comsol multiphysics intro models
DESCRIPTION
Comsol Multiphysics Intro ModelsTRANSCRIPT
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Introductory Models
Tutorials
Parallel plate capacitor
Thermal cube
Stresses in a wrench
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What you will learn
More experience with the interface
Sketching geometries in COMSOL
How to have a domain not active in the analysis
Tutorial 1: Parallel Plate Capacitor
More Practice with the User Interface
Adding a 2nd Physics
Adding Thermal Expansion
Tutorial 2: Thermal cube
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What you will learn
Hands on with the interface
The basic steps in all COMSOL models
How to show deformed plots
Tutorial 3: Stresses in a Wrench
Tutorial 4: Electrical Heating and
Thermal Stresses in a Busbar
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What you will learn
More experience with the interface
Sketching geometries in COMSOL
How to have a domain not active in the analysis
Tutorial 1: Parallel Plate Capacitor
Select 2D
AC / DC > Solid Mechanics
Stationary
Checkered flag to Finish
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Create Geometry
Open Model 1
Pick Geometry 1
Change Length Unit to cm
Draw Three Rectangles
Set Materials
Right Click on Materials
Choose Open Model Library
Pick Built-In Material Library
Select Air
Right Click on it, Add to Model
(This will assign it to all subdomains
but we will only use it in the air
domain: Electrodes will not be
included in the analysis)
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Electrostatics Active only in Air Domain
Pick Electrostatics in Model Builder
Clear all Selections (hit X )
Only Select Air Domain
Right-click to confirm
Set Boundary Condition Ground
Right-Click Electrostatics
Choose Ground
Choose Box Selection
Select Bottom Electrode
Confirm
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Set Boundary Cond Electric Potential
Right-Click Electrostatics
Choose Electric Potential
Set to 100 Volts
Choose Box Selection
Select Top Electrode
Mesh Free Triangular (Extra Fine)
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Solve
Pick Study 1
Hit =
More Practice with the User Interface
Adding a 2nd Physics
Adding Thermal Expansion
Tutorial 2: Thermal cube
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Choose Physics and Study
Choose File > New
Select 3D
Select Heat Transfer in Solids in Physics
Choose Stationary under Study
Draw Geometry
Right click on Geometry
Choose Block
Leave as 1 x 1 x 1 [m]
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Set Materials
Right click on Materials
Choose Open Material Library
Go to Built-in Section
Right Click on Aluminum 6063
Choose Add to Model
Assign it to the block
Set Boundary Conditions
Right Click on Heat Transfer
Select Convective Cooling
Choose All Boundaries
h = 1000 Text = 500
Right Click on Heat Transfer
Select Temperature
Choose bottom surface
Right click to confirm
Set Temperature as 300
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Mesh and Solve
Right Click on Mesh
Select Free Tetrahedral
Select Size
Choose Coarser mesh size
Right Click on Study
Select Compute
Add Structural Equations
Right Click on model 1 node
Choose Add Physics
Open Structural Mechanics
Pick Solid Mechanics
Choose the finish (checkered) flag
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Add Thermal Expansion
Open Structural Mechanics in Model Tree
Right Click on Linear Elastic Material Model
Choose Thermal Expansion
Change Temperature from user defined to Temperature (ht/solid1)
Leave Ref Temperature as 293 K
Constrain Bottom Surface + Solve
Right Click on Solid Mechanics
Choose Fixed Constraint
Select & Confirm bottom surface
Right Click on Study
Pick Compute
Open 3D Plot group 1
Right Click on Surface
Add Deformation
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What you will learn
Hands on with the interface
The basic steps in all COMSOL models
How to show deformed plots
Tutorial 3: Stresses in a Wrench
1) Set Dimensions, Physics & Study-Type
Select 3D
Structural Mechanics > Solid Mechanics
Stationary
Then the checkered flag to Finish
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2) Import Geometry
Right click on Geometry
Choose Import Then Browse
C:\COMSOL41\models\COMSOL_Multiphysics\Structural_Mechanics
Choose Wrench.mphbin
Import
3) Set Materials
In Model Builder:
Right Click on Materials
Open Model Library
Pick Built-In
Select High Strength Alloy Steel
Right Click, Add to Model
Select Steel AISI 4340
Right Click, Add to Model
Pick Bolt, right-click to add
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4 a) Constrain Bolt
In Model Builder:
Right Click on Solid Mechanics
Choose Fixed Constraint
In Graphics Window:
Pick the Bolt Cut End
Right Click to confirm
4 b) Add Load
In Model Builder:
Right click on Solid Mechanics
Choose Face Load
Pick end of the wrench
Enter F for Fz
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5) Mesh
In Model Tree:
Right Click on Mesh 1
Choose Add Tetrahedral
Pick Size
Change to Coarser
Right click Mesh 1
Pick Build All
6) Solve
In Model Builder:
Pick Study 1
Choose Compute
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Display Stress on Deformed Geometry
Open Results > 3D Plot Group 1
Pick Surface 1 > Replace Expression
Plot Von Mises Stress
Right click on Surface 1
Add Deformation
Tutorial 7: Electrical Heating
and Thermal Stresses in a Busbar
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Your first model
Exercises:
Electrical Heating in a Busbar
Bus bar made of copper.
Bolts made of titanium.
Direct current 10 mV from a transformer to an electric device.
Heat is produced due to the resistive losses--joule heating.
Calculate the thermal expansion.
Work though exercises, but not the appendix
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Your first training model: A Copper Busbar
A busbar is an electric current conductor typically found in high-
power applications.
You will investigate:
Joule Heating
Thermal Expansion
Flow with Cooling
for a certain busbar geometry
Boundary Conditions: Electric Currents
Electric Potential 10mV Ground
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Boundary Conditions: Heat Transfer
Cooling with a heat transfer coefficient
of 5 W/m^2/K and surrounding air
temperature at 293.15 K
The only difference between the hands-on and your problem is
Perhaps a few more physics
A bit more geometry
Some more loads & b.c.s
Go to it (!!!)
Now youre ready for your own simulations!
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Capture the ConceptTM
Questions & Answers