Can I use COMSOL to solve integral equations?
Dear all, I have some integral equation to solve. Can I do that with COMSOL or I always need to change it to PDE? Thanks a lot!
View ArticleCapillary filling changing area
Dear all, I have been working on a simple 2-phase flow through a capillary. The next step in my model is for the fluid (water) to leave the capillary to a duct with a higher surface area. The model...
View ArticleQuestion on objective function for 'horn_shape_optimization' for own design
So I understand the objective function is: -10*log10(0.5*realdot(pm,pm)/2e-5^2) which makes sense when reading literature but when looking at the definition of 'pm':...
View ArticleEnforcing variables to be greater than or equal to zero
Hello, I'm modelling diffusion through a porous medium with adsorption. The main dependent variable for mass concentration tends to go below zero which is not true in reality. Is there a way to enforce...
View ArticleHelp me please! how to draw the magnetic field lines in 3D, as
Hi all! I need to add the magnetic field lines (and possibly add metal bars between the head and emitter) to the model 2190 Absorbed Radiation (SAR) in the Human Brain. PS Since I'm a beginner, then I...
View ArticleTemperature mapping with Model Coupling
I wish to generate temperatures in a model and subsequently map the temperatures them to a similar model in a different study. The two models will have the same geometry. However, the model will be...
View Articlehow to couple two time dependent physics equation?
in a time step the result from the first equation is use to the second equation ? and then the next step the result of second equation is used to the first equation. for example :...
View ArticleMeshing of multilayered Hemispherical 3-D geometry and Time dependant heat...
Hello Sir, I am trying to simulate a 3D tissue model, which is hemispherical in shape. I am imposing a sinusoidal heat flux on the top curved surface of hemisphere. After solving the transient bio heat...
View Articlemodeling sessile droplet evaporation
Dear Firends, does any one has experience with modeling phase change from liquid to gas ? is there exists any tutorial ? I intended to model evaporation of single droplet pinned of relatively hot...
View ArticleAnimation Scale Factor
I'm trying to create an animation of my simulation. Every time I create it (under Report > Animation), the scale factor is reactivated to some arbitrary value EVEN if I deselect it or specifically...
View ArticleHeat transfer simulation result is much larger than experimental result
I modelled the heat transfer through a hollow brick to calculate the equivalent thermal conductivity. So general heat transfer and weakly compressible Navier-Stokes modules were taken to build the...
View ArticleMagnetic field
Does anybody know how to write this expression on comsol ( ∇/B/^2 )? I meant expression that replace "the gradient of the magnetic field norm square". Thank you
View ArticleStructure with 2D and a 1D truss...
Hello all, I am trying to implement this (see attachment). I guess it should be relatively easy, and for sure lots of people know how to do it :). After "spending" quite a lot of time, I decide to...
View Article2D Power Density
Good Afternoon, I am having some trouble calculating what my power density should be in my 2-D model. I am modeling a cross sectional cut of a heated aluminum plate in air. In my experimental runs, the...
View Articletumor ablation model
hello, i am trying to make a model like" tumor ablation" model in comsol Heat Transfer Module but i want to change the current from DC to AC current and i want to plot the electric field distribution,...
View ArticleHow to write Nabla function in comsol 3.4
Hello, Can anyone tell me how to write nabla function in comsol 3.4? What is the syntax for this function? I wanna use it for dielectrophoresis and there is a term where I need to find the gradient of...
View ArticleDefining a Piecewise function of two variables
Hello, I am trying to model NMR diffusion in COMSOL 4.3 and need to define a function beta at three different time intervals as follows: beta = gyro*(g*x) (0 < t < 0.016s) beta = 0 (0.016s < t...
View ArticleHow to generate a "Join Data" set from parametric steps?
How to generate a "Join Data" set from two stationary and parametric steps? Hello everybody. Does anyone know how to merge two solutions when one of them is the continuation of the other? For instance,...
View ArticleSimulation of the magnetic fied
Hi, I have one physical NdFeB magnet and I need to simulate this magnet in Comsol 4.2a, but I dont know exactly how to do it. I know these parameters of the magnet: Remanence Br = 1380 mT Coercivity...
View ArticlePlease help me find how to achieve this function.
It seems to be a simple problem but I can't figure out how to make it. Description: a 2d transient model of a square is built, the left, bottom, and right side is thermal insulation and the top side is...
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