Bias Current Density
hi!! I need to generate 1.5 Tesla magnetic flux out of a rectangular block. what value of current density (J) should i use? what is the constitutive relation to find the required current density...
View ArticleMeshing errors
I just stated using COMSOL and I'm trying to build two helical coils stacked on top of each other with a ~5cm gap. Whenever I attempt to build the mesh I get the error tree, failed to generate mesh for...
View ArticleWhat kind of strain or stress should I be reading in the results for...
Hi, I am doing a piezoelectric simulation and using a force, I have displaced the piezoelectric cantilever. However, in the results section, I'm not sure which type of strain should I be looking at as...
View Articleadiabatic air compression
Hi, I want to ask what kind of modules I need to realize adiabatic air compression. I am not sure weather I need to define compression heat using ideal gas law or some modules can consider compression...
View ArticleHow to reduce the model file size
Hi, I built a 3D heat transfer, time dependent model. After simulation, the model file goes beyond 5G. Is there anyway I can reduce the file size? I only care how the maximum temperature changes with...
View ArticleCreating and using external Matlab functions
Does anyone have any experience in creating and using external Matlab functions? I am running Comsol 4.0a, and would like to be able to pass parameters to a Matlab function, do some calculations, pass...
View ArticleWeak Boundary on COMSOL 3.5 a COMSOL 4.2a
Hi, I am chemical engineer of the Mexico City. In the work: square_droplet_2Daxi_reset.mph, that this in the comsol version 3.5a, in the tutorial in the step 7: Open the Equation Systyem > Boundary...
View ArticleParametric Sweep and exporting data
Hi, I'm doing a parametric sweep in a model with a geometry that depends on the same parameter wich I sweep. I run my parametric sweep and works well (the solver remeshes the model for each value of my...
View ArticlePlot on of field on plane, RF MODULE
Dear all, I need help. I have model with two spheres (attachment). I want to plot electric field enhancement but in one plane for one wavelength. I know how to plot electric field for many wavelength...
View ArticlePlot on of field on plane, RF MODULE
Dear all, I need help. I have model with two spheres (attachment). I want to plot electric field enhancement but in one plane for one wavelength. I know how to plot electric field for many wavelength...
View ArticleDefine a selection from the solution
Hi, I am solving a two-phase system and I want to know, how can I calculate the time-dependent rise velocity of the bubble (in the file below)? In my case the domain selection is not possible because...
View Articlemodel works with identity pairs but not with contact pairs
Any tips on what I am doing wrong in the attached axisymmetric model involving a titanium part with a rounded top that supports a nylon liner that fits inside a titanium "cap"? An approximate image of...
View ArticleScttering problem using comsol4.2
I wanted to calculate scattering absorption cross section and thereby extinction for a nanoparticle. I am not sure how to go for that in comsol4.2. Can anyone please tell a basic flow to accomplish...
View ArticlePlasmonic Waveguide
Hello every body. I am trying to simulate a simple plasmonic waveguide in "2D Mode Analysis" to calculate "propagation length" but I have confused. because the conducted result (2.6um) is different...
View Articlewhat does the "exclude algebraic" error estimation option do?
I'm working on a time dependent convection-diffusion simulation. The Peclet number is 10^3 to 10^4. The maximum Reynolds number is ~100. The solution tends to diverge at a point where the input...
View Articlea time dependent matlab function
Hi I'm trying to make a time dependent time function to input as a boundary condition in comsol. I have a vector in matlab and each line is applied in a determinated sampling time in the boundary...
View Articlemodeling a torque measurement setup
Dear All, I am modeling a test setup that is used to measure the torque of a rather unconventional electrical machine called the lateral stator machine. You can see this machine in the attached file....
View ArticleHerschel-bulkley
Hi I'm trying to understand how can i define shear stress parameters for Herschel-bulkley model in Comsol 4.2a The stress expression for this model is: stress = yield stress+m*(shear rate)^n Any...
View ArticleBoundary conditions for strain based loading
Hi, I would like to perform a loading on a 2D specimen using Comsol to obtain a stress-strain curve for shape memory alloy (using the Ginzburg-Laundau model). To obtain the stress-strain curve...
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