ANSYS瞬态热实例.doc

实例1:一个30公斤重、温度为70的铜块,以及一个20公斤重、温度为80的铁块，突然放入温度为20、盛满了300升水的、完全绝热的水箱中,如图所示。过了一个小时，求铜块与铁块的最高温度(假设忽略水的流动)。材料热物理性能如下:热性能单位制铜铁水导热系数W/m38370.61密度Kg/m388897833996比热J/kg3904484185以下列出log文件及菜单操作说明/filename,transient1/title, Thermal Transient Exercise 1!进入前处理/prep7et,1,plane77! 定义单元类型mp,kxx,1,383! 定义材料热性能参数mp,dens,1,8889!1铜，2铁，3水mp,c,1,390mp,kxx,2,70mp,dens,2,7837mp,c,2,448mp,kxx,3,0.61mp,dens,3,996mp,c,3,4185rectnag,0,0.6,0,0.5!创建几何实体rectang,0.15,0.225,0.225,0.27rectang,0.6-0.2-0.058,0.6-0.2,0.225,0.225+0.044aovlap,all!布尔操作/pnum,area,1aplotaatt,1,1,1!划分网格eshape,2esize,0.02amesh,2aatt,2,1,1amesh,3aatt,3,1,1eshape,3esize,0.05amesh,4/pnum,mat,1eplotfinish!加载求解/soluantype,transtimint,off!先作稳态分析,确定初始条件time,0.01!设定只有一个子步的时间很小的载荷步deltim,0.01esel,s,mat,3nsle,sd,all,temp,20esel,s,mat,2nsle,sd,all,temp,80esel,s,mat,1nsle,sd,all,temp,70allselsolve!得到初始温度分布time,3600!进行瞬态分析timint,on!打开时间积分deltim,26,2,200!设置时间步长，最大及最小时间步长autots,on!打开自动时间步长ddelet,all,temp!删除稳态分析中定义的节点温度outres,all,1!将每个子步的值写入数据库文件solvefinishsave!进入POST26后处理/post26solu,2,dtime,dtime!2每一子步采用的时间步长nsol,3,node(0.1875,0.2475,0),temp,T_Copper!3铜块的中心点nsol,4,node(0.371,0.247,0),temp,T_Iron!4铁块的中心点nsol,5,node(30,0,0),temp,T_H2O_Bot!5水箱的底部nsol,6,node(30,50,0),temp,T_H2O_Top!6水箱的顶部nsol,7,node(0,25,0),temp,T_H2O_Left!7水箱的左部nsol,8,node(60,25,0),temp,T_H2O_Right!8水箱的右部Plvar,2plvar,3,4,5,6,7,8finish!进入POST1后处理/post1!设置为最后一个载荷子步set,lastesel,s,mat,1nsle,splnsol,tempesel,s,mat,2nsle,splnsol,tempfinish实例2:一钢铸件及其砂模的横截面尺寸如图所示:砂模的热物理性能如下表所示:单位制导热系数(KXX)Btu/hr.in.oF0.025密度(DENS)lbm/in30.254比热(C)Btu/lbm.oF0.28铸钢的热物理性能如下表所示:单位制0oF2643oF2750oF2875oF导热系数Btu/hr.in.oF1.441.541.221.22焓Btu/in30128.1163.8174.2初始条件:铸钢的温度为2875oF，砂模的温度为80oF；砂模外边界的对流边界条件：对流系数0.014Btu/hr.in2.oF，空气温度80oF；求3个小时后铸钢及砂模的温度分布。/Title, Casting Solidification!进入前处理/prep7et,1,plane55！定义单元mp,dens,1,0.054！定义砂模热性能mp,kxx,1,0.025mp,c,1,0.28mptemp,1,0,2643,2750,2875！定义铸钢的热性能mpdata,kxx,2,1.44,1.54,1.22,1.22mpdata,enth,2,0,128.1,163.8,174.2mpplot,kxx,2mpplot,enth,2save！创建几何模型k,1,0,0,0k,2,22,0,0k,3,10,12,0k,4,0,12,0/pnum,kp,1/pnum,line,1/pnum,area,1/Triad,ltopkplota,1,2,3,4saverectng,4,22,4,8aplotaovlap,alladele,3aplotsave！划分网格esize,1amesh,5mat,2aplotamesh,4eplot/pnum,elem/number,1save！进入加载求解/SOLUantype,trans！设定为瞬态分析esel,s,mat,2！设定铸钢的初始温度nsle,s/replotic,all,temp,2875esel,inve！设定砂模的初始温度nsle,s/replotic,all,temp,80allselsavelplotsfl,1,CONV,0.014,80！设定砂模外边界对流sfl,3,CONV,0.014,80sfl,4,CONV,0.014,80/psf,conv,2time,3！设定瞬态分析时间kbc,1！设定为阶越的载荷autots,on！打开自动时间步长deltim,0.01,0.001,0.25！设定时间步长timint,on！打开时间积分tintp,1！将THETA设定为1