How do I load arbitrary current to the coil in comsol?
In comsol, I want to give the coil arbitrary current defined by interpolation, but it always wrong. My specific approach is: (a) the global definition, using interpolation method defined excitation...
View ArticleNatural convection in heat transfer
I am solving natural convection problem for 5hrs in which first problem start with conduction and finish with natural convection effects for solid liquid interface location. During first 1 and 2hrs the...
View ArticleHow to cause calculated strains from PDE for constitutive model
Hi everybody! I have a quick question for you about implementation own constitutive model. So my model describe shotcrete behaviour and it’s composed from several parts responsible for shrinkage,...
View ArticleParametric Sweep without saving results
Hi all I am running several models in v4.2, and with all of them I need to sweep at least two if not 3 or 4 nested parameters (which works just fine!). I have done this using both the internal and...
View ArticlePhotocurrent calculation in RF module
Greetings I have a solar cell (silicon brick) with metallic rods on the top surface. This is well known structure to enhance the solar cell responsivity with plasmonic effects. So I want to calculate a...
View Articlehelp
can anyone please tell me how to slice a 3d object in comsol. i have designed a spring. now i want to flatten its top by slicing it. please help emailshubho@gmail.com
View ArticleCoupling Surface-to-Surface Radiation and Rad. in Participating Media
Hello, My problem contains both radiation types: a glass-like solid cylinder with an absorption coefficient is surrounded by a transparent noble gas within an cylindrical enclosure that has a known...
View Articlewhy the data exported as txt format in the notepad does not line feed...
hi Just as showed in the attached.The data is so mess that i can not distinguish which one I need? Did any other people met the same problem? can you give me some suggestion ? Thank you in advance.
View ArticleElement killing during laser melting
Dear friends I am working on laser cutting with moving heat source with subsequent stress analysis. I have successfully simulated the thermal analysis . However, I dont know how to delete/kill those...
View ArticleNeed to surface plot first stress invariant
Version comsol: 3.4 I was wondering if there was a way to input an expression for first stress invariant (or any other stress state) to Comsol 3.4 and surface plot the results. thx
View ArticleRadial Stress
Hello, I obtain stresses around a circle in x and y directions. I was wondering how it is possible to have the stresses in radial coordinate system rather than Cartesian system. I mean plotting radial...
View ArticleError "Attempt to evaluate negative power of zero"
The error is as follows: Attempt to evaluate negative power of zero. - Function: ^ Failed to evaluate expression. - Expression:...
View ArticleNew user - Electrodes and neuron models
Hi everyone. I am a very new user of COMSOL, and I have a few basic questions about the modelling I want to do. I am trying to model a region of the brain (that is, a collection of neurons), and how it...
View ArticleHow to loop simulations in Comsol 4.2a with Matlab
Dear comsolers, here is an example on how to loop simulations. I'll let you decode it. 'Preprocessing' that I did before the loop: 1. Build a model in Comsol (attached). 2. Save As Model M-File...
View ArticleEffect of temperature on SAW devices
Hi, I'm trying to simulate the effect of temperature on Surface Acoustic Waves (SAW) devices . I'm using the module "Piezoelectric devices" and so I get the response of the admittance in a certain...
View ArticleFinal Abstract Submission Deadline for COMSOL Conference 2013 Boston - 2...
Dear COMSOL Users, The Final Abstract Submission deadline for the COMSOL Conference 2013 Boston is only two weeks from today, Friday August 2nd! Show the modeling and simulation community what you are...
View ArticleNormalize field by value of the same field
Hi there, what I'm trying to do is to divide the normE field that comes from a double parametric sweep solution by a (local) maximum of the same field, at best without exporting the data. It's a 2D...
View ArticleInserting Force into Comsol
Hi, My model is a simple hollow cylinder and i'm trying to apply forces on the inner surface of this model. Forces are in the form of a 12000-by-48 double array. Which 12000 is time steps and 48 is the...
View ArticleConvection-diffusion equation and/or advection equation: incorrect solutions
Hi, I have been working with the convection-diffusion module of the COMSOL Multiphysics module (version 4.3a). I want to study how a charge density (a cloud of electrons) drifts horizontally and...
View Articlesimulation of deformation after removing fixed constraints
Dear all, I want to simulation the final deformation of a plate after removal of its bottom fixed contraint I have a solid plate with its bottom fixed to the ground. Its temperature changes from 70...
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