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Workshop 12

Thermal Analysis

x symme r c pe

with Fins

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12. Thermal Analysis

Axisymmetric Pipe with Fins INTR

INTR

INTR

INTR

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Description

DUCTI

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and thermal flux distributions under given loadingconditions (see next page).

NTO

NTO

NTO

NTO

NTO

NTO

The model is axisymmetric. Also, only half the fin is

modeled, so the bottom of the model is a symmetry

boundary.NSYS

NSYS

NSYS---

NSYS

NSYS

NSYS---

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12. Thermal Analysis

Axisymmetric Pipe with Fins INTR

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Loads

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External Convection = 0.69e-4

Internal Convection 0.28e-3

Tbulk = 450F

NT

O

NT

O

NT

O

NT

O

NT

O

NT

O

Tbulk = 70F

NSYS

NSYS

NSYS---

NSYS

NSYS

NSYS---

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Line of Symmetry

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12. Thermal Analysis

Axisymmetric Pipe with Fins INTR

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1. Enter ANSYS in the working directory specified by your instructor using pipe-th as

the jobname.

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. e e re erences o erma :

Main Menu > Preferences Select Thermal, then [OK]

3. Read input from pipe-th.inp to create the 2-D axisymmetric model and specify mesh

NT

O

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O

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O

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O

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O

divisions on lines:

Utility Menu > File > Read Input from

Select pipe-th.inp, then [OK]

Or issue:NSYS

NSYS

NSYS---

NSYS

NSYS

NSYS---

/INPUT,pipe-th,inp

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12. Thermal Analysis

Axisymmetric Pipe with Fins INTR

INTR

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4. Specify the element type to be PLANE55 and set keyopt(3)=axisymmetric:

Main Menu > Preprocessor > Element Type > Add/Edit/Delete

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...

Pick Thermal Solid and Quad 4node 55, then [OK]

[Options ...]

Set K3 = Axisymmetric, then [OK]

CloseNT

O

NT

O

NT

O

NT

O

NT

O

NT

O

Or issue:

ET,1,PLANE55, , , 1

NSYS

NSYS

NSYS---

NSYS

NSYS

NSYS---

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12. Thermal Analysis

Axisymmetric Pipe with Fins INTR

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5. Read in material properties from the material library for 304 Stainless Steel:

Main Menu > Preprocessor > Material Props > Material Library > Import Library

Select BIN then OK

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Ask your instructor for the path to matlib directory

Default path is:

C:\Program Files\Ansys Inc\V100\ANSYS\matlib

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O

Select Stl_AISI-304.BIN_MPL, then [OK]

Review the ansuitmp window

Close the ansuitmp window

NSYS

NSYS

NSYS---

NSYS

NSYS

NSYS---

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12. Thermal Analysis

Axisymmetric Pipe with Fins INTR

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6. Mesh the model using mapped meshing with 2-D quad elements:

Main Menu > Preprocessor > Meshing > MeshTool

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SIZE = 0.25/2, then [OK]

Select Mapped, then [Mesh]

[Pick All]

CloseNT

O

NT

O

NT

O

NT

O

NT

O

NT

O

Or issue:

MSHAPE,0,2D

MSHKEY,1ESIZE,0.25/2 N

SYS

NSYS

NSYS---

NSYS

NSYS

NSYS---

AMESH,ALL

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12. Thermal Analysis

Axisymmetric Pipe with Fins INTR

INTR

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7. Apply convection loads to the solid model lines:

Utility Menu > Plot > Lines

> > > > > >

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Pick the outer four lines (10, 2, 7, and 6), then [OK]

Set VALI = 0.69e-4 and VAL2I = 70, then [OK]

Main Menu > Solution > Define Loads > Apply > Thermal > Convection > On Lines

Pick the inner two lines 9 and 13 then OKNT

O

NT

O

NT

O

NT

O

NT

O

NT

O

Set VALI = 0.28e-3 and VAL2I = 450, then [OK]

Or issue:

LPLO

/SOLU NSYS

NSYS

NSYS---

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SFL,2,CONV,0.69e-4, ,70

SFL,6,CONV,0.69e-4, ,70

SFL,7,CONV,0.69e-4, ,70

SFL,10,CONV,0.69e-4, ,70

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SFL,9,CONV,0.28e-3, ,450

SFL,13,CONV,0.28e-3, ,450

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12. Thermal Analysis

Axisymmetric Pipe with Fins INTR

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8. Save the database and obtain the solution:

Pick the SAVE_DB button in the Toolbar (or select: Utility Menu > File > Save as Jobname.db)

> > >

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Review the /STATUS Command window and then close it

[OK]

Or issue:

SAVENT

O

NT

O

NT

O

NT

O

NT

O

NT

O

/SOLU

SOLVE

9. Enter the general postprocessor and review the results:NSYS

NSYS

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a n enu enera os proc

Or issue:

/POST1

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12. Thermal Analysis

Axisymmetric Pipe with Fins INTR

INTR

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9a. Plot temperatures:

Main Menu > General Postproc > Plot Results > Contour Plot > Nodal Solu

> >

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,

Or issue:

/POST1

PLNSOL,TEMP

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O

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O

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O

NT

O

NT

ONSYS

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NSYS---

NSYS

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12. Thermal Analysis

Axisymmetric Pipe with Fins INTR

INTR

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9b. Plot thermal flux:

Main Menu > General Postproc > Plot Results > Contour Plot > Nodal Solu

> >

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,

Or issue:

PLNSOL,TF,SUM

NT

O

NT

O

NT

O

NT

O

NT

O

NT

ONSYS

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NSYS---

NSYS

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12. Thermal Analysis

Axisymmetric Pipe with Fins INTR

INTR

INTR

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9c. Plot thermal gradient:

Main Menu > General Postproc > Plot Results > Contour Plot > Nodal Solu

> >

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,

Or issue:

PLNSOL,TG,SUM

NT

O

NT

O

NT

O

NT

O

NT

O

NT

ONSYS

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NSYS

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12. Thermal Analysis

Axisymmetric Pipe with Fins INTR

INTR

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10. Save and exit ANSYS:

Pick the QUIT button from the Toolbar (or select: Utility Menu > File > Exit...)

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[OK]

Or issue:

FINISH

/EXIT ALLNT

O

NT

O

NT

O

NT

O

NT

O

NT

ONSYS

NSYS

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NSYS

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