ANSYS傳熱分析實(shí)例匯總文檔

(圓滿)ANSYS傳熱分析實(shí)例匯總,文檔(圓滿)ANSYS傳熱分析實(shí)例匯總,文檔(圓滿)ANSYS傳熱分析實(shí)例匯總,文檔實(shí)例1：某一潛水艇能夠簡(jiǎn)化為一圓筒，它由三層構(gòu)成，最外面一層為不銹鋼，中間為玻纖隔熱層，最里面為鋁層，筒內(nèi)為空氣，筒外為海水，求內(nèi)外壁面溫度及溫度分布。幾何參數(shù)：筒外徑30feet總壁厚2inch不銹鋼層壁厚0.75inch玻纖層壁厚1inch鋁層壁厚0.25inch筒長(zhǎng)200feet導(dǎo)熱系數(shù)不銹鋼BTU/hr.ft.oF玻纖BTU/hr.ft.oF鋁BTU/hr.ft.oF界限條件空氣溫度70oF海水溫度44.5oF空氣對(duì)流系數(shù)BTU/hr.ft2.oF海水對(duì)流系數(shù)80BTU/hr.ft2.oF沿垂直于圓筒軸線作橫截面，獲得一圓環(huán)，取此中1度進(jìn)行分析,如圖示。鋁玻璃纖維不銹鋼空氣海水R15feet以下分別列出log文件和菜單文件。/filename,Steady1/title,Steady-statethermalanalysisofsubmarine/units,BFTRo=15!外徑(ft)Rss=15-(0.75/12)

!不銹鋼層內(nèi)徑

ft)Rins=15-(1.75/12)

!玻璃纖維層內(nèi)徑

(ft)Ral=15-(2/12)

!鋁層內(nèi)徑

(ft)Tair=70

!潛水艇內(nèi)空氣溫度

!海水溫度

!不銹鋼的導(dǎo)熱系數(shù)

(BTU/hr.ft.oF)

!玻璃纖維的導(dǎo)熱系數(shù)

(BTU/hr.ft.oF)

!鋁的導(dǎo)熱系數(shù)

(BTU/hr.ft.oF)

!空氣的對(duì)流系數(shù)

(BTU/hr.ft2.oF)Hsea=80

!海水的對(duì)流系數(shù)

(BTU/hr.ft2.oF)/prep7et,1,plane55!定義二維熱單元mp,kxx,1,Kss!設(shè)定不銹鋼的導(dǎo)熱系數(shù)mp,kxx,2,Kins!設(shè)定玻璃纖維的導(dǎo)熱系數(shù)mp,kxx,3,Kal!設(shè)定鋁的導(dǎo)熱系數(shù)!創(chuàng)辦幾何模型aglue,allnumcmp,arealesize,1,,,16!設(shè)定區(qū)分網(wǎng)格密度lesize,4,,,4lesize,14,,,5lesize,16,,,2eshape,2!設(shè)定為照耀網(wǎng)格區(qū)分mat,1amesh,1mat,2amesh,2mat,3amesh,3/SOLUSFL,11,CONV,HAIR,,TAIR!施加空氣對(duì)流界限10.MainMenu:Preprocessor>-Attributes-Define>PickedArea,SFL,1,CONV,HSEA,,TSEA!施加海水對(duì)流界限SOLVE/POST1PLNSOL！輸出溫度彩色云圖finish菜單操作:1.UtilityMenu>File>changejobename,輸入Steady1；2.UtilityMenu>File>changetitle,輸入Steady-statethermalanalysisofsubmarine；3.在命令行輸入:/units,BFT；MainMenu:Preprocessor；MainMenu:Preprocessor>ElementType>Add/Edit/Delete,選擇PLANE55；6.MainMenu:Preprocessor>MaterialProp>-Constant-Isotropic,默認(rèn)資料編號(hào)為1,在KXX框中輸入8.27,選擇APPLY,輸入資料編號(hào)為2,在KXX框中輸入0.028,選擇APPLY,輸入資料編號(hào)為3,在KXX框中輸入；7.MainMenu:Preprocessor>-Modeling->Create>-Areas-Circle>ByDimensions,在RAD1中輸入15,在RAD2中輸入15-(.75/12),在THERA1中輸入-0.5,在THERA2中輸入0.5,選擇APPLY,在RAD1中輸入15-(.75/12),在RAD2中輸入15-(1.75/12),選擇APPLY,在RAD1中輸入15-(1.75/12),在RAD2中輸入15-2/12,選擇OK；8.MainMenu:Preprocessor>-Modeling->Operate>-Booleane->Glue>Area,選擇PICKALL；9.MainMenu:Preprocessor>-Meshing-SizeContrls>-Lines-PickedLines,選擇不銹鋼層短邊,在NDIV框中輸入4,選擇APPLY,選擇玻璃纖維層的短邊,在NDIV框中輸入5,選擇APPLY,選擇鋁層的短邊,在NDIV框中輸入2,選擇APPLY,選擇四個(gè)長(zhǎng)邊,在NDIV中輸入16；選擇不銹鋼層,在MAT框中輸入1,選擇APPLY,選擇玻璃纖維層,在MAT框中輸入2,選擇APPLY,選擇鋁層,在MAT框中輸入3,選擇OK；11.MainMenu:Preprocessor>-Meshing-Mesh>-Areas-Mapped>3or4sided,選擇PICKALL；MainMenu:Solution>-Loads-Apply>-Thermal-Convection>Onlines,選擇不銹鋼外壁,在VALI

