ANSYS熱分析的經(jīng)典實(shí)例（圓筒罐熱分析）

2017-03-03  by:CAE仿真在線  來源:互聯(lián)網(wǎng)

一圓筒形的罐有一接管,罐外徑為3英尺,壁厚為0.2英尺,接管外徑為0.5英尺,壁厚為0.1英尺,罐與接管的軸線垂直且接管遠(yuǎn)離罐的端部。如圖所示:

罐內(nèi)流體溫度為華氏450度,與罐壁的對(duì)流換熱系數(shù)年為250BUT/hr-ft2-oF,接管內(nèi)流體的溫度為華氏100度,與管壁的對(duì)流換熱系數(shù)隨管壁溫度而變。接管與罐為同一種材料,它的熱物理性能如下表所示:

溫度	70	200	300	400	500	oF
密度	0.285	0.285	0.285	0.285	0.285	lbm/in3
導(dǎo)熱系數(shù)	8.35	8.90	9.35	9.8	10.23	Btu/hr-ft-oF
比熱	0.113	0.117	0.119	0.122	0.125	Btu/lbm-oF
對(duì)流系數(shù)*	426	405	352	275	221	Btu/hr-ft2-oF

*接管內(nèi)壁對(duì)流系數(shù)

求罐與接管的溫度分布。

以下分別列出LOG文件及菜單操作

/prep7

/title,Steady-state thermal analysis of pipe junction

/units,bin !使用英制單位

et,1,90 !定義熱單元

mp,dens,1,.285 !密度

mptemp,,70,200,300,400,500 !建立溫度表

mpdata,kxx,1,,8.35/12,8.90/12,9.35/12,9.80/12,10.23/12 !導(dǎo)熱系數(shù)

mpdata,c,1,,0.133,0.177,0.119,0.122,0.125 !比熱

mpdata,hf,2,,426/144,405/144,352/144,275/144,221/144 !接管對(duì)流系數(shù)

!定義幾何模型參數(shù)

ri1=1.3 !罐內(nèi)半徑

ro1=1.5 !罐外半徑

z1=2 !罐長(zhǎng)

ri2=0.4 !接管內(nèi)半徑

ro2=0.5 !接管外半徑

z2=2 !接管長(zhǎng)

!建立幾何模型

cylind,ri1,ro1,,z1,,90 !1/4罐體

wprota,0,-90 !將工作平面旋轉(zhuǎn)到垂直于接管軸線

cylind,ri2,ro2,,z2,-90 !1/4接管

wpstyl,defa !將工作平面恢復(fù)到默認(rèn)狀態(tài)

vovlap,1,2 !進(jìn)行OVERLAP布爾操作

/pnum,volu,1 !打開實(shí)體編號(hào)

/view,,-3,-1,1 !定義顯示角度

/type,,4

/title, Volumes used in building pipe/tank junction

vplot !顯示實(shí)體

vdele,3,4,,1 !刪除多余實(shí)體

!劃分網(wǎng)格

asel,,loc,z,z1 !選擇罐上Z=Z1的面

asel,a,loc,y,0 !添加選擇罐上Y=0的面

cm,aremote,area !創(chuàng)建名為AREMOTE的面組

/pnum,area,1

/pnum,line,1

/title,lines showing the portion being modeled

aplot

/noerase

lplot

/erase

accat,all !組合罐遠(yuǎn)端的面及線,為映射劃分網(wǎng)

!格作準(zhǔn)備

lccat,12,7

lccat,10,5

lesize,20,,,4 !在接管壁厚方向分4等分

lesize,40,,,6 !在接管長(zhǎng)度方向分6等分

lesize,6,,,4 !在罐壁厚方向分4等分

allsel !選擇EVERYTHING

esize,0.4 !設(shè)定默認(rèn)的單元大小

mshape,0,3d !選擇3D映射網(wǎng)格

mshkey,1

save !保存數(shù)據(jù)文件

vmesh,all !劃分網(wǎng)格,產(chǎn)生節(jié)點(diǎn)與單元

/pnum,defa

/title, elements in portion being modeled

eplot !顯示單元

finish

!加載求解

/solu

antype,static !定義為穩(wěn)態(tài)分析

nropt,auto !設(shè)置求解選項(xiàng)為Program-chosen

!Newton-Raphson

tunif,450 !設(shè)定初始所有節(jié)點(diǎn)溫度

csys,1 !變?yōu)橹鴺?biāo)

