REP,FAST
/FOC,1,-0.3,,,1
/REP,FAST
/FOC,1,-0.3,,,1
/REP,FAST
/FOC,1,-0.3,,,1
/REP,FAST
/FOC,1,-0.3,,,1
/REP,FAST
/FOC,1,-0.3,,,1
/REP,FAST
/FOC,1,-0.3,,,1
/REP,FAST
/FOC,1,-0.3,,,1
/REP,FAST
/FOC,1,-0.3,,,1
/REP,FAST
/FOC,1,-0.3,,,1
/REP,FAST
/FOC,1,-0.3,,,1
/REP,FAST
/FOC,1,-0.3,,,1
/REP,FAST
/FOC,1,-0.3,,,1
/REP,FAST
/FOC,1,-0.3,,,1
/REP,FAST
/FOC,1,-0.3,,,1
/REP,FAST
/FOC,1,-0.3,,,1
/REP,FAST
/FOC,1,-0.3,,,1
/REP,FAST
/FOC,1,-0.3,,,1
/REP,FAST
/FOC,1,-0.3,,,1
/REP,FAST
/FOC,1,-0.3,,,1
/REP,FAST
/FOC,1,-0.3,,,1
/REP,FAST
/FOC,1,-0.3,,,1
/REP,FAST
NSEL,S,LOC,Y,0
SF,ALL,CONV,Ha,Ta
ALLSEL,ALL
NSEL,S,LOC,Y,0,Sub_height
IC,ALL,TEMP, Inittemp_sub
ALLSEL,ALL
NSEL,S,LOC,Y,Sub_height+dt,Sub_height+Metallic_height
IC,ALL,TEMP, Inittemp_metallic
ALLSEL,ALL
NSEL,S,LOC,Y,Sub_height+ Metallic_height+dt,Sub_height+Coat_height
IC,ALL,TEMP, Inittemp_YSZ
ALLSEL,ALL
FINISH
/SOLU
!*
ANTYPE,4
!*
TRNOPT,FULL
LUMPM,0
!*
NSUBST,500,1000,200
OUTRES,ERASE
OUTRES,ALL,50
NSEL,S,LOC,Y, Sub_height, Sub_height +Coat_height
ESLN,S,1
EKILL,ALL
ESEL,S,LIVE
EPLOT
*DO,i, 1,Coat_layer,1
TIME,Single_time*(i-1)+0.001
NSEL,S,LOC,Y, Sub_height+Single_height*(i-1),Sub_height +Single_height*i
ESLN,S,1
EALIVE,ALL
ALLSEL,ALL
NSEL,S,LOC,Y, Sub_height +Single_height*i
SF,ALL,CONV,Hg,Tg_metallic
ALLSEL,ALL
NSEL,S,LOC,Y, Sub_height +Single_height*(i-1)
SFDELE,ALL,CONV
ALLSEL,ALL
SOLVE
TIME,Single_time*i
SOLVE
ESEL,S,LIVE
EPLOT
*ENDDO
ESEL,S,LIVE
EPLOT
FINISH

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1楼 2013-11-20 14:44:34

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wuhaitao9029

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引用回帖:

2楼: Originally posted by htbbzzg at 2013-11-20 18:48:30
在 ANSYS 中，死单元实际上也参加计算，只是 ANSYS 把死单元的主要材料性能设置的很小，以基本不影响周围的单元 (反之则不然)，因此，分析后，死单元的自由度 (热 - 温度；结构 - 位移，等) 也是会改变的。

那么怎么能将死单元的改变降到最低呢？

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3楼2013-11-20 19:16:10

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htbbzzg

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【答案】应助回帖

感谢参与，应助指数 +1

在 ANSYS 中，死单元实际上也参加计算，只是 ANSYS 把死单元的主要材料性能设置的很小，以基本不影响周围的单元 (反之则不然)，因此，分析后，死单元的自由度 (热 - 温度；结构 - 位移，等) 也是会改变的。

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2楼2013-11-20 18:48:30

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