Number of points in mesh (Comsol 4.3b)

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Discussion Overview

The discussion revolves around understanding how Comsol Multiphysics 4.3b evaluates equations in a simulation involving a 3D sphere, specifically focusing on the number of points or mesh elements used in the computation.

Discussion Character

  • Technical explanation, Conceptual clarification

Main Points Raised

  • One participant seeks clarification on how many points Comsol uses for solving a simulation problem involving a sphere.
  • Another participant suggests that the question pertains to the number of mesh elements used by Comsol, indicating that this information is typically reported by the solver.
  • A different participant mentions that the number of elements can be found in the mesh statistics and that the number of degrees of freedom (DOF) is more indicative of simulation speed than the number of elements.
  • The original poster expresses gratitude for the clarification, acknowledging a misunderstanding about the point-wise solution approach.

Areas of Agreement / Disagreement

Participants appear to agree on the method of finding the number of mesh elements and DOF, but there is no explicit consensus on the original question regarding the evaluation points.

Contextual Notes

The discussion does not resolve the initial misunderstanding about how Comsol evaluates equations, as it remains unclear whether the original poster fully grasps the distinction between mesh elements and evaluation points.

Who May Find This Useful

Users of Comsol Multiphysics, particularly those new to the software or working with mesh configurations in simulations.

VIEX12
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Hello everybody. I'm new with Comsol and I'm working with the 4.3b version. I'm trying a simulation of a sphere (in 3D, of course) and I want to figure out in how many points is Comsol evaluating the ecuation. I know I set the maximum and minimum size of the tetrahedrals (I'm using tetrahedrals in this case), but I don't know how many points is Comsol considerating for solving the problem. I'd be glad if anyone could help me. Thank you very much!
 
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I am not sure I quite understand the question.
Are you asking how to find out how many mesh elements Comsol is using?
I am pretty sure that is reported by the solver.

A FEM solver does not solve at really solve at "points" as such, it uses the mesh elements as base functions.
 
You can see the number of elements by going mesh>statistics. You can also see the number of DOF in the messages tab when the simulation is running. The number of DOF tells you more about the speed of the simulation than the number of elements.
 
Thank you very much! I thought it solved it point by point, but I was wrong. Thank you both f95toli & bp_psy for your answers!
 

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