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我现在需要模拟两个物体之间的热传导,我给两个物体之间创建了接触单元,在两物体外表面上施加空气对流载荷,两物体接触部分表面定义接触热传导系数,
给物体一施加27°,物体二施加83.3°。求解的结果显示两物体的温度都不变,根本就没有传热。是怎么回事?
命令流如下:
Finish
~PARAIN,'ballscrew','x_t',,SOLIDS,0,0 !导入实体模型(x_t格式)
/NOPR
/GO
/FACET,NORML
/REPLOT
/title,Thermal Analysis of Ballscrew
/prep7
et,1,solid70
mptemp,,,,,,,,
mptemp,1,0
mpdata,ex,1,,2.1e11
mpdata,prxy,1,,0.3
mpdata,dens,1,,7820
mpdata,c,1,,460
mpdata,kxx,1,,36.5
uimp,1,reft,,,20
mpdata,alpx,1,,1.12e-5
esize,0.002
MSHKEY,0
MSHAPE,1,3d
!自由网格划分
vmesh,1
esize,0.002
MSHKEY,0
MSHAPE,1,3d
vmesh,2
esize,0.002
MSHKEY,0
MSHAPE,1,3d
vmesh,3,6
/VIEW,1,1
/ANG,1
/REP,FAST
Asel,s,,,44 !螺母内表面
Nsla,s,1
Cm,plate1,node !生成第一个节点组件
Allsel
Asel,s,,,5 !丝杠外表面
Nsla,s,1
Cm,shaft1,node !生成第一个节点组件
Allsel
R,3
Real,3
et,2,170
et,3,174
Nsel,s,,,plate1
Type,2
Esln,s,0
Esurf,all
Allsel
Nsel,s,,,shaft1
Type,3
Esln,s,0
Esurf,all
Allsel
KEYOPT,3,1,2
KEYOPT,3,2,2
KEYOPT,3,4,2
KEYOPT,3,5,1
KEYOPT,3,6,0
KEYOPT,3,7,0
KEYOPT,3,8,0
KEYOPT,3,9,2
KEYOPT,3,10,0
KEYOPT,3,11,0
KEYOPT,3,12,4
KEYOPT,3,14,0
Finish
/solu !进入求解器
Antype,trans !定义为瞬态分析
Timint,on !时间积分
Nropt,full !使用完全的NR法
Autots,on
Time,100 !指定求解时间
Deltim,20,20,50 !定义时间子步
kwpave,44,59 !坐标系偏移(点44和59的中间位置)
wprota,0,0,180 !绕Y轴旋转180°
wpoffs,0,0,0.146 !沿转后的Z轴平移0.146
cswpla,11,1,1,1 !定义局部柱坐标系
csys,11
asel,s,area,,2,10
asel,a,area,,12,13
asel,a,area,,22,32
asel,a,area,,37,43
asel,a,area,,45,50,5
asel,a,area,,48,49
asel,a,area,,54,56
asel,a,area,,60,62
asel,a,area,,66,68
nsla,s,1
sf,all,conv,3.5,20 !在丝杠外表面上施加空气对流载荷
Allsel
asel,s,area,,1,11,10
asel,a,area,,14,21
nsla,s,1
sf,all,conv,532.7,20 ! 在丝杠内表面上施加水的对流载荷
allsel
nsel,s,loc,x,0.015
nsel,r,loc,z,-0.066,-0.036
sfdele,all, conv
allsel
nsel,s,loc,x,0.015
nsel,r,loc,z,1.232,1.262 !删去轴承处空气对流换热系数
sfdele,all,conv
Allsel
nsel,s,loc,x,0.015
nsel,r,loc,z,-0.066,-0.036 !删去轴承处空气对流换热系数
sf,all,conv,150,20
Allsel
nsel,s,loc,x,0.015
nsel,r,loc,z,1.232,1.262 !施加轴承与丝杠处接触热传导系数
sf,all,conv,150,20
Allsel
nsel,s,loc,x,0.02
nsel,r,loc,z,0.46,0.685
sfdele,all,conv !删去螺母处空气对流换热系数
allsel
nsel,s,loc,x,0.02
nsel,r,loc,z,0.46,0.685 !施加螺母与丝杠处接触热传导系数
sf,all,conv,150,20
allsel
Vsel,s,volu,,1
Vsel,a,volu,,3,6
nslv,s,1
D,all,temp,27
allsel
Vsel,s,volu,,2
nslv,s,1
D,all,temp,83.3
allsel
Toffst,273
Outres,,all
solve
/post1
Plnsol,temp,,0, |