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1、·实例1: 某一潜水艇可以简化为一圆筒,它由三层组成,最外面一层为不锈钢,中间为玻纤隔热层,最里面为铝层,筒为空气,筒外为海水,求外壁面温度及温度分布。几何参数:筒外径30feet总壁厚2inch不锈钢层壁厚0.75inch玻纤层壁厚1inch铝层壁厚0.25inch筒长200feet导热系数不锈钢8.27BTU/hr.ft.oF玻纤0.028BTU/hr.ft.oF铝117.4BTU/hr.ft.oF边界条件空气温度70oF海水温度44.5oF空气对流系数2.5BTU/hr.ft2.oF海水对流系数80BTU/hr.ft2.oF 沿垂直于
2、圆筒轴线作横截面,得到一圆环,取其中1度进行分析,如图示。以下分别列出log文件和菜单文件。/filename,Steady1/title,Steady-statethermalanalysisofsubmarine/units,BFTRo=15!外径(ft)Rss=15-(0.75/12)!不锈钢层径ft)Word资料·Rins=15-(1.75/12)!玻璃纤维层径(ft)Ral=15-(2/12)!铝层径(ft)Tair=70!潜水艇空气温度Tsea=44.5!海水温度Kss=8.27!不锈钢的导热系数(BTU/hr.ft.oF)Kins
3、=0.028!玻璃纤维的导热系数(BTU/hr.ft.oF)Kal=117.4!铝的导热系数(BTU/hr.ft.oF)Hair=2.5!空气的对流系数(BTU/hr.ft2.oF)Hsea=80!海水的对流系数(BTU/hr.ft2.oF)/prep7et,1,plane55!定义二维热单元mp,kxx,1,Kss!设定不锈钢的导热系数mp,kxx,2,Kins!设定玻璃纤维的导热系数mp,kxx,3,Kal!设定铝的导热系数pcirc,Ro,Rss,-0.5,0.5!创建几何模型pcirc,Rss,Rins,-0.5,0.5pcirc,Ri
4、ns,Ral,-0.5,0.5aglue,allnumcmp,arealesize,1,,,16!设定划分网格密度lesize,4,,,4lesize,14,,,5lesize,16,,,2eshape,2!设定为映射网格划分mat,1amesh,1mat,2amesh,2mat,3amesh,3/SOLUSFL,11,CONV,HAIR,,TAIR!施加空气对流边界SFL,1,CONV,HSEA,,TSEA!施加海水对流边界Word资料·SOLVE/POST1PLNSOL!输出温度彩色云图finish菜单操作:1.UtilityMenu>Fi
5、le>changejobename,输入Steady1;2.UtilityMenu>File>changetitle,输入Steady-statethermalanalysisofsubmarine;3.在命令行输入:/units,BFT;4.MainMenu:Preprocessor;5.MainMenu:Preprocessor>ElementType>Add/Edit/Delete,选择PLANE55;6.MainMenu:Preprocessor>MaterialProp>-Constant-Isotropic,默认材料编号为1,在KX
6、X框中输入8.27,选择APPLY,输入材料编号为2,在KXX框中输入0.028,选择APPLY,输入材料编号为3,在KXX框中输入117.4;7.MainMenu:Preprocessor>-Modeling->Create>-Areas-Circle>ByDimensions,在RAD1中输入15,在RAD2中输入15-(.75/12),在THERA1中输入-0.5,在THERA2中输入0.5,选择APPLY,在RAD1中输入15-(.75/12),在RAD2中输入15-(1.75/12),选择APPLY,在RAD1中输入15-(1.75/
7、12),在RAD2中输入15-2/12,选择OK;8.MainMenu:Preprocessor>-Modeling->Operate>-Booleane->Glue>Area,选择PICKALL;9.MainMenu:Preprocessor>-Meshing-SizeContrls>-Lines-PickedLines,选择不锈钢层短边,在NDIV框中输入4,选择APPLY,选择玻璃纤维层的短边,在NDIV框中输入5,选择APPLY,选择铝层的短边,在NDIV框中输入2,选择APPLY,选择四个长边,在NDIV中输入16;10.MainMe
8、nu:Preprocessor>-Attributes-Define>PickedArea,选择不锈钢层,在MAT框中输入1,选择APPLY,选择玻璃