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[求助]
施加初始温度以及热对流荷载 瞬态分析后温度低于初始温度 怎么回事
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我做的大体积实体内部有热流管的瞬态温度分析 取对称实体模型 外表面热对流有sf,all,conv,20,20和sf,all,conv,2.5,20两种，热管热荷载sf,all,conv,50,180 其中热管总长一开始是10m 我施加荷载取一半5m，瞬态分析后发现大部分区域温度小于20度 求教哪出问题了 命令流如下 Finish /clear,all /config,nres,50000 /prep7 et,1,solid70 mp,kxx,1,2.5 !导热系数 mp,dens,1,2500 mp,c,1,.97e3 k,1,6.0 !点线面构建 k,2,6.5 k,3,6.7 k,4,7.0 k,5,6.5,0.1 k,6,6.6,0.1 k,7,6.7,0.1 k,8,6.0,0.5 k,9,6.5,0.5 k,10,7.0,0.5 k,11,0,0 k,12,0,17 k,13,6.0,17 k,14,7,17 k,15,21,17 k,16,21 k,17,0,0.5 k,18,21,0.5 k,19,6.5,17 l,1,2 l,2,5 l,5,6 l,6,7 l,7,3 l,3,4 l,4,10 l,10,9 l,9,8 l,8,1 l,5,8 l,6,9 l,7,10 l,11,1 l,8,17 l,17,11 l,17,12 l,12,13 l,13,8 l,13,19 l,19,9 l,19,14 l,14,10 l,4,16 l,16,18 l,18,10 l,18,15 l,15,14 al,1,2,11,10 al,3,12,9,11 al,4,13,8,12 al,6,7,13,5 al,14,10,15,16 al,15,19,18,17 al,9,21,20,19 al,8,23,22,21 al,7,24,25,26 al,26,27,28,23 aglue,all numcmp,area allsel,all vext,all,,,,,-10 lsel,s,line,,2,5,1 !划分线 lesize,all,,,1 lsel,s,line,,1,6,5 lsel,a,line,,11,13,1 lesize,all,,,2,1 lsel,s,loc,z,0 lsel,u,line,,1,6,1 lsel,u,line,,11,13,1 lesize,all,0.5,,,,1 lsel,all lsel,u,loc,z,0 lsel,u,loc,z,-10 lesize,all,0.5,,,,1 mshape,0,3d mshkey,1 type,1 vmesh,all /pnum,node,0 /pnum,elem,0 /view,1,1,1,1 eplot allsel nummrg,all numcmp,all eplot finish /solu !热分析求解 antype,trans timint,on autots,on outres,,all time,18000 deltim,360,360,2000 bfunif,temp,20 kbc,1 autots,on asel,s,loc,x,0 asel,a,loc,x,21 asel,a,loc,z,0 nsla,s,1 sf,all,conv,20,20 allsel,all asel,s,loc,y,17 asel,a,loc,z,-10 nsla,s,1 sf,all,conv,2.5,20 allsel asel,s,loc,x,6.5,6.7 asel,u,loc,y,0.2,17 nsla,s,1 nsel,r,loc,z,0,-5 sf,all,conv,50,180 allsel,all eqslv,jcg outpr,basic,all solve finish /post1 set,last plnsol,temp |
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2楼2013-11-26 10:09:32
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材料 我取的混凝土 单位是米 比热是0.97e3 单位都取的国际单位 不过昨天命令流单元划分我又改了下 就改了一句 单元尺寸为1m的我改成0.5m 具体如下： Finish /clear,all /config,nres,50000 /prep7 et,1,solid70 mp,kxx,1,2.5 !导热系数 mp,dens,1,2500 mp,c,1,0.97e3 k,1,6.0 !点线面构建 k,2,6.5 k,3,6.7 k,4,7.0 k,5,6.5,0.1 k,6,6.6,0.1 k,7,6.7,0.1 k,8,6.0,0.5 k,9,6.5,0.5 k,10,7.0,0.5 k,11,0,0 k,12,0,17 k,13,6.0,17 k,14,7,17 k,15,21,17 k,16,21 k,17,0,0.5 k,18,21,0.5 k,19,6.5,17 l,1,2 l,2,5 l,5,6 l,6,7 l,7,3 l,3,4 l,4,10 l,10,9 l,9,8 l,8,1 l,5,8 l,6,9 l,7,10 l,11,1 l,8,17 l,17,11 l,17,12 l,12,13 l,13,8 l,13,19 l,19,9 l,19,14 l,14,10 l,4,16 l,16,18 l,18,10 l,18,15 l,15,14 al,1,2,11,10 al,3,12,9,11 al,4,13,8,12 al,6,7,13,5 al,14,10,15,16 al,15,19,18,17 al,9,21,20,19 al,8,23,22,21 al,7,24,25,26 al,26,27,28,23 aglue,all numcmp,area allsel,all vext,all,,,,,-10 lsel,s,line,,2,5,1 !划分线 lesize,all,,,1 lsel,s,line,,1,6,5 lsel,a,line,,11,13,1 lesize,all,,,2,1 lsel,s,loc,z,0 lsel,u,line,,1,6,1 lsel,u,line,,11,13,1 lesize,all,0.5,,,,1 lsel,all lsel,u,loc,z,0 lsel,u,loc,z,-10 lesize,all,0.5,,,,1 mshape,0,3d mshkey,1 type,1 vmesh,all /pnum,node,0 /pnum,elem,0 /view,1,1,1,1 eplot allsel nummrg,all numcmp,all eplot finish /solu !热分析求解 antype,trans timint,on autots,on outres,,all time,18000 deltim,500,500,2000 bfunif,temp,20 kbc,1 autots,on asel,s,loc,x,0 asel,a,loc,x,21 asel,a,loc,z,0 nsla,s,1 sf,all,conv,20,20 allsel,all asel,s,loc,y,17 asel,a,loc,z,-10 nsla,s,1 sf,all,conv,2.5,20 allsel asel,s,loc,x,6.5,6.7 asel,u,loc,y,0.2,17 nsla,s,1 nsel,r,loc,z,0,-5 sf,all,conv,50,180 allsel,all eqslv,jcg outpr,basic,all solve finish /post1 set,last plnsol,temp |
3楼2013-11-26 11:13:17
