Geometry variation within Time-Dependent solving.
Hello, I was wondering if it's possible to change geometry according to time ( via internal or external function(MatLab)) ? ie: Making a block depth function of time.
View ArticleElectromagnetic Periodic Boundary Condition
Hi all, I am trying to simulate a 2D periodic electromagnetic structure using periodic boundary condition in comsol multiphysics. the whole structure is 3D but it has 2D periodicity in x and y...
View Articleuse modulo for periodic step function
Hi! I want to create a periodic step function to control the input concentration of a contaminant in an aquifer. I want the concentration to be 1 for 3 months and 0 for the rest 9 months. I have...
View ArticleDiscretization schemes, micromixer tutorial
Dear Comsol users, I kindly ask you to help me with the following task. I have to specify the discretization schemes employed in my model. Since I used an existing tutorial model 'micromixer.mphbin'...
View ArticleMoving ferromagnetic objects inside magnetic field
Dear COMSOL experts, for our research we would need to simulate moving metallic leaves of finite extent inside a magnetic field generated by multiple coils carrying a DC current (i.e. no changing...
View ArticleAverage Nusset number and Standard Deviation Calculation
Please help me How to calculate Average Nusselt number over the heated wall and standard deviation of the temperature over the whole surface at different Ra values in COMSOL? (I am cosidering a square...
View ArticleHeat Generation From Impact
I am attempting to model the heat generated from the impact of two metallic spheres. I was able to solve the structural mechanics portion of the problem, but I am having trouble coupling the heat...
View ArticleElectric Currents Boundary Conditions Question
Hello, I am a relatively new user of Comsol, and I am trying to learn to use the electric currents Physics module. I want to model two copper cylinders with a contact resistance, and 1V applied across...
View ArticleExtremely thin geometries
I created a cylinder with radius 1e-6 m and thickness 9e-10 m in 3D to make a continuum simulation of graphene. I have initial radial stress, an uniform body load along the thickness of the cylinder...
View ArticleWhat's Axial symmetry 1?
Hi, everyone I think people using 2D axisymmetry mode know the default Axial symmetry 1 condition. I feel this condition strange, as most of time there's no variable, no weak expression or no...
View ArticleToday is the *Hotel Savings Deadline* for the COMSOL Conference
Hello, The COMSOL Conference is right around the corner. The Boston Marriott Newton is providing guests of the Conference a special discounted room rate for the event. The deadline is today, Tuesday,...
View ArticleCumulative sum ???
Is it possible to achieve (within comsol) a cumulative sum of a time varying data. Here I'm interested in the calculation of the cumulate mass of water going through a porous media. It is quite easy to...
View ArticleIntegral Constraint
Hey there, I want to impliment an integral constraint: the subdomain integral of one variable (say A) shall be constant. In the COMSOL guide on page 274 it is told to define the integration coupling...
View ArticleVisualization problems
The java heap space problem is solved, but now the simulation reaches 100% of the linear solver and nothing happens, Comsol uses a core of four available cores, I give same time that Comsol takes to...
View ArticleDifferent results with parametric sweep in induction heating model
Hi all, I'm using COMSOL 4.0a to model a 2D axisymmetric model of an induction heater. The real device runs at 62kHz, and when I run a Frequency-Transient study at that frequency for 60 seconds, I get...
View Articlecompressible flow with heat transfer
I am attempting to model hydrogen flowing through a heat exchanger at high speeds and temps (250m/s and 200K). In order to do this, the change in density of the hydrogen must be taken into account as...
View Articleusing function
Hi, I have some data like bellow and I want to use the fitting curve through this data as a function. I have tried the interpolation function but this error appeared >> interpolation grid axis...
View ArticleSolid Vibration
Hi, I'm a bit new on this and I really don`t know if what I'm trying to do is possible. I have a solid in wich there are two membranes in the middle, the objective of this part is that by a vibration...
View ArticleHow to calculate a value between two points?
Hello, I have modelled a simple 2D electric potential plot of a dielectric between two plates with a void in the middle. I want to know the voltage between across the void. I can get the plots on...
View ArticleThermoelectric Model
Dear All, I am looking to find and study example models relating to thermoelectric effect modeling using COMSOL. Does anyone have any reference source/model on thermoelectrics which could be used ?...
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