Comsol: Utilizing Symmetry Planes for Finer Grid

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In summary, the speaker has reduced the Degrees of Freedom (DoFs) of their structural model by using symmetry planes. They are having trouble telling Comsol that their model is only a quarter of the total. The speaker's subdomain has a fluid with a symmetry boundary condition and a solid with a plane symmetry. They are trying to find eigenfrequencies and have tried two methods, one with the complete geometry and one with a quarter of the geometry using symmetry constraints. However, the latter method resulted in much higher frequencies, possibly due to Comsol considering the constraints as external instead of symmetry planes.
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lucky_1809
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Hi
I realize a model that requires a very fine grid in comsol, so i have reduced the DoFs using symmetry planes. My structural model has 2 symmetry planes, so i have built a quarter of the total model, but now I don't know the way to tell to comsol that the realized model is only a quarter of the total...help me please!
 
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what is the phisics of your subdomain? I use a symmetry boundary condition for a fluid and plane symmetry (corrisponding to the goemetry plane's symmetry) for a solid.
 
  • #3
hello, forgive me for the delay in the answer but i was on holiday in cyprus, very beautiful place...My model is structural model with solid subdomain and shell subdomain, and I want to find eigenfrequencies... I tried to find eigenfrequencies in 2 ways...I realized the global geometry and after a slowly processing i found eigenfrequencies that are about the frequencies founded in experimental activity(the first f = 3.5Hz)..after i have built a quarter geometry and I put symmetry constraints like you told me, but I found very high frequencies (the first f = 1345 Hz). I supposed that comsol considers this constraints in a wrong way like an external constraint and not a symmetry plane.thank you
 

FAQ: Comsol: Utilizing Symmetry Planes for Finer Grid

What is Comsol and how is it used?

Comsol is a finite element analysis software that is used to simulate and analyze physical systems. It allows scientists and engineers to model and solve complex multiphysics problems using numerical methods.

How does utilizing symmetry planes in Comsol help with creating a finer grid?

Symmetry planes in Comsol allow for a reduction in the computational domain by exploiting the symmetry of the system. This results in a smaller and more efficient grid, which can lead to faster simulation times and more accurate results.

What types of systems benefit from using symmetry planes in Comsol?

Any system that exhibits symmetry can benefit from using symmetry planes in Comsol. This includes systems with rotational, translational, or mirror symmetries.

Are there any limitations to utilizing symmetry planes in Comsol?

While symmetry planes can greatly improve the efficiency of simulations, they are not suitable for all systems. For example, systems with irregular geometries or complex boundary conditions may not be able to use symmetry planes effectively.

Are there any best practices for utilizing symmetry planes in Comsol?

Yes, it is important to carefully consider the symmetry of the system and choose the appropriate symmetry planes. It is also recommended to validate the results by comparing them to a non-symmetrical simulation. Additionally, it is important to ensure that the boundary conditions are consistent with the chosen symmetry planes.

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