框中輸入

80,在VAL2I框中輸入44.5,選擇APPLY,選擇鋁層內(nèi)壁,在VALI框中輸入2.5,在

VAL2I

框中輸入

70,選擇

OK；13.MainMenu:Solution>-Solve-CurrentLS

；14.MainMenu:GeneralPostproc>PlotResults>-ContourPlot-NodalSolu,

選擇

Temperature。對(duì)流換熱系數(shù)定義：流體與固體表面之間的換熱能力，比方說(shuō)，物體表面與周邊空氣溫差1℃，單位時(shí)間單位面積上經(jīng)過(guò)對(duì)流與周邊空氣互換的熱量。單位為W/(m^2·℃)。表面對(duì)流換熱系數(shù)的數(shù)值與換熱過(guò)程中流體的物理性質(zhì)、換熱表面的形狀、部位、表面與流體之間的溫差以及流體的流速等都有親密關(guān)系。物體表面周邊的流體的流速愈大，其表面對(duì)流換熱系數(shù)也愈大。如人處在風(fēng)速較大的環(huán)境中，因?yàn)槠つw表面的對(duì)流換熱系數(shù)較大，其散熱〔或吸熱〕量也較大。對(duì)流換熱系數(shù)可用經(jīng)驗(yàn)公式計(jì)算，平常用巴茲公式計(jì)算。的大概量級(jí)：空氣自然對(duì)流5～25，氣體強(qiáng)迫對(duì)流20～100。實(shí)例2:一鋼鑄件及其砂模的橫截面尺寸以以下列圖:砂模的熱物理性能以下表所示:單位制導(dǎo)熱系數(shù)(KXX)Btu/hr.in.oF密度(DENS)lbm/in3比熱(C)Btu/lbm.oF鑄鋼的熱物理性能以下表所示:單位制0oF2643oF2750oF2875oF導(dǎo)熱系數(shù)Btu/hr.in.oF焓Btu/in30初始條件:鑄鋼的溫度為2875oF，砂模的溫度為80oF；砂模外界限的對(duì)流界限條件：對(duì)流系數(shù)2.oF，空氣溫度80oF；求3個(gè)小時(shí)后鑄鋼及砂模的溫度散布。/Title,CastingSolidification進(jìn)入前辦理/prep7et,1,plane55！定義單元！定義砂模熱性能mptemp,1,0,2643,2750,2875！定義鑄鋼的熱性能mpplot,kxx,2mpplot,enth,2save！創(chuàng)辦幾何模型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！區(qū)分網(wǎng)格esize,1amesh,5mat,2aplotamesh,4eplot/pnum,elem/number,1save！進(jìn)入加載求解/SOLUantype,transesel,s,mat,,2

！設(shè)定為瞬態(tài)分析！設(shè)定鑄鋼的初始溫度nsle,s/replotic,all,temp,2875esel,inve

！設(shè)定砂模的初始溫度nsle,s/replotic,all,temp,80allselsavelplotsfl,1,CONV,0.014,,80

！設(shè)定砂模外界限對(duì)流sfl,3,CONV,0.014,,80sfl,4,CONV,0.014,,80/psf,conv,2time,3kbc,1autots,ontimint,ontintp,,,,1

！設(shè)定瞬態(tài)分析時(shí)間！設(shè)定為階越的載荷！打開自動(dòng)時(shí)間步長(zhǎng)！設(shè)準(zhǔn)時(shí)間步長(zhǎng)！打開時(shí)間積分！將THETA設(shè)定為1outres,all,all

