Questions of the modelling of a light bulb using Heat Transfer Module
Dear all: Now I am trying to carry out some simulations using heat transfer module. To start with, I downloaded the "free convection in a light bulb" model, which can be obtained from:...
View ArticlePropagation loss in SAW devices
Hello! I use Comsol for SAW device simulations and design some time domain models for SAW delay line. Results (impulse responses) are rather good. Now I want to introduce propagation losses in my...
View Articleparticle size and geometric constraint of channel
Hi, I designed a microfluidic channel with gaps at 10 um. Of course, particles with diameter at 1 um can go through this gap, but particles with diameter of 15 um still can go through this gap, which...
View ArticleClassic PDE Helmholtz Equation
I am trying to use the 3D Classic PDE for Helmholtz Equation for diffusion through a cylinder. I have not used Comsol much before, and I am a little confused on the Sub-domain/boundary conditions. The...
View Articleerror message when define interpolating function in matlab (other function...
Hello everybody, whenever I define an interpolation function in matlab with model.func.create('int1', 'Interpolation'); I get an error message (see below) - but if I write instead...
View ArticleMAKING STRIATIONS IN A SOLID CYLINDER
how do i make striations in a solid cylinder? I know it should be possible but some how cannot figure out how?
View Articleimport a bmp image into COMSOL geometry
Hey, as stated in this webpage: www.comsol.com/products/formats/ Comsol can both read and write few types of images. However, when I tried to import a bmp image as my structure for flow simulation, it...
View ArticleMie scattering in 4.3
Hello, I have already seen some discussion about mid scattering of a gold nanosphere. But I the discussions I have consulted, no one has yet implemented a mie scattering program in Comsol 4.2 or 4.3...
View ArticleWhich solver type to use for coupled K-Epsilon and pipe flow model?
I have a heat exchanger model that I am solving with the CFD and pipe flow modules. I am unsure of which type of solver I should use. I have looked at the COMSOL example model 'heat exchanger plate'...
View ArticleTry converting to triangular mesh on these faces
Dear sir, While meshing my model, only one domain didn't get meshed. And the error shown for a face which is not meshed is "Try converting to triangular mesh on these faces". And, I was not able to...
View ArticleUndefined Value Found
I was runing a 2D model and came up with this error.. anyone can help me?? Undefined value found. - Detail: Undefined value found in the equation residual vector. .There are 912 degrees of freedom...
View ArticleRandom nucleation
Dear all, I am currently involved in a phase change simulation. I have not yet found the way to deal with random nucleation occurring for instance during the quenching : during the transient heat...
View ArticleProblem in direction of magnetic field
Dear all , I simulated the Two coil system with ferrite core , with primary coil and secondary coil and both are separated by distance , i have problem that , if i am exciting primary with voltage...
View ArticleCan't save file after deleting one model
I started with one model, then created a second and afterwards deleted the first one completely. Now I am unable to save the file and I also can't run any study. I think there are some variables left...
View ArticleHeaviside function simulate Acoustic emission signal
Hello, I need to apply a Heaviside function difference to simulate a Acoustic emission burst signal. Can help, how can I do this? What model should I use? I'm new working with COMSOL. Thanks, Nuno...
View ArticleVariable heat capacity
Hi! I have measured Cp for metal alloy. It has significant temperature dependence. Is it possible to use Cp(T) instead of constant Cp for transient heat transfer problems? Thanks!
View Articlecomsol35a java3d restricted access exception
hello does anybody have already met an error (9040) with java3d dealing with " restricted access exception" with mac os x ? is it connected with java itself on apple, or with comsol 35a or eventually...
View ArticleModeling a Sliding Constraint
I am trying to model a sliding constraint, basically a pin in a hole. To try to understand how best to apply the contraints I created a simple model of a tube and rod. The tube and rode are both 1 m...
View ArticleModeling a Sliding Constraint
I am trying to model a sliding constraint, basically a pin in a hole. To try to understand how best to apply the contraints I created a simple model of a tube and rod. The tube and rode are both 1 m...
View ArticleStiffness in bending mode
Hello Everyone, I have been COMSOL for quite sometime and have come across a problem that I can not solve very recently. My objective is to find out the bending stiffness of a metallic nanoplate. What...
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