nsel,s,loc,x,ri1 !選擇罐內(nèi)表面的節(jié)點(diǎn)

sf,all,conv,250/144,450 !定義對(duì)流邊界條件

cmsel,,aremote !選擇AREMOTE面組

nsla,,1 !選擇屬于AREMOTE面組的節(jié)點(diǎn)

d,all,temp,450 !定義節(jié)點(diǎn)溫度

wprota,0,-90 !將工作平面旋轉(zhuǎn)到垂直于接管軸線

cswpla,11,1 !創(chuàng)建局部柱坐標(biāo)

nsel,s,loc,x,ri2 !選擇接管內(nèi)壁的節(jié)點(diǎn)

sf,all,conv,-2,100 !定義對(duì)流邊界條件

allsel !選擇EVERYTHING

/pbc,temp,,1 !顯示所有溫度約束

/psf,conv,,2 !顯示所有對(duì)流邊界

/title,Boundary conditions

nplot !顯示節(jié)點(diǎn)

wpstyle,defa !工作平面恢復(fù)默認(rèn)狀態(tài)

csys,0 !變?yōu)橹苯亲鴺?biāo)

autots,on !打開自動(dòng)步廠長(zhǎng)

nsubst,50 !設(shè)定子步數(shù)量

kbc,0 !設(shè)定為階越

outpr,nsol,last !設(shè)置輸出

solve !進(jìn)行求解

finish

!進(jìn)入后處理

/post1

/title,Temperature contrours at pipe/tank junction

plnsol,temp !顯示溫度彩色云圖

finish

/exit,all

菜單操作

1、 設(shè)定標(biāo)題:Utility Menu>File>Change Title,輸入Steady-State analysis of pipe junction,選擇OK;

2、 設(shè)定單位制:在命令提示行輸入/UNITS,BIN;

3、 定義單元類型:Main Menu>Preprocesor>Element Type>Add/Edit/Delete,選擇Thermal Solid, Bricck 20 node 90號(hào)單元;

4、 定義材料屬性

(1) Main Menu>Preprocessor>Material Props>-Constant->Isotropic,默認(rèn)材料編號(hào)1,在DENSITY框中輸入0.285;

(2) Main Menu>Preprocessor>Material Props>-Temp Dependent->Temp Table,輸入溫度70,200,300,400,500;

(3) Main Menu>Preprocessor>Material Props>-Temp Dependent->Prop Table,選擇導(dǎo)熱系數(shù)KXX,材料編號(hào)為1,輸入與溫度表對(duì)應(yīng)的導(dǎo)熱系數(shù)8.35/12,8.9/12,9.35/12,9.8/12,10.23/12,選擇APPLY;

(4) 選擇比熱C,材料編號(hào)為1,輸入0.113,0.117,0.119,0.122,0.125,選擇APPLY;

(5) 選擇對(duì)流系數(shù)HF,材料編號(hào)為2,輸入426/144,405/144,352/144,275/144, 221/144,選擇OK。

5、 定義幾何模型參數(shù):Utility Menu>Parameters>Scalar Parameters,輸入ri1=1.3,ro1=1.5,z1=2,ri2=0.4,ro2=0.5,z2=2;

6、 建立幾何模型

(1) Main Menu>Preprocessor>-Modeling->Create>-Volumes->Cylinder>By

Dimensions, Outer radius框中輸入ro1,Optional inner radium框中輸入ri1,Z coordinates框中輸入0和Z1,Ending angle框中輸入90;

(2) Utility Menu>WorkPlane>Offset WP by Increments,在XY,YZ,ZX框中輸入0,-90;

(3) Main Menu>Preprocessor>-Modeling->Create>-Volumes->Cylinder>By

Dimensions; Outer radius框中輸入ro2, Optional inner radium框中輸入ri2, Z coordinates框中輸入0和Z2,Starting angle框中輸入-90,Ending angle框中輸入0;

(4) Utility Menu>WorkPlane>Align WP with>Global Cartesian;

7、 進(jìn)行布爾操作:Main Menu>Preprocessor>-Modeling->Operate>-Booleans->

Overlap >Volumes,選擇Pick All;

8、 觀察幾何模型

(1) Utility Menu>PlotCtrls>Numbering,打開volumes;

(2) Utility Menu>PlotCtrls>View Direction, 在Coords of view point框中輸入-3,-1,1;