！輸入每個(gè)子步的結(jié)果solve！進(jìn)入后辦理/post26/pnum,node,1/number,0eplotnsol,2,204,temp,centerplvar,2

！設(shè)定鑄鋼中心點(diǎn)溫度隨時(shí)間的變量！繪制溫度～時(shí)間曲線savefinish菜單操作:1.UtilityMenu>File>ChangeTitle,輸入CastingSolidification;定義單元種類:MainMenu>Preprocessor>ElementType>Add/Edit/Delete,Add,Quad4node55；定義砂模熱性能:MainMenu>Preprocessor>MaterialProps>Isotropic,默認(rèn)資料編號(hào)1,在Density(DENS)框中輸入0.054,在Thermalconductivity(KXX)框中輸入0.025,在Specificheat(C)框中輸入0.28;定義鑄鋼熱性能溫度表:MainMenu>Preprocessor>MaterialProps>-TempDependent->TempTable,輸入T1=0,T2=2643,T3=2750,T4=2875;定義鑄鋼熱性能:MainMenu>Preprocessor>MaterialProps>-TempDependent->PropTable,選擇ThConductivity,選擇KXX,輸入資料編號(hào)2,輸入C1=1.44,C2=1.54,C3=1.22,C4=1.22,選擇Apply,選擇Enthalpy,輸入C1=0,C2=128.1,C3=163.8,C4=174.2;創(chuàng)辦重點(diǎn)點(diǎn):MainMenu>Preprocessor>-Modeling->Create>Keypoints>InActiveCS,輸入重點(diǎn)點(diǎn)編號(hào)1,輸入座標(biāo)0,0,0,輸入重點(diǎn)點(diǎn)編號(hào)2,輸入座標(biāo)22,0,0,輸入重點(diǎn)點(diǎn)編號(hào)3,輸入坐標(biāo)10,12,0,輸入重點(diǎn)點(diǎn)編號(hào)4,輸入座標(biāo)0,12,0;7.創(chuàng)立幾何模型:MainMenu>Preprocessor>-Modeling->Create>-Areas->Arbitrary>ThroughKPs,次序采納重點(diǎn)點(diǎn)1,2,3,4;8.MainMenu>Preprocessor>-Modeling->Create>-Areas->Rectangle>ByDimension,輸入X1=4,X2=22,Y1=4,Y2=8;9.進(jìn)行布爾操作:MainMenu>Preprocessor>-Modeling->Operate>-Booleans->Overlap>Area,Pickall；刪除節(jié)余面:MainMenu>Preprocessor>-Modeling->Delete>AreaandBelow,3保留數(shù)據(jù)庫(kù):在AnsysToolbar中采納SAVE_DB;12.定義單元大小:MainMenu>Preprocessor>-Meshing->SizeCntrls>-Global->Size,在Elementedgelength框中輸入1;對(duì)砂模區(qū)分網(wǎng)格:MainMenu>Preprocessor>-Meshing->Mesh>-Areas->Free,選擇砂模;14.對(duì)鑄鋼區(qū)分網(wǎng)格:MainMenu>Preprocessor>-Attributes->Define>DefaultAttribs,在Materialnumber菜單中選擇2;MainMenu>Preprocessor>-Meshing->Mesh>-Areas->Free,選擇鑄鋼;16.定義分析種類:MainMenu>Solution>-AnalysisType->NewAnalysis,選擇Transient;17.選擇鑄鋼上的節(jié)點(diǎn):UtilityMenu>Select>Entities,選擇element,mat,輸入2,選擇Apply,選擇node,attachedtoelement,選擇OK;定義鑄鋼的初始溫度:MainMenu>Solution>-Loads->Apply>InitialCondit’n>Define,選擇選擇砂模上的節(jié)點(diǎn):UtilityMenu>Select>Entities,Nodes,inverse定義砂模的初始溫度:MainMenu>Solution>-Loads->Apply>InitialCondit’n>Define,選擇Pickall,選擇temp,輸入80,OK;UtilityMenu>Select>Everything；UtilityMenu>Plot>Lines；定義對(duì)流界限條件:MainMenu>Solution>-Loads->Apply>-Thermal->Converction>OnLines,選擇砂模的三個(gè)界限1,3,4,在filecoefficent框中輸入80,在Bulktemperature框中輸入,80;設(shè)定瞬態(tài)分析時(shí)間選項(xiàng):TimeStepsizeSteppedorrampedb.c.SteppedAutomatictimesteppingon設(shè)置輸出:MainMenu