Troubleshooting Comsol 3.4 Installation and Uninstallation

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Discussion Overview

The discussion revolves around troubleshooting issues related to the installation and uninstallation of COMSOL 3.4, as well as modeling challenges using COMSOL software, particularly in the context of fluid dynamics and heat transfer applications.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant inquires about the possibility of discretizing boundary conditions in the Navier-Stokes equations for modeling purposes.
  • Another participant confirms that different boundary conditions can be applied to different physical boundaries and suggests that this should be done at the drawing stage.
  • A participant mentions modeling biofilm growth influenced by hydrodynamic stress and expresses a preference for using COMSOL 3.3 over COMSOL Multiphysics.
  • Several participants discuss modeling heat transfer between electromagnetic sources and solid materials, with one seeking help to model how an infrared source heats silicon.
  • Another participant notes the lack of available modules for the specific modeling task and references an example from the COMSOL model gallery related to thermal annealing of silicon wafers.
  • A participant reports an installation issue with COMSOL 3.4, specifically an error related to classpath and difficulties with uninstallation, seeking guidance on resolving these issues.
  • There is a request for information on the location of the comsol.opts file needed for uninstallation.

Areas of Agreement / Disagreement

Participants express varying levels of familiarity with COMSOL and its capabilities, and while some agree on the feasibility of applying different boundary conditions, there is no consensus on the specific modeling tasks or installation issues raised. The discussion remains unresolved regarding the installation and uninstallation problems.

Contextual Notes

Participants mention specific versions of COMSOL and their preferences, which may affect the applicability of certain solutions. There are also references to missing information and examples that could aid in modeling tasks.

gganendra
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Hi everybody, newbie here...

im doing a modelling work with comsol and have a problem of solving using navier-stoke equation for the boundary. is it possible to discretize the boundary condition into several parts and apply different condition in each segment?

thank you beforehand,
 
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I have never tried NS but I am familiar with the COMSOL environment.
You can definitely apply different BC to different physical boundaries.
Reading between the lines I take it that you have a smooth boundary that you wish to divide?
This is done at the drawing stage, e.g. if you have a rectangular plane you can divide it using lines.

I'm curious about your reasons for doing this... normally if this was part of your problem specification you would have done this at the beginning.
 
thank you, i am doing modelling of biofilm growth on a rough surface which is influenced by hydrodynamic stress. I am using comsol 3.3 script, it is more comfortable than using comsol multiphysics

thank you
 
Hi everyone... i am new user of COMSOL multiphysics... I have to model the heat transfer between an electromeagnetic wave and solid material... ie i have to get a model to explain homework an em wave is used to heat up a material...can anyone help me in doing this...
 
Please describe the experimental setup completely.
 
Hi gokul...actually i want to model the energy coupling between a electromagnetic source and solid material...
 
that is , i have to model how a solid material is heated using any em source...for instance any infra red source (any light bulb) is used to heat a material say Silicon... how can i model the heat transfer from the bulb to silicon and then i have to plot the temperature variation vs time...
i tried heating the material with a heating element specified in comsol library and tat seems working...but nw i have to replace tat solid heating element by a electromagnetic source...
can u pls help me
 
I'll have to look. I don't recall seeing a module that can do this, but I may be wrong.
 
@ gokul...ya even i didnt see any model to do this...but if you go to comsol.com website and see for the heat transfer models in the model gallery there is an example which they have mentioned...its about thermal annealing of silicon waffer using indirect IR lamp...but unfortunately we don't have access for any further info on that...
so i think it is possible to do model my problem...but i have no idea homework to do...is it in PDE application mode?
pls reply if u find out any info on my model...
 
  • #10
Hello everybody
I have a problem with Comsol 3.4 installation, it doesn't run after the installation is finished.
I get the following COMSOL Error: "No class com/femlab/gui/Femlab on classpath."
I've tried to uninstall but also unsuccessful, I get the message:"EXIT FAILURE: Failed to load uninstallation components." and "Can't find comsol.opts file".
The question is whether there is a solution to uninstall the program and where the comsol.opts file has to be placed so it could be found during the uninstallation (I have the file but I don't know the directory where it should be placed)

I'll appreciate your help.
 
Last edited:

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