A geometry question in Comsol (draw a semi-circle tangent to a line)

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Discussion Overview

The discussion revolves around using Comsol for drawing geometries, specifically a semi-circle tangent to a line, in the context of modeling a Tesla valve. Participants explore the capabilities of Comsol compared to other software like SolidWorks, Abaqus, and Ansys, particularly in relation to solid mechanics, thermodynamics, and computational fluid dynamics (CFD).

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant expresses difficulty in drawing a semi-circle tangent to a line in Comsol and questions the software's current relevance.
  • Another participant mentions a "Tangent" option in Comsol's Geometry toolbar and suggests that it may be easier to create geometry in CAD software and import it into Comsol.
  • Some participants argue that Comsol is not outdated, citing a recent version release, but note its unpopularity due to high costs and a focus on less commonly simulated phenomena.
  • Concerns are raised about Comsol's capabilities in solid mechanics and CFD, with some participants suggesting that other software like Abaqus or Ansys may be superior for these applications.
  • One participant inquires about the advantages and disadvantages of using Comsol for thermodynamics and CFD projects.
  • Another participant asserts that Comsol is generally not recommended for solid mechanics problems beyond simple cases and highlights its weaknesses in CFD due to its use of FEM instead of FVM.
  • However, some participants acknowledge that Comsol performs well in thermodynamics simulations.

Areas of Agreement / Disagreement

Participants express differing opinions on the suitability of Comsol for various applications, particularly in solid mechanics and CFD. There is no consensus on whether Comsol is the best choice for these areas, with multiple competing views presented.

Contextual Notes

Participants note limitations in Comsol's modeling capabilities and suggest that the choice of software may depend on the specific simulation needs, indicating that assumptions about software performance may vary based on user experience and project requirements.

yabi
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TL;DR
How can draw a semi-circle tangent to a line in Comsol?
I am new to Comsol. I want to draw my model which is a Tesla valve. The geometry is little complicated and I don't know how to draw a semi-circle tangent to a line. Is it possible? I draw it in Solidworks and imported it into Comsol but it gives error and I think it is better to draw inside Comsol from scratch.

BTW the newest thread about Comsol in this forum dates back to 2015. Is Comsol outdated and has no usage these days? Why it is not among active topics?
 
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There is a „Tangent” option in Comsol’s Geometry —> Operations toolbar for 2D drawings. Just keep in mind that this software has limited capabilities when it comes to modeling and it might be easier to create geometry in CAD software and the import it to Comsol (maybe you should use different format or change the way you model parts in SolidWorks).

Comsol is not outdated. In fact, recently new version was released. It’s just quite unpopular (mostly used by universities) because of it’s high price and focus on less commonly simulated phenomena such as optics and electromagnetics. Also, its more advanced solid mechanics capabilities (such as contact) are worse than those of Abaqus or Ansys.
 
FEAnalyst said:
There is a „Tangent” option in Comsol’s Geometry —> Operations toolbar for 2D drawings. Just keep in mind that this software has limited capabilities when it comes to modeling and it might be easier to create geometry in CAD software and the import it to Comsol (maybe you should use different format or change the way you model parts in SolidWorks).

Comsol is not outdated. In fact, recently new version was released. It’s just quite unpopular (mostly used by universities) because of it’s high price and focus on less commonly simulated phenomena such as optics and electromagnetics. Also, its more advanced solid mechanics capabilities (such as contact) are worse than those of Abaqus or Ansys.
Dear FEAnalyst
Thanks for your reply. Your last sentence means Comsol is not good for solid mechanics and Abaqus or Ansys is better?
Do you have any idea about advantage or disadvantage of Comsol for thermodynamics and Computational Fluid Dynamics projects?
 
It depends what you want to simulate but generally I wouldn't choose Comsol for solid mechanics problems other than very simple cases. Even SolidWorks Simulation can handle them better.
Comsol is also weak in terms of CFD capabilities - mainly because it uses FEM instead of FVM. For CFD there's no better choice than Ansys (Fluent or CFX). But for heat transfer you can uses Abaqus as well as Ansys and other, less advanced programs. Comsol is quite good in thermodynamics too.
 
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