凝固分析实例-与帮助文件相比,其创建了分析模型.doc

实例2:多了创建模型和命令流文件参照这个操作步骤翻译一钢铸件及其砂模的横截而尺寸如图所示：砂模的热物理性能如下表所示:单位制导热系数(KXX)Btu/hr.in.°F0.025密度(DENS)lbm/in30.254比热(C)Btu/lbm.°F0.28铸钢的热物理性能如下表所示:单位制0°F2643°F2750°F2875°F导热系数Btu/hr.in.°F1.441.541.221.22焙Btu/in30128.1163.8174.2初始条件:铸钢的温度为2875°F,砂模的温度为80°F；砂模外边界的对流边界条件：对流系数0.014Btu/hr.in2.°F,空气温度80°F； 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,l,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,2,0,128.1,163.8,174.2 mpplot,kxx,2mpplot,enth，2 save!创建几何模型 k,l,OQO ^2,22,0,0k,3,10,12,0k,4,0,12,0 /pnu m,kp,l /pnumji ne,l /pnu m,area,l /Triad,Itop kplota,1,2,3,4 saverectng,4,22,4,8 aplotaovlap,all adele,3aplotsave!划分网格esize,1 amesh,5mat,2 aplotamesh,4 eplot/pnu m,elem /nu mbe^l save!进入加载求解/SOLU!设定为瞬态分析!设定铸钢的初始温度!设定砂模的初始温度an type,tra ns esel，s‘mat:〃 2 nsle,s/replot Call,temp,2875 esel,i nvensle,s/replot Call‘ternp‘80 allselsaveIplotsflJ,CONV,0.014〃80sfl,3,CONV,0.014〃80sfl4CONV,0.014〃80/psf,conv,2time,3kbc,lautots,ondeltim,0.01,0.001,0.25timint, ontintp 〃〃:1outres,all,allsolve!进入后处理/post26/pnum’no de,l/nu mbe^Oeplotnsol,2,204,temp,centerplvar,2!设定砂模外边界対流!设定瞬态分析吋间!设定为阶越的载荷!打开自动时间步长!设定时间步长!打开时间积分!将THETA设定为1!输入每个了步的结果!设定铸钢中心点温度随时间的变屋!绘制温度〜吋间曲线save finish菜单操作：1. Utility Menu>File>Change Title,输入 Casting Solidification;2. 定义单元类型:Main Menu>Preprocessor>Element Type>Add/Edit/Delete, Add, Quad 4node 55；3. 定义砂模热性能:Main Menu>Preprocessor>Material Props>lsotropicz 默认材料编号 1,在 Density(DENS)框中输入 0.054,在 Thermal conductivity (KXX)框中输入 0.025,在 Specific heat(C)框中输入0.28;4. 怎义铸钢热性能温度表:Main Menu>Preprocessor>Material Props>-Temp Dependent->Temp Table,输入 Tl=0,T2=2643, T3=2750, T4=2875;5. 怎义铸钢热性能:Main Menu>Preprocessor>Material Props>-Temp Dependent ->Prop Table, 选择 Th Conductivity,选择 KXX,输入材料编号 2,输入 Cl=1.44z C2=1.54, C3=1.22, C4=1.22,选 择 Apply,选择 Enthalpy,输入 Cl=0, C2=128.1Z C3=163.8, C4=174.2;6. 创建关键点:Main Menu>Preprocessor>-Modeling->Create>Keypoints>ln Active CS,输入关键 点编号1,输入坐标0Q0,输入关键点编号2,输入坐标22,0,0,输入关键点编号3,输入坐 标10,12,0,输入关键点编号4,输入坐标0,12,0;7. 创建儿何模型:Main Menu>Preprocessor>-Modeling->Create>-Areas->Arbitrary>Through KPs,顺序选取关键点1,2,3,4;8. Main Menu>Preprocessor>・Modeling・>Create>・Areas・>Rectangle>By Dimension,输入X1=4/X2=22,Y1=4ZY2=&9. 进行布尔操作:Main Menu>Preprocessor>-Modeling->Operate>-Booleans->Overlap>Area,Pick all；10. 删除多余面:Main Menu>Preprocessor>・Modeling・>Delete>Area and Below,311. 保存数据库:在Ansys Toolbar中选取SAVE_DB;12. 定义单元大小:Main Menu>Preprocessor>-Meshing->Size Cntrls>-Global->Sizez 在 Element edge length框中输入1;13. 对砂模划分网格:Main Menu>Preprocessor>-Meshing->Mesh>-Areas->Free/选择砂模;14. 对铸钢划分网格:Main Menu>Preprocessor>-Attributes->Define>Default Attribs,在 Material number菜单中选择2;15. Main Menu>Preprocessor>・Meshing->Mesh>・Areas・>Free,选择铸钢；16. 定义分析类型:Main Menu>Solution>-Analysis Type->New Analysis,选择 Transient;17. 选择铸钢上的节点:Utility Menu>Select>Entitiesz 选择 element,mat,输入 2,选择 Apply,选择 no de, attached to eleme nt,选择 OK;1& 定义铸钢的初始温度:Main Menu>Solution>-Loads->Apply>lnitial Condit,n>Define/ 选择 Pick all,选择 temp,输入 2875, OK;19. 选择砂模上的节点:Utility Menu>Select>Entities,Nodes, inverse20. 定义砂模的初始温度:Main Menu>Solution>-Loads->Apply>lnitial Condit,n>Define/ 选择 Pick all,选择 temp,输入 80, OK;21. Utility Menu>Select>Everything；22. Utility Menu>Plot>Lines；23. 定义对流边界条件： Main Menu>Solution>-Loads->Apply>-Thermal->Converction>On Lines,选择砂模的三个边界1,3,4,在file coefficent框中输入80,在Bulk temperature fr：中 输入,80;24. 设定瞬态分析时间选项：Main Menu>Solution>Load Step Opts>Time/Frequenc>Time・Time Step,Time at end of load step 3Time Step size 0.01Stepped or ramped b.c. SteppedAutomatic time stepping onMinimun time Step size 0.001Maximum time step size0.2525. 设置输出:Main Menu>Solution>Load Step Opts>Output Ctrls>DB/Results File,在 File writefrequency 框中选择 Every substep;26. 求解:Main Menu>Solution>-Solve->Current LS；27. 进入后处理：Main Menu>Timehist Post proc；28. 定义铸钢中心节点的温度变量:Main Menu>Timehist PostprooDefine Variables, Add,Nodal DOF result,2,204；29. 绘制节点温度随时间变化曲线:Main Menu>Timehist PostprooGraph Variable,2o。