Discussion Forum

Hi

I beleive that most scalar variables (the ones of COMSOL) are now distributed in different subfields either in the study node or under adavanced in the physics

You can also turn on the sub node equations in the preferences

For you ovn variables you define them under Global or Model Definitions

Good luck
Ivar

Hi Ivar,I want to find the scalar variable (beta_rfwv) which is the propagation constant defined in perpendicular Hybrid-Mode Wave of Eigen Frequency Solver in RF model in COMSOL v3.5.But when I want to find it in COMSOL v4, I can not find such defined scalar variable in Eigen Frequency solver nor neither in equations view of physics.Maybe I am not carefully enough to find it.

Hi

yes I do neither not have a ull list of correspondance, but it shoulod look like rf.beta in V4, or replace rf by whatever physics name you are using (if they have not changed the name) unfortunately we cannot sort the name lines in the equations so one need to scan carefully all lines of the physics, and it could also b defined in one of the sub-nodes

Sorry do not know more mylsef ;)
Good luck
Ivar

Hi Liu;
Did you find your variable? I have the same issue.
thanks

Hi,

The "application scalar variables" dialog has disappeared in version 4. The corresponding input is handled in the following way:

* Physical constants like free space electrical permittivity and magnetic permeability are now built-in, non editable constants.

* User input parameters like frequency are specified in the study node.

The reason that you cannot find the "out-of-plane propagation constant" in any study node is because the type of eigenfrequency study that it would be associated with is not yet supported in version 4.

We plan to reintroduce it in a future version.

Best regards,

Magnus Olsson
COMSOL

Hi;
I can not find, where to set the frequency under the study node. Could any one help?
thanks
Mina

Hi

isnt it under the solver node ?

--
Good luck
Ivar

Hi:
Under solver node I have:

compile equation
dependent variable
solver setting

I am using a Stationary Direct solver.
I can not find the frequency.

Thanks
Mina

Here is what I did to change the frequency in Comsol 4.a:

In the "Model Builder" window, Right Top corner, there are small figures: triangle, rectangle and square which are :

view menu, Minimize and Maximize.

In "view menu" active "show more options "


My model Physics was "Electric current", I clicked on "Electric Current" to see th setting, and then clicked on the "equation" and changed my frequency.

Hope it be helpful

Mina