Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.
Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.
Fail to simulate 2 physics together
Posted Nov 26, 2012, 3:26 p.m. EST Modeling Tools & Definitions, Parameters, Variables, & Functions Version 4.3a 1 Reply
Please login with a confirmed email address before reporting spam
Hello,
I am trying to simulate a model which has both solid mechanics and magnetic field modules. I can simulate two physics seperately, but every time they are connected, an error returns:
Segregated group 1
Failed to evaluate variable Jacobian.
- Variable: mod1.curlAz
- Geometry: 1
- Domain: 1
Here I attached a simple coupled model. Could anyone help me with it? Thanks
I am trying to simulate a model which has both solid mechanics and magnetic field modules. I can simulate two physics seperately, but every time they are connected, an error returns:
Segregated group 1
Failed to evaluate variable Jacobian.
- Variable: mod1.curlAz
- Geometry: 1
- Domain: 1
Here I attached a simple coupled model. Could anyone help me with it? Thanks
Attachments:
1 Reply Last Post Nov 27, 2012, 10:56 a.m. EST
Please login with a confirmed email address before reporting spam
Posted:
1 decade ago
COMSOL support solved this problem:
The error is caused by a conflict in the handling of frames. The physics
interfaces in Comsol can be usually solved either in a Solid material
("Material" frame) or in a Non-solid material ("Spatial" frame).
Electromagnetic interfaces are however an exception, since they require a
special treatment in presence of deformations (for example, Lorentz
currents must be added to moving conductors).
Therefore, in the current version, the electromagnetic interfaces require
that the "Material type" setting is consistent in all the features (either
Solid or Non-solid) and with the frame selected in the physics node.
In your model, it is sufficient to change the Material type in Ampère's
Law to Non-solid.
The error is caused by a conflict in the handling of frames. The physics
interfaces in Comsol can be usually solved either in a Solid material
("Material" frame) or in a Non-solid material ("Spatial" frame).
Electromagnetic interfaces are however an exception, since they require a
special treatment in presence of deformations (for example, Lorentz
currents must be added to moving conductors).
Therefore, in the current version, the electromagnetic interfaces require
that the "Material type" setting is consistent in all the features (either
Solid or Non-solid) and with the frame selected in the physics node.
In your model, it is sufficient to change the Material type in Ampère's
Law to Non-solid.