Tut Heating Coil

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Master Contents Master Index Help On Help

CFX-5 Tutorials

Tutorial 14

Conjugate Heat Transferin a Heating Coil

Sample files used in this tutorial can be copied to your working

directory from /examples. SeeWorking Directory (p. 2)

and Sample Files (p. 3) for more information.

Sample files referenced by this tutorial include:

HeatingCoil.pre

HeatingCoil_001.res

HeatingCoil_solid92.cdb

HeatingCoilAnimation.avi HeatingCoilANSYSResults.rst

HeatingCoilMesh.gtm
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Conjugate Heat Transfer in a Heating CoilIntroduction

Page 310 CFX-5 Tutorials


14.A: Introduction

14.A.1: Features explored in this tutorial

Introduction:This tutorial addresses the following features of CFX-5.

You learn about: creating and using a solid domain as a heater coil in CFX-Pre

modelling Conjugate Heat Transfer in CFX-Pre

specifying a subdomain to specify a heat source

creating a cylinder locator using CEL in CFX-Post

examining the temperature distribution which is affected by heat

transfer from the coil to the fluid

Component Feature Details

CFX-Pre User Mode General Mode

Simulation Type Steady State

Fluid Type General Fluid

Domain Type Multiple Domain

Turbulence Model k-Epsilon

Heat Transfer Thermal Energy

Conjugate Heat Transfer

Subdomains Energy Source

Boundary Conditions Inlet (Subsonic)

Opening

Wall: No-Slip

Wall: Adiabatic

CEL (CFX Expression Language)

Timestep Physical Timescale

CFX-Solver Manager n/a n/a

CFX-Post Plots Cylinder

Default LocatorsIsosurface

Other Changing the Colour

Range

Data Export

Expression Editor

Lighting Adjustment

Variable Editor
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Conjugate Heat Transfer in a Heating CoilIntroduction

CFX-5 Tutorials Page 311


14.A.2: Before beginning this tutorial

Introduction: It is necessary that you have a working directory and that

sample files have been copied to that directory. This procedure is detailed

in "Introduction to the CFX-5 Tutorials" on page 1.

Unless you review the introductory materials and perform required steps

including setting up a working directory and copying related sample files,the rest of this tutorial may not work correctly. It is recommended that you

perform the tasks inTutorial 1,Tutorial 2 andTutorial 3 before working with

other tutorials as these three tutorials detail specific procedures that are

simplified in subsequent tutorials.

14.A.3: Overview of the problem to solve

This example demonstrates the capability of CFX-5 in modelling conjugate

heat transfer. In this example, part of the model of a simple heat exchanger

is used to model the transfer of heat from a solid to a fluid. The model

consists of a fluid domain and a solid domain. The fluid domain is an annular

region through which water flows at a constant rate. The heater is a solid

copper coil modelled as a constant heat source.

This tutorial also includes an optional step that demonstrates the use of the

CFX to ANSYS Data Transfer Tool to export thermal and mechanical stress

data for analysis in ANSYS. A results file is provided in case you wish to skip

the model creation and solution steps within CFX-5. If you wish to do this,

copy the results file from the examples directory to your working directory

and continue from Exporting the Results to ANSYS (p. 322).

Inflow

Outflow

Solid Heater
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Conjugate Heat Transfer in a Heating CoilDefining the Simulation in CFX-Pre



14.B: Defining the Simulation in CFX-Pre

This section describes the step-by-step definition of the flow physics in

CFX-Pre. If you wish, you can use the session file HeatingCoil.pre to

complete this section for you and continue from Obtaining a Solution

(p. 318). See one of the first four tutorials for instructions on how to do this.

14.B.1: Creating a New Simulation

1. Start CFX-Pre andcreatea newsimulationnamedHeatingCoilusing

the General Mode.

14.B.2: Importing the Mesh

Tip: While we provide a mesh to use with this tutorial, you may want to

develop your own in the future. Instructions on how to create this meshin CFX-Mesh are available from the CFX Community Site. Please see

"Mesh Generation" on page 3 for details.

1. Copy the mesh fileHeatingCoilMesh.gtm, located in the examples

directory (/examples), to your working directory.