9、 刪除多余實(shí)體Main Menu>Preprocessor>-Modeling->Delete>Volume and Below,在命令輸入行輸入3,4回車;

10、 創(chuàng)建組AREMOTE

(1) Utility Menu>Select>Entities,選擇Area, By location, Z Coordinates, 在Min, Max框中輸入Z1,選擇APPLY,Y Coordinates, 在Min, Max框中輸入0,OK;

(2) Utility Menu>Select>Comp/Assembly>Create Component,在Component name框中輸入AREMOTE, 在Components is made of菜單中選擇AREA;

11、 組合面及線

(1) Main Menu>Preprocessor>-Meshing->Mesh>-Volumes->Mapped>

-Concatenate->Area,選擇Pick all;

(2) Main Menu>Preprocessor>-Meshing->Mesh>-Volumes->Mapped>

-Concatenate->Lines,在命令行中輸入12,7回車,選擇APPLY,在命令行中輸入10,5回車,OK;

12、 設(shè)定網(wǎng)格密度

(1) Main Menu>Preprocessor>-Meshing->Size Cntrls>Picked Lines,選擇線6和20,OK,在No. of element divisions框中輸入4,OK;

(2) Main Menu>Preprocessor>-Meshing->Size Cntrls>Picked Lines,選擇線40,OK,在No. of element divisions框中輸入6,OK;

(3) Utility Menu>Select>Everything;

(4) Main Menu>Preprocessor>-Meshing->Size Cntrls>-Global->Size,在element edge length框中輸入0.4,OK;

13、 劃分網(wǎng)格:Main Menu>Preprocessor>-Meshing->Mesh>-Volumes->Mapped>4 to 6 sides,選擇Pick All;

14、 定義求解類型及選項(xiàng)

(1) Main Menu>Solution>-Analysis Type->New Analysis,選擇Steady-State;

(2) Main Menu>Solution>-Analysis Options,選擇Program-chosen;

15、 施加對(duì)流載荷

(1) Utility Menu>WorkPlane>Change Active CS to>Global Cylindrical;

(2) Utility Menu>Select>Entities,選擇Nodes, By location, X,在Min, Max框中輸入ri1,OK;

(3) Main Menu>Solution>-Loads->Apply>-Thermal->Convection>On Nodes,選擇Pick All, 輸入250/144及450,OK;

16、 在AREMOTE組上施加溫度約束

(1) Utility Menu>Select>Comp/Assembly>Select Comp/Assembly,選aremote;

(2) Utility Menu>Select>Entities,選擇Nodes, Attached to, On the Area all, OK;

(3) Main Menu>Solution>-Loads->Apply>-Thermal->Temperature>On Nodes,選擇Pick all,輸入45,OK;

17、 施加與溫度有關(guān)的對(duì)流邊界條件

(1) Utility Menu>WorkPlane>Offset WP by Increments,在XY,YZ,ZX Angles框中輸入0,-90,OK;

(2) Utility Menu>WorkPlane>Local Coordinate Systems>Create Local CS>At WP Origin,在Type of coordinate system菜單中,選擇Cylindrical 1,OK;

(3) Utility Menu>Select Entities,選擇Nodes, By location, X, 在Min, Max框中輸入ri2,OK;

(4) Main Menu>Solution>-Loads->Apply>-Thermal->Convection>On Nodes,選擇Pick All,在Film coefficient框中輸入-2,在Bulk temperature框中輸入100,OK;

(5) Utility Menu>Select>Everything;

(6) Utility Menu>PlotCtrls>Symbols,在Show pres and convect as菜單中選擇Arrow, OK;

(7) Utility Menu>Plot>Nodes;

18、 恢復(fù)工作平面及坐標(biāo)系統(tǒng)

(1) Utility Menu>WorkPlane>Change Active CS to>Global Cartesian;

(2) Utility Menu>WorkPlane>Align WP with>Global Cartesian;

19、 設(shè)定載荷步選項(xiàng):

Main Menu>Solution>-Load Step Options->Time/Frequenc>Time and Substeps,在Number of substeps框中輸入50,設(shè)置Automatic time stepping為On;

20、 求解:Main Menu>Solution>-Solve->Current LS

21、 顯示溫度分布彩色云圖: Main Menu>General Postproc>Plot Results>-Contour Plot->Nodal Solu,選擇Temperature TEMP。

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