Fluid in "swirling" motion
Hello,I am fairly new to comsol, and to start out in the fluid-simulations and fluid-structure-interaction I wanted to model the "swirling" motion of a fluid inside a circularly agitated vessel.I...
View ArticleWeak form of Naveir Stokes equations in COMSOL.
If a physical model is not listed in the wizard, we can use Comsol's weak form to enter PDE's (governing equations of a system) in their weak form. How can it be done ?for example: 2 equations of...
View ArticleConvergence issue when using a small constant (May have reached a singularity)
Hello I am solving a 2D transient Poisson and Nernst-Planck equations on two domains. The initial conditions are different in two domains. In the Poisson equations (There are 2 Poisson equations), on...
View ArticleWhat does Coordinate "System from Geometry" mean for a ellipsoid?
Hello everyone, I found several coordinate system variations. One of those is System from Geometry. What does that mean in case of selecting an ellipsoid randomly rotated in the room with this kind of...
View ArticleHow to take into consideration shear waves
Hello, Please help me.In acoustics module, how do we specify that specific domains are solid. In order to take into consideration the shear waves. I am using pressure acoustics, frequency domain...
View ArticleGas flow into chamber
Hi,I am new in using comsol. I am working on gas sensor application. I want to simulate the gas flow into the gas chamber to check the diffusion of gas inside the chamber. I read this paper entitled...
View ArticleEquality constraints in optimization
Hi,I have to minimize the volume of a heat transfer enhancement having geometrical parameters l1, l2 and h2I have to furnish the following equality constraint in my...
View ArticleKinetics of heating a plastic wire in a furnace (beginner)
Good afternoon,I ask for your help to solve a relatively simple problem on COMSOL Multiphysics. Indeed, I would like to study the kinetics of heating a plastic wire in a furnace (without any phase...
View ArticleShell and tube heat exchanger simulation problem
Dear all,I'm simulating a heat exchanger with some of the tubes plugged within it.I have 19 tubes within the heat exchanger.When I 18 of 19 tubes, at different locations, I get the simulation done, But...
View ArticleElectrostatic Conditions
For an electrostatic problem, - what is the default boundary condition? - what is the appropriate symmetry condition and how can that condition be assigned?Thank you very much for any information.
View ArticleHeat transfer post processing
Hello, I have the following problem:after solving a comparably simple heat transfer problem I want to evaluate the temperature distribution in a domain in such a way that I want to know the temperature...
View ArticleProblem to setup an simulation case
Problem to setup an simulation caseHi there, I'm new to use this simulation software. I tried to simulate a rotating magnet which create another maganetic field among the balls in a bearing. Those...
View ArticleCan Comsol simulate unsaturated soil behaviour under cyclic traffic load?
For example using Barcelona Basic Model for the unsaturated behaviour simulation. Thank you.
View ArticleEHD Cone Jet
The below post is related to an archived discussionHi,Did you get any reasonable results for the EHD-cone jet simulation. If so, can you share the procedure?Regards, Tawsif
View ArticleUvsI Coil and Required Resistor in Parallel in Electric Circuit Node
Hello COMSOL team and users:I am using an AC current source to excite a UvsI coil in the Electric Circuit node and I see that I have to connect a resistor in parallel with the current source and with...
View ArticleBall-screw
Hi everyone,Is anybody here know how can i model a ball-screw with nut?Thanks
View ArticleCO2 injection
Hi everyone,I am currently doing my final year research project on ‘A modelling study of petro physical properties changing during CO2 injection into carbonate reservoirs’. In my first part of the...
View ArticleQuestions regarding defining a geometry with variables
I recently have met a question when using COMSOL to simulate the deformation of an elastomer membrane. The elastomer membrane I am using is not a flat membrane but has a inhomogeneous surface profile....
View ArticleElectric field parallel to electron current density
Hi,I am trying to make an electro-thermal GaN-HEMT device model on Comsol using the Semiconductor and Heat Transfer modules.I have tried to incorporate the Caughey-Thomas mobility model to evaluate...
View ArticleExtract point values from line and reference them in expressions
Hi, it feels like a very simple question that I have, but I cannot figure out how to do it.Let's say I have a plate that is heated on one side, so a temperature profile is developing across the plate....
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