2. Click the Mesh tab.

3. Right-click in the Mesh Selector and select Import.

4. Leave Mesh Format set to CFX-5 GTM file.5. Set File to HeatingCoilMesh.gtm.

6. Click OK to import the mesh.

7. Click Isometric View (Z up) .

14.B.3: Creating the Domains

This simulation requires both a fluidand a solid domain. First, you will create

a fluid domain for the annular region of the heat exchanger.The fluid domain will include the region of fluid flow but exclude the solid

copper heater.
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To create thefluid domain

1. Create a domain namedFluidZone.

2. On the General Options panel:

a. Click to expand the list of available regions and set Location to

B1.P3.

b. Set Domain Type to Fluid Domain.

c. Set Fluids List to Water.d. Set Coord Frame to Coord 0.

e. Set Reference Pressure to 0 [atm].

f. Under Buoyancy, set Option to Non Buoyant.

g. Under Domain Motion, set Option to Stationary.

3. Click the Fluid Models tab, then:

a. Under Heat Transfer Model, set Option to Thermal Energy.

b. Under Turbulence Model, set Option to k-Epsilon.c. Under Turbulent Wall Functions, set Option to Scalable.

d. Under Reaction or Combustion Model and Thermal Radiation

Model, leave Option set to None.

4. Click the Initialisation tab, then:

a. Turn on Domain Initialisation.

b. Turn on Initial Conditions.

The Automatic option is suitable for all variables. See "Automatic"

on page 87 in the document "CFX-5 Solver Modelling"for details ofthe automatic initial guess.

c. Turn on Turbulence Eddy Dissipation and set Option to

Automatic.

5. Click OK to create the domain.

14.B.4: Solid Domain

To create the

solid domain

1. Create a domain namedSolidZone.

2. On the General Options panel:

a. Click to expand the list of available regions and set Location to

B2.P3.

b. Set Domain Type to Solid Domain.

c. Set Solids List to Copper.
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3. Click the Solid Models tab, then:

a. Under Heat Transfer, set Option to Thermal Energy.

b. Under Thermal Radiation Model, set Option to None.

Since you know that the copper heating element will be much hotter than

the fluid, you can initialise the temperature to a reasonable value. The

initialisation option that is set when creating a domain applies only to thatdomain.

4. Click the Initialisation tab, then:

a. Under Temperature, set Option to Automatic with Value and

Temperature to 550 [K].

5. Click OK to create the domain.

14.B.5: Creating the Subdomain

To allow a thermal energy source to be specified for the copper heating

element, you need to create a Subdomain.

1. Click the Subdomain icon.

2. Create a Subdomain namedheater in domain SolidZone.

3. On the Basic Settings panel, set Location to B2.P3.

This is the same location as for the domainSolidZone, because we want

the source term to apply to the entire solid domain.

4. Click the Sources tab, then:a. Turn on Sources and Energy.

b. Set Source to 1.0E+07 [W m^-3].

5. Click OK to create the Subdomain.

14.B.6: Creating the Boundary Conditions

To create theinlet boundary

condition

You will now create an inlet boundary condition for the cooling fluid

(Water).1. Create a boundary condition namedinflow in domain FluidZone.

2. On the Basic Settings panel, set:

a. Boundary Type to Inlet

b. Location to inflow


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3. Click the Boundary Details tab, then:

a. Under Mass and Momentum, set Option to Normal Speed and

Normal Speed to 0.4 [m s^-1].

b. Under Turbulence, set Option to Medium (Intensity = 5%).

c. Under HeatTransfer,set Option to StaticTemperatureand Static

Temperature to 300 [K].4. Click OK to create the boundary condition.

To create theopeningboundarycondition

1. Create a boundary condition namedoutflow in domain FluidZone.

2. On the Basic Settings panel, set:

a. Boundary Type to Opening

b. Location to outflow

The opening boundary condition type is used in this case because we

expect, at some stage during the solution, that the coiled heating elementwill cause some recirculation at the exit. At an opening boundary you need

to setthe temperature of fluidthatenters through the boundary. In this case

it is useful to base this temperature on the fluid temperature at the outlet,

since we expect the fluid to be flowing mostly out through this opening.

