ANSYS热分析实例

带散热片的轴对称管练习12热分析November3,2003Inventory#001969W12-2INTRODUCTIONTOANSYS8.0-Part1INTRODUCTIONTOANSYS8.0INTRODUCTIONTOANSYS8.0INTRODUCTIONTOANSYS8.0---Part1Part1Part1WorkshopSupplement12.热分析带散热片的轴对称管说明•一个带散热片的管，在给定的荷载条件下，分析温度和热量分布（请看下一页）。•该模型是轴对称的。仅分析散热片的一半，模型的底部为对称约束。November3,2003Inventory#001969W12-3INTRODUCTIONTOANSYS8.0-Part1INTRODUCTIONTOANSYS8.0INTRODUCTIONTOANSYS8.0INTRODUCTIONTOANSYS8.0---Part1Part1Part1WorkshopSupplement12.热分析带散热片的轴对称管荷载外部对流系数=0.69e-4Tbulk=70FI内部对流系数=0.28e-3Tbulk=450F对称边界线November3,2003Inventory#001969W12-4INTRODUCTIONTOANSYS8.0-Part1INTRODUCTIONTOANSYS8.0INTRODUCTIONTOANSYS8.0INTRODUCTIONTOANSYS8.0---Part1Part1Part1WorkshopSupplement12.热分析带散热片的轴对称管1.按教师指定的工作目录，用“pipe-th”作为作业名，进入ANSYS。2.设定GUI选择为热分析:–MainMenuPreferences…•选择“Thermal”,然后按[OK]3.读入文件“pipe-th.inp”，创建2-D轴对称模型，在线上确定网格划分份数:–UtilityMenuFileReadInputfrom…•选择“pipe-th.inp”,然后按[OK]–或用命令:/INPUT,pipe-th,inpNovember3,2003Inventory#001969W12-5INTRODUCTIONTOANSYS8.0-Part1INTRODUCTIONTOANSYS8.0INTRODUCTIONTOANSYS8.0INTRODUCTIONTOANSYS8.0---Part1Part1Part1WorkshopSupplement12.热分析带散热片的轴对称管4.定义单元类型为PLANE55，设置keyopt(3)=axisymmetric:–MainMenuPreprocessorElementTypeAdd/Edit/Delete…•按[Add...]–拾取“ThermalSolid”和“Quad4node55”,然后按[OK]•选择[Options...]–设置K3=Axisymmetric,然后按[OK]•按[Close]–或用命令:ET,1,PLANE55,,,1November3,2003Inventory#001969W12-6INTRODUCTIONTOANSYS8.0-Part1INTRODUCTIONTOANSYS8.0INTRODUCTIONTOANSYS8.0INTRODUCTIONTOANSYS8.0---Part1Part1Part1WorkshopSupplement5.从材料库中读取材料特性，选择304无应变钢:–MainMenuPreprocessorMaterialPropsMaterialLibraryImportLibrary…•选择“BIN”,然后按[OK]]–向指导教师问询matlib的路径缺省路径为:C:\ProgramFiles\AnsysInc\V80\ANSYS\matlib•选择“Stl_AISI-304.BIN_MPL”,然后按[OK]•观察ansuitmp窗口•关闭ansuitmp窗口12.热分析带散热片的轴对称管November3,2003Inventory#001969W12-7INTRODUCTIONTOANSYS8.0-Part1INTRODUCTIONTOANSYS8.0INTRODUCTIONTOANSYS8.0INTRODUCTIONTOANSYS8.0---Part1Part1Part1WorkshopSupplement12.热分析带散热片的轴对称管6.用2-D四边形单元，并用映射网格划分单元：–MainMenuPreprocessorMeshingMeshTool•选择Global，按[Set]•设置SIZE=0.25/2,然后按[OK]•选择“Mapped”,然后按[Mesh]•按[PickAll]•按[Close]–或用命令:MSHAPE,0,2DMSHKEY,1ESIZE,0.25/2AMESH,ALLNovember3,2003Inventory#001969W12-8INTRODUCTIONTOANSYS8.0-Part1INTRODUCTIONTOANSYS8.0INTRODUCTIONTOANSYS8.0INTRODUCTIONTOANSYS8.0---Part1Part1Part1WorkshopSupplement12.