And welcome to this video
on setting up a two way coupling
for an electrothermal management an ETM
using Ansys HFSS and Icepak
in the AEDT Student version.
In the previous videos
we have
discussed how to setup a one way coupling
for an electrothermal analysis
using an automated wizard
and an step by step approach.
In this video
we're going to show you how to setup
the two way coupling simulation
from the one way coupled setup
in the AEDT Student version.
We'll see how to set this up
using the EMtoIcepak ACT extension
as well as the step by step method.
Let's get started!
Here is the AEDT Student version interface
showing the twisted WR-15 waveguide
simulation model
used for the one way coupled analysis
and additional step
in the HFSS design is needed
to do the two way analysis.
So, copy and paste the HFSS design
in the same project.
Change the design name
to something to easy identify it.
Confirm that the HFSS design
for the two way coupled analysis.
Look in the history tree windows
Expand the model and solids category,
right mouse click on the aluminum material
and select its properties.
The thermal modifiers need to be set
for the materials
in order to do the two way coupling.
The thermal modifiers define
how the material properties
change with temperature
and when you use the thermal modifier data
from the Ansys material database
or the information from the
specific material supplier or manufacturer.
To define that thermal modifier
click on View/Edit material button
and in that popup window
the electrical properties are displayed.
Click the checkbox
next to the thermal modifier
to view the thermal modifier column
and since the resistivity of the conductors
is temperature dependent,
the thermal modifier for bulk conductivity
needs to be defined.
Click on the thermal modifier cell
corresponding to the conductivity
and select edit.
A window for the thermal modifier pops up.
You can either use the expression form
or the quadratic form
by using the respective radio button
and you can edit the default equation
or import or create a
temperature dependent dataset.
Under quadratic form you can either use
the basic coefficient set
or advanced coefficient set option
or again update the thermal modifier
with the supplier or manufacturer data.
Click OK to accept the changes
in the thermal modifier
and you'll notice the thermal modifier is set.
Click OK to accept the changes.
In a similar way you can also edit
the thermal modifier for the relative permittivity
and the dielectric loss tangent
material properties for the FR4.
In the project manager window right mouse click
on the HFSS design for two way coupling
and select 'Set Object Temperature'.
In the popup window
check 'Include Temperature Dependence'
to enable the temperature dependence
for the HFSS design.
Check the enable feedback box
to enable the loop for two way coupling
and now the HFSS design is ready
for the two way coupled analysis.
Go ahead and launch the EMtoIcepak
ACT extension in the wizard page,
select the design, the simulation type,
the mesh settings as shown
in the one way coupled video
that uses the EMtoIcepak toolkit.
Navigate to the two way coupling section,
select 'Yes' for two way coupling.
Input the number of iterations
and we'll keep the default number.
Select 'Yes' to continue
the Icepak iterations during coupling.
Input the max number of iterations.
Again we'll keep the default.
Click on launch to generate the model.
Go ahead and watch the windows open
and autogenerate your Icepak model geometry
with the required setup
as generated from the wizard selections.
Click on finish to exit the wizard
and close the ACT extension.
Use ctrl+D in the 3D modeler window
to fit the whole model geometry.
In the project manager window,
click on the Icepak design
and feel free to rename it.
Modify the existing solution setup
as done in the one way coupling.
Select OK to accept the changes
and under the solution setup
you can see a two way coupling
option is now added.
Double click on the solution setup
to view the options that were set
as selected from the EMtoIcepak wizard.
For the step by step procedure
copy and paste the one way coupled
Icepak design and then rename it accordingly.
In the project manager window
expand thermal category
Double click on
Surface and volumetric EM Loss 1.
In the popup window click on setup link.
A new window pops up
Click on edit link
change the HFSS design to feedback one.
In the variable mapping tab
click on map variable by name.
Click OK to accept the changes
Expand analysis category
right mouse click on the solution setup
select two way coupling
then choose the same options
as in the ACT extension.
Right mouse click on setup1
and select analyze to start the analysis
and during or at the end of the analysis
go ahead and right mouse click on the setup1
and select residual to look at the convergence
and after the first coupling iteration
you may notice a spike
showing the adjustment in the temperature
and this flattens out as the iteration progress
until that convergence is reached
and after the solution is converged
go to the profile tab to view the solution profile.
Browse through the profile to find
mapped EM losses
and you will see an increase
in the mapped EM loss
as compared to the one way coupled model
and this increase the losses
due to the temperature dependence
of the material properties of the geometry
therefore the resulting temperature
will also increase.
The two way coupled results
will be closer
to the experimental results
when compared to that of the one way analysis.
You can notice that there's no change
in the velocity plot from the one way analysis.
So in this video, we've shown you
how to perform
a two way coupled ETM
electrothermal management workflow
and with this video we have completed the
electrothermal management ETM
using Ansys HFSS and Icepak.
For more videos on HFSS or Icepak
or any of the Ansys simulation tools
please visit courses.ansys.com today.