3. Select Create > Library Objects > Expression Editor.

4. Create a new expression named OutletTemperature.

5. Set Definition to:

areaAve(T)@outflowYou can right-click in the Definition window to access the function

(Functions > Integrated Quantities > areaAve) and variable

(Variables > T). The locator outflow will not be available until you have

created the boundary condition, so you will have to type this part of the

expression.

6. Click Apply.

7. Click the Physics tab (click the button to scroll the tabs, if necessary).

The boundary condition editor for the opening will reappear in its laststate.


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8. Click the Boundary Details tab, then:

a. Under Mass and Momentum, set Option to Pressure and

Direction (stable) and Relative Pressure to 0 [Pa].

b. Under Flow Direction, set Option to Normal to Boundary

Condition.

c. Under Turbulence, set Option to Medium (Intensity = 5%).d. Under HeatTransfer,set Option to StaticTemperatureand Static

Temperature to OutletTemperature (for this expression, click

the field, then the icon beside the field before typing).

9. Click OK to create the boundary condition.

The default adiabatic wall boundary condition will automatically be applied

to the remaining unspecified external boundaries of the fluid domain.

The default Fluid-Solid Interface boundary condition (flux conserved) will

be applied to the surfaces between the solid domain and the fluid domain.

14.B.7: Setting Solver Control

1. Click Solver Control .

2. Under Convergence Control, set:

a. Timescale Control to Physical Timescale

b. Physical Timescale to 2 [s]

This is a particular fraction of the domain length divided by the inlet

velocity.

c. Max. No. Iterations to 100

d. Solid Timescale Control to Auto Timescale

For the Convergence Criteria, an RMS value of at least 1e-05 is usually

required for adequate convergence, but the default value is sufficient for

demonstration purposes. See "Judging Convergence" on page 364 in the

document "CFX-5 Solver Modelling" for more details.

3. Click OK to set the solver control parameters.

14.B.8: Writing the Solver (.def) File

1. Click Write Solver (.def) File .

2. Leave Operation set to Start Solver Manager.

3. Turn on Report Summary of Interface Connections.

4. Click OK.
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Since this tutorial uses a solid domain, domain interfaces are created

automatically between the fluid and solid regions. Report Summary of

Interface Connections was turned on and therefore an information

window is displayed that informs you of the connection type used for each

domain interface. See "Connection Types" on page 127 in the document

"CFX-5 Solver Modelling" for details.

5. Click OK in the information window.

6. Select File > Quit from the CFX-Pre main menu.

7. Click Yes when asked if you want to save the CFX file.
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Conjugate Heat Transfer in a Heating CoilObtaining a Solution



14.C: Obtaining a Solution

When the CFX-Solver Manager has started, obtain a solution to the CFD

problem by clicking Start Run. While the calculations proceed, you can see

residual output for various equations in both the text area and the plot area.

Use the tabs to switch between different plots (e.g. Heat Transfer,

Turbulence Quantities, etc.) in the plot area. You can view residual plots for

the fluid and solid domains separately by editing the Workspace

Properties (start from the Workspace menu). See "Monitors: Plot Lines" on

page 27 in the document "CFX- Solver Manager" for details.

When the CFX-Solver has finished:

1. Click OK.

2. Click Post-Process Results .

3. When Start CFX-Post appears, turn on Shut down Solver Managerthen clickOK.
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Conjugate Heat Transfer in a Heating CoilViewing the Results



14.D: Viewing the Results

This tutorial introduces conjugate heat transfer to the modelling capability

of CFX-5.

When CFX-Post has loaded, look at the default graphics objects that have

been created in the Object Selector. You should see the following namedBoundaries in the object tree:

Default 1 Side FluidZone Part 1

Default 1 Side SolidZone Part 2

FluidZone Default

SolidZone Default

inflow

outflow

The boundaries with the Default suffixes are automatically generated by

CFX-Pre on unspecified boundaries. SolidZone Default and FluidZoneDefault refer to the wall boundary conditions between the solid domains,

fluid domains, and the outside world. Default 1 Side FluidZone Part 1 and

Default 1 Side SolidZone Part 2 refer to the fluid-side and solid-side

boundaries respectively at the fluid-solid interface.

Some interesting plots may be obtained by doing the following:

Colour Default 1 Side FluidZone Part 1 by Temperature or

Wall Heat Transfer Coefficient.

