streamline problem
Hey, i am having some problems creating the steamlines for my Helmholtz coil. I followed the steps for the one of the model on comsol website for Helmholtz coil except other than revolve to create the...
View ArticleApplying time derivative as a dirchlet boundary condition
Hi, I need to apply the time derivative of a displacement created in a piezomaterial as the velocity for a fluid boundary..... Could someone please let me know as to how this can be handled in...
View ArticleCurrent not flowing across boundaries
I'm new to COMSOL and having some trouble getting current to flow across material boundaries in my model using the Joule Heating physics. I have a semiconductor wire with metal contacts on each end and...
View Articlewireless power transfer by pcb coil
Dear All, I want to model and simulate a wireless power transfer module. Its application is in microchip implant. The model has two 3D microstrip(PCB with substrate) coil. One for transmitter and the...
View ArticleThe ouput voltage of piezoelectric with displacement
Hello All, I am new with comsol software, now I am trying to solve the basic problem with piezoelectric device. I try to set 'electric potential ' with voltage value as 0, and set 'boundary load' to...
View ArticleAir dehumidification via liquid desiccant
Hi I want to built a model to simulate air dehumidification via liquid desiccant. In this model wet air is blown toward a tube that desiccant liquid is flowed in it. The tube is made of membrane that...
View ArticleWhat is convergence?
I'd just like to know what convergence is - in the context of COMSOL.
View ArticleJava Runtime Environment error
Getting following error, A fatal error has been detected by the Java Runtime Environment: # # SIGSEGV (0xb) at pc=0x0000003da3efbc6c, pid=6909, tid=46912497239488 # # JRE version: 6.0_20-b02 # Java VM:...
View ArticleMultiple-size particle tracing
Hello everyone I have a short question on the particle tracing module. Does anyone know that whether it is possible to simulat particles of different sizes in the same model. How to implement this...
View ArticleCOMSOL License Error -15, 570
Dear COMSOL team, We purchased a 64 bit COMSOL 4.3 verson of software along with a server license. After installing the software on a Linux (Debian 6 Squeeze) based system. We are encountring the...
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 ArticleVibrating horizontal plate.
Good Evening everyone, I have a really simple question, I'm sure someone knows the answer to my problem. I'm trying to make a model of a plate, platform, anything you want to call it, that vibrates...
View Articleerror in statonary analysis of a biased resonator
Dear comsol community, I'm working on comsol4.2a , I would be glad if i can get a solution for my following two queries: 1) I have gone through the modelling instructions given in the 'Stationary...
View ArticleRunning FSI examples, "undefined value found"
Hi!, i am trying to run an fluid-structure example with use of the MEMS module, byt anytime i get the error "undefined value found..." for the variable mod1.v_solid. So i even downloaded the 2d fsi...
View ArticleHow to apply polarized E-field?
My question is simply "how to apply polarized E-field to z-axis?" I mean the incident wave should be polarized Ex or Ey. p.s how can i fix below problem? Failed to find a solution. Singular matrix. For...
View Articlehyperelastic material in contact with a rigid material
I'm trying to model the stresses in a hyperelastic material as it's removed from a highly rigid material (which is acting as a mold). I've set up a time-dependent model with the two materials, a...
View Articlehelix with rectangular cross section 2
Hi, I was following the thread re: helix with rectangular cross section and downloaded the file helix.mph. By fudging the parametric values, I almost get what I need except the the major radius appears...
View ArticleFailed to find a solution for the initial parameter. Multigrid canceled....
Hello everyone, I'm having a problem in my simulation, where it does not converge and return me this menssage when I cancel the simulation."Failed to find a solution for the initial parameter....
View Articleconnecting solid and beam elements.
Hi, how can I use the beam element to act as a shear connector between two solid elements.
View ArticleEquation Based Modeling in structure mechanics
Hi All, While solving equation based structure mechanics problem i encountered the following error message- - Undefined value found. - Detail: Undefined value found in the stiffness matrix. -There are...
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