热分析带散热片的轴对称管7.在实体模型的线上施加对流荷载–MainMenuSolutionDefineLoadsApplyThermalConvectionOnLines•拾取外边四条线(10,2,7,和6),然后按[OK]•设置VALI=0.69e-4，VAL2I=70,然后按[Apply]•拾取内部两条线(9和13),然后按[OK]•设置VALI=0.28e-3，VAL2I=450,然后按[OK]–UtilityMenuPlotLines–或用命令:/SOLUSFL,2,CONV,0.69e-4,,70SFL,6,CONV,0.69e-4,,70SFL,7,CONV,0.69e-4,,70SFL,10,CONV,0.69e-4,,70SFL,9,CONV,0.28e-3,,450SFL,13,CONV,0.28e-3,,450GPLOTNovember3,2003Inventory#001969W12-9INTRODUCTIONTOANSYS8.0-Part1INTRODUCTIONTOANSYS8.0INTRODUCTIONTOANSYS8.0INTRODUCTIONTOANSYS8.0---Part1Part1Part1WorkshopSupplement12.热分析带散热片的轴对称管8.保存数据库并求解：–Pickthe“SAVE_DB”buttonintheToolbar(orselect:UtilityMenuFileSaveasJobname.db)–MainMenuSolutionSolveCurrentLS•观察“/STATUSCommand”窗口，然后关闭它•按[OK]•按[Close]-求解完成后关闭黄色信息框–或用命令:SAVE/SOLUSOLVE9.进入通用后处理器观察结果：–MainMenuGeneralPostproc–或用命令:/POST1November3,2003Inventory#001969W12-10INTRODUCTIONTOANSYS8.0-Part1INTRODUCTIONTOANSYS8.0INTRODUCTIONTOANSYS8.0INTRODUCTIONTOANSYS8.0---Part1Part1Part1WorkshopSupplement12.热分析带散热片的轴对称管9a.画温度:–MainMenuGeneralPostprocPlotResultsContourPlotNodalSolu•选取“DOFsolution”和“TemperatureTEMP”,然后按[OK]–或用命令:/POST1PLNSOL,TEMPNovember3,2003Inventory#001969W12-11INTRODUCTIONTOANSYS8.0-Part1INTRODUCTIONTOANSYS8.0INTRODUCTIONTOANSYS8.0INTRODUCTIONTOANSYS8.0---Part1Part1Part1WorkshopSupplement12.热分析带散热片的轴对称管9b.画热流量：–MainMenuGeneralPostprocPlotResultsContourPlotNodalSolu•选取“Flux&gradient”和“ThermalfluxTFSUM”,然后按[OK]–或用命令:PLNSOL,TF,SUMNovember3,2003Inventory#001969W12-12INTRODUCTIONTOANSYS8.0-Part1INTRODUCTIONTOANSYS8.0INTRODUCTIONTOANSYS8.0INTRODUCTIONTOANSYS8.0---Part1Part1Part1WorkshopSupplement12.热分析带散热片的轴对称管9c.画热梯度:–MainMenuGeneralPostprocPlotResultsContourPlotNodalSolu•选择“Flux&gradient”和“ThermalgradTGSUM”,然后[OK]–或使用命令:PLNSOL,TG,SUMNovember3,2003Inventory#001969W12-13INTRODUCTIONTOANSYS8.0-Part1INTRODUCTIONTOANSYS8.0INTRODUCTIONTOANSYS8.0INTRODUCTIONTOANSYS8.0---Part1Part1Part1WorkshopSupplement12.热分析带散热片的轴对称管10.保存并退出ANSYS:–在工具栏上选择“QUIT”按钮(或选择:UtilityMenuFileExit...)•选择“SaveEverything”•然后[OK]–或使用命令:FINISH/EXIT,ALL