Leave the visibility ofDefault 1 Side FluidZone Part 1 turned on andturn on the visibility for Default 1 Side SolidZone Part 2. Change the

Face Culling on the Render panel to Front Faces for both of these

regions. Since domain boundaries always have normal vectors that

point out of the domain, this removes the faces visible from the outside

of each domain and leaves the faces visible from the inside of each

domain. The fluid side of the interface is now coloured according to the

colouring for Default 1 Side FluidZone Part 1 and the solid side of the

interface is coloured according to the colouring for Default 1 Side

SolidZone Part 2. You can see how face culling works by turning off thevisibility of one of the surfaces, then rotating the view, paying particular

attention to the ends of the coil. For more information, see "Face

Culling" on page 20 in the document "CFX-Post".

Create a YZ Plane passing through X = 0 and then colour that Plane by

Temperature using a User Specified range of300 [K] to 305 [K].

Use Flat Shading (available on the Render panel under Draw Mode).

On the Colour panel, switch between using Conservative and Hybrid
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values for Temperature. As you do this examine the change in the YZ

Plane at the interface between the solid heating coil and the

surrounding fluid. This behaviour is explained in "Hybrid and

Conservative Variable Values" on page 29 in the document "CFX-Post".

On the Colour panel for the previously-defined YZ Plane, set Range to

Local, then try colouring by different variables.

On the Colour panel for the previously-defined YZ Plane, set Range to

Global, then alter the Domains field on the Geometry panel. Turn off

any graphics objects that hide the inside of the coil.

Create an XY plane at Z = 2.24. Colour by Temperature using a Local

range. You will see that the exit Temperature distribution is uneven

due to the shape of the heating coil, with more heat transfer occurring

on the high-Y side of the domain.

14.D.1: Creating a Cylindrical Locator

Next, you will create a cylindrical locator close to the outside wall of the

annular domain. This can be done by using an expression to specify radius

and locating a particular radius with an isosurface.

To create theexpression

1. Click Create expression .

1. Set Name to expradius.

2. In the Definition box, type the following expression:

(x^2 + y^2)^0.5

3. Click Apply to create the expression.
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To create thevariable

1. Click Create variable and set Name to radius.

2. Set Expression to expradius and then clickApply.

To create anIsosurface ofthe variable

1. Click Create isosurface and accept the default name Isosurface 1.

The maximum radius is 1 m, so creating a cylinder locator at a radius of

0.8 m is suitable.

2. Set Variable to radius and Value to 0.8.

3. On the Colour panel, set:

a. Mode to Variable

b. Variable to Temperature

c. Range to User Specified

d. Min to 300 [K]

e. Max to 302 [K]

4. Click Apply.

The cylinder will be visible.

An easier and more powerful way of creating cylinders is described in

"Surface of Revolution" on page 87 in the document "CFX-Post".

14.D.2: Specular Lighting

Specular lighting is on by default. To see the effect of specular lighting, turn

offLighting and Specular on the Render panel for the Isosurface (Do notforget to clickApply.). Specular lighting allows glaring bright spots on the

surface of an object, depending on the orientation of the surface and the

position of the light.

The light source can be moved in one of two ways.

If using Standalone: To move the light source, start with the mouse pointer

somewhere in the viewer area, then hold down the key and click and

drag using the right mouse button.

If using Workbench:To move the light source, press and hold Shift and then

press the arrow keys left, right, up or down.

For more information on conjugate heat transfer in CFX-5, see "Conjugate

Heat Transfer" on page 24 in the document "CFX-5 Solver Theory".
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Conjugate Heat Transfer in a Heating CoilExporting the Results to ANSYS



14.E: Exporting the Results to ANSYS

This optional step involves generating ANSYS .cdb data files from theresults

generated in the CFX-Solver. The stress analysis to be carried out in ANSYS

will measure the combined effects of thermal and mechanical stresses on

the solid heating coil using the Multifield Solver.

Important:This method requires that you have a Multiphysics license for

ANSYS. If you are unsure whether you have the required license, pleaseconsult your ANSYS customer support representative.

There are two possible routes when exporting data to ANSYS. The method

used in this section uses the CFX-Solver Manager export utility and the

ANSYS Multiphysics application to carry out a stress analysis on the solid

heating coil. Instructions for this method can be followed from Exporting

Data from the CFX-Solver Manager (p. 322).

