How to reuse the result of a previous simulation as an input for the second simulation?

Please login with a confirmed email address before reporting spam

Hi, I am looking for the steps needed to reuse a deformed hyperelastic shape with stress results created in response to a prescribed displacement, for a second simulation with new boundary conditions. Thank you in advance,


5 Replies Last Post 15 Apr 2020, 22:12 GMT-4
Henrik Sönnerlind COMSOL Employee

Please login with a confirmed email address before reporting spam

Posted: 2 months ago 19 Mar 2020, 03:30 GMT-4

Hi Montassar,

Exactly what type of change is it that you are going to do to the boundary conditions?

-------------------
Henrik Sönnerlind
COMSOL
Hi Montassar, Exactly what type of change is it that you are going to do to the boundary conditions?

Please login with a confirmed email address before reporting spam

Posted: 2 months ago 19 Mar 2020, 12:38 GMT-4

Hi Mr Henrik

I am just trying to Disable the Prescribed Displacement of Study 1 Enable the Fixed Constraint Boundary Load of Study 2, and apply to the deformed shape with stress results of Study 1.

Hi Mr Henrik I am just trying to Disable the **Prescribed Displacement** of *Study 1* Enable the **Fixed Constraint** **Boundary Load** of *Study 2*, and apply to the deformed shape with stress results of *Study 1*.


Henrik Sönnerlind COMSOL Employee

Please login with a confirmed email address before reporting spam

Posted: 2 months ago 20 Mar 2020, 10:57 GMT-4

This is not trivial. Removing a constraint will for example usually give some springback.

Things are also very different if for example plastic deformations are involved (since for an elastic problem, the path to the final state is not interesting).

One way of removing a constraint smoothly is to implement it using a penaly formulation, and gradually remove the penalty factor. See also https://www.comsol.com/blogs/how-to-make-boundary-conditions-conditional-in-your-simulation

-------------------
Henrik Sönnerlind
COMSOL
This is not trivial. Removing a constraint will for example usually give some springback. Things are also very different if for example plastic deformations are involved (since for an elastic problem, the path to the final state is not interesting). One way of removing a constraint smoothly is to implement it using a penaly formulation, and gradually remove the penalty factor. See also

Please login with a confirmed email address before reporting spam

Posted: 2 months ago 4 Apr 2020, 11:15 GMT-4

Hi, I would like to simulate the band gap of a deformed phononic crystal. Firstly, I will simulate the deformation of the porous structure under the external load, and then, the deformed structure with initial stresses can be useded as the new geometric input for the next step. I see the details in the following blog post: www.comsol.com/blogs/how-to-reuse-a-deformed-shape-as-a-geometry-input/. However, when I use this technique, several strange lines are at the surface of the input model. Moreover, this input model has no initial stresses. So how can I export the deformed structure with initial stresses for next study? Do you have other methods? Thanks in advance. Best regards, Haishan Tang

Hi, I would like to simulate the band gap of a deformed phononic crystal. Firstly, I will simulate the deformation of the porous structure under the external load, and then, the deformed structure with initial stresses can be useded as the new geometric input for the next step. I see the details in the following blog post: www.comsol.com/blogs/how-to-reuse-a-deformed-shape-as-a-geometry-input/. However, when I use this technique, several strange lines are at the surface of the input model. Moreover, this input model has no initial stresses. So how can I export the deformed structure with initial stresses for next study? Do you have other methods? Thanks in advance. Best regards, Haishan Tang


Please login with a confirmed email address before reporting spam

Posted: 2 months ago 15 Apr 2020, 22:12 GMT-4

Hi Haishan Tang In fact, your question is what I'm looking for. unfortunately, so far I haven't been able to find an answer, maybe Mr. Henrik's suggestions might help, but I think it is not the exact or simplest way to solve the problem. Now I wonder if comsol has this feature in the first place.

Hi Haishan Tang In fact, your question is what I'm looking for. unfortunately, so far I haven't been able to find an answer, maybe Mr. Henrik's suggestions might help, but I think it is not the exact or simplest way to solve the problem. Now I wonder if comsol has this feature in the first place.

Reply

Please read the discussion forum rules before posting.

Please log in to post a reply.

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.