The second method uses CFX-Post to export data (see Export (p. 60)) and

involves the following steps:

Importing a surface mesh from ANSYS into CFX-Post, and associating

the surface with the corresponding 2D region in the CFX-5 results file.

Exporting the data to a file containing SFE commands that represent

surface element thermal or mechanical stress values.

Loading the commands created in the last step into ANSYS and

visualising the loads.

14.E.1: Exporting Data from the CFX-Solver Manager

As the heat transfer in the solid domain has been calculated in CFX-5, the 3D

thermal data will be exported to an ANSYS element type 70 results file. The

mechanical stresses are calculated on the liquid side of the liquid-solid

interface. These values will be exported as 2D data to an ANSYS element 154

type results file.

1. Start the CFX-Solver Manager.

2. Select Tools > Export to ANSYS Multifield.
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3. The first step is to export 3D thermal data. Set the following on the

Export to ANSYS Multifield form:

a. Results File to HeatingCoil_001.res

The Export File field is automatically filled in.

b. Edit the file name by appending_70 to the end of the name that

appears in the Export File box. (The file should be calledHeatingCoil_001_ansysfsi_70).

c. Domain to SolidZone

d. Leave the Boundary box empty

e. ANSYS Element Type to 3D Thermal (70).

f. Leave the Output Modifiers at the default settings.

g. Click Export.

4. When the exportis complete,clickOK to acknowledge the message and

then set the following:

a. Domain to FluidZone

b. Export File to HeatingCoil_001_ansysfsi_154

c. Boundary to Default 1 Side FluidZone Part 1

d. ANSYS Element Type to 2D Stress (154)

e. Click Export

This completes the export stage of the tutorial.

14.E.2: Processing the Results in ANSYS: GUI method

Command-line instructions are also available for the following steps. To

follow those instructions instead, continue reading from Processing the

Results in ANSYS: Command Line method (p. 335).

The ANSYS main menu is similar to the workspaces in CFX-5, and contains a

tree structure with expandible categories based on processes, to readily

access aspects of the simulation. The Utility Menu is similar to the Main

Menu Bar in CFX-5, containing utility functions that are available

throughout the ANSYS session, such as file controls, selecting, graphics

controls, and setting parameters.

Starting ANSYS

1. Start ANSYS Multiphysics from the ANSYS launcher.

The mesh itself has already been generated and is provided for use in the

following steps. The data files created in the previous steps will be used.


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PreProcessing

1. In the ANSYS Main Menu, go to Preprocessor > Checking Ctrls >

Shape Checking. Set Level of shape checking to Off, then clickOK.

You will receive a warning message: clickClose to ignore it for this case.

2. Copy the mesh fileHeatingCoil_solid92.cdb from the examples

directory to your working directory.3. Go to Preprocessor > MultiField Set Up > Import. On the MFS Import

form, set:

a. Field number to 3

b. Option to db

c. Import File Name to HeatingCoil_solid92.cdb

4. Click OK.

Note: Keep the .cdb file in your working directory (without spaces in thename) if working on a pc.

5. In the Utility Menu, select List > Properties > Element Types to verify

that the cdb file was imported correctly. Then clickClose to close the

window.


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6. To set the material properties, in the Main Menu go to Preprocessor >

Material Props > Material Models, then:

a. Under Favorites > Linear Static > Density, set DENS to 8933

b. Under Favorites > Linear Static > Linear Isotropic, set EX to

1.1e11 and PRXY to 0.35.

c. Under Favorites > Linear Static > Thermal Expansion, setReference temperature to 300 [K] and ALPX to 1.65e-5.

d. Under Thermal > Conductivity > Isotropic, set KXX to 401.

e. Under Thermal > Specific Heat, set C to 385.

f. Click Material > Exit to close the window.

7. In the Utility Menu, select List > Properties > All Materials to verify the

above settings.

8. Click Close to close the window.

9. In the Utility Menu, select Select > Comp/Assembly > Select

Comp/Assembly.

a. Select by component name and clickOK.

b. On the Select Component or Assembly form, set Name to END_1

and Type to From full set.

c. Click Apply.

d. Repeat step (a).

e. On the Select Component or Assembly form, set Name to END_2,

but with Type set to Also Select.

f. Click OK.


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10. In the Main Menu, go to Preprocessor > Loads > Define Loads > Apply

> Structural > Displacement > On Nodes.

a. Click on Pick All.

b. On the Apply U,ROT on Nodes form, select All DOF.

c. Click OK.

11. In the Utility Menu:

a. Select Select > Comp/Assembly > Select All.

b. Select Select > Everything.

c. Select Select > Entities.

d. Set fields up as shown in the figure below.

Figure 1:

e. Click Sele All.

f. Click OK.


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12. In the Main Menu, go to Preprocessor > Loads > DefineLoads > Apply

> Field Volume Intr > On Elements.

a. Click Pick All.

b. On the Apply FVIN on Elements form, set VAL1 to 1.

c. Click OK.

13. In the Utility Menu, select Select > Comp/Assembly > SelectComp/Assembly.

a. Choose by component name and clickOK.

b. On the Select Component or Assembly form, set

Name to HELIX

Type to From Full Set

c. Click OK.

14. In the Main Menu, go to Preprocessor > Loads > DefineLoads > Apply> Field Surface Intr > On Nodes.

a. Click Pick All.

b. On the Apply FSIN on nodes form set VALUE to 1.

c. Click OK.

15. In the Utility Menu:

a. Select Select > Comp/Assembly > Select All.

b. Select Select > Everything.

16. In the Main Menu, go to Preprocessor > MultiField Set Up > Import.

On the MFS Import form, set:


b. Option to db

c. Import File Name to

HeatingCoil_001_ansysfsi_154.cdb

17. ClickOK.



that the cdb file was imported correctly.

19. ClickClose to close the window.


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20. In the Utility Menu, select Select > Entities.

a. Set the fields up as shown in "Figure 1:" on page 326, except type

surf154 as the element name.

b. Click Sele All.

c. Click OK.

21. In the Utility Menu, select Select > Entities.a. Set the fields to Nodes, Attached To, and Elements.

b. Click OK.

22. In the Main Menu, go to Preprocessor > Loads > Define Loads > Apply

> Field Surface Intr > On Nodes.

a. Click Pick All.

b. On the Apply FSIN on Nodes form, set VALUE to 1.

c. Click OK.23. In the Utility Menu, select Select > Everything.

24. In the Main Menu, go to Preprocessor > MultiField Set Up > Import.

On the MFS Import form, set:


b. Option to db

c. Import File Name to HeatingCoil_001_ansysfsi_70.cdb

25. ClickOK.



that the cdb file was imported correctly. ClickClose to close the

window.

27. Go to the input field at the top of the GUI and type:

esel,s,type,,1

Thisisthesameasthestepsyoufollowedinsteps9and16,butdonevia

the command line.


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28. In the Main Menu, go to Preprocessor > Loads > DefineLoads > Apply

> Field Volume Intr > On Elements.

a. Click Pick All.

b. On the Apply FVIN on Elements form, set VAL1 to 1.

c. Click OK.

29. In the Utility Menu, select Select > Everything.

30. In the Main Menu, go to Preprocessor > MultiField Set Up > Setup >

Global. Set the fields to match the figure below and clickOK.


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31. In the Main Menu, select Preprocessor > MultiField Set Up > Setup >

Order. Set the fields to match the figure below and clickOK.

32. In the Main Menu, go to Preprocessor > MultiField Set Up > Setup >

External. Select 1 and 2, as shown in the figure and clickOK.


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33. In the Main Menu, go to Preprocessor > MultiField Set Up > Interface

> Surface. Set the fields to match the figure below and clickOK.

34. In the Main Menu, go to Preprocessor > MultiField Set Up > Interface

> Volume. Specify TEMP, 2, 3, and 1 as shown below and clickOK.

35. Inthe MainMenu, goto Preprocessor > MultiField Set Up > TimeCtrl.

Set:

a. MFIT to 1

b. MFDT to 1

c. MFRS to 0


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36. In the Main Menu, go to Preprocessor > MultiField Set Up > Stagger

> Max Iterations.

37. Set MFIT to 1.

38. In the Main Menu, go to Preprocessor > MultiField Set Up > Stagger

> Relaxation.

39. Select FORC and TEMP, as shown below and clickOK.

40. In the pop-up window, set both the FORC and TEMP Relaxation values

to 1.0, and then clickOK.

41. In the Main Menu, go to Preprocessor > MultiField Set Up > Clear.

Specify SOLU and clickOK.

42. In the Utility Menu, select File > Save As and specify a convenient

location and filename.


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Solution

43. In the Main Menu, go to Solution > Solve > Current LS (Current Load

Step).

44. ClickOK.

45. The results have also been provided. To access the results file, copy

HeatingCoilANSYSResults.rst from the examples directory toyour working directory.

14.E.3: PostProcessing

1. In the Utility Menu, select File > Clear & Start New. When you get a

verify message asking you to confirm the /clear command, choose

Yes.

2. In the Main Menu, go to General Postproc > Data & File Opts.a. Under Data to Be Read, select All items.

b. Enable the Read single result file toggle.

c. Browse to the HeatingCoilANSYSResults.rst file.

d. Click OK.

3. In the Main Menu, select General Postproc > Read Results > Last Set.

4. Click Yes on the verify message.

5. Click on the Isometric View icon on the right-hand toolbar.

6. From the Utility Menu, select PlotCtrols > Style > Edge Options.

a. Set Element outlines for non-contour/contour plots, to Edge

only/All.

b. Click OK.


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7. In the Utility Menu, select Plot > Results > Deformed Shape. Select Def

+ undeformed (deformed and undeformed), and then clickOK. This

gives a scaled displacement output, not the actual displacements

(which are very small).

8. In the Utility Menu, select Plot > Results > Contour Plot > Elem

Solution.

a. Click Stress to get a list of available stresses.

b. Scroll down to select von Mises stress.

c. Choose Deformed shape with undeformed model.

d. Click OK.


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9. To view an animation, go to the Utility Menu and select PlotCtrls >

Animate > Deformed Shape.

a. Choose Def shape only.

b. Click OK.

An avi named HeatingCoilAnimation.avi has been added

to the examples directory. Copy the file to your working directory ifyou wish to view it.

c. Click Close in the Animation Control window to stop the animation

and close the window.

10. In the Utility Menu, select List > Results > Options.

11. In the Results coord system field, select Global cylindric, and clickOK.

12. In the Main Menu, go to General Postproc > Plot Results > Contour

Plot > Element Solu.

a. Click Stress to get a list of stresses.

b. Select X-Component of stress.

Note that although you are choosing the X component, because of

the rotated coordinate system, this is, in reality, the R component.

c. Choose Deformed shape with undeformed model, and clickOK.

14.E.4: Processing the Results in ANSYS: Command Line

method

As an alternative to running the GUI method, the following command line

arguments can be run to achieve the same results as the GUI method:


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/batch,list

/prep7

shpp,off

!read in HeatingCoil_solid92.cdb physics ANS_STRUC

mfim,3,db,HeatingCoil_solid92,cdb

etlist!set material properties for copper

mp,ex,1,1.1e11

mp,alpx,1,1.65e-5

mp,dens,1,8933

mp,kxx,1,401

mp,c,1,385

mp,prxy,1,0.35

mplist

!dirichlet bc

cmsel,s,end_1,node

cmsel,a,end_2,node

d,all,ux

d,all,uy

d,all,uz

cmsel,all

allsel

!volumetric interface

esel,s,type,,1

bfe,all,fvin,,1

!surface interface

cmsel,s,helix,node

sf,all,fsin,1cmsel,all

allsel

!read in cfx pressure physics CFX_PRES

mfimp,1,db,HeatingCoil_001_ansysfsi_154,cdb

etlist

!surface interface


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esel,s,type,,1

nsle,s,1

sf,all,fsin,1

alls

!read in CFX solid thermal physics CFX_HEAT

mfimp,2,db,HeatingCoil_001_ansysfsi_70,cdbetlist

!volumetric interface

esel,s,type,,1

bfe,all,fvin,,1

allsel

finish

/solu

etlist

mfan,on

mfor,1,2,3

mfti,1

mfdt,1

mfin,cons

mfclear,solu

mfsu,1,1,forc,3

mfvo,1,2,temp,3

mfex,1,2

mfit,1

mfre,temp,1.0

mfre,forc,1.0

mfbuc,on,50.0

mflistsave

solve

finii

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