The 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 ArticleRF MEMS swich
HI all, I am new to this software tool.I need some practice on RF MEMS. so if any one have example on RF MEMS switch, please attach here or send to my mail id billalaxman@aol.com
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 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 ArticleExtruding a hexagon polygon
I want build a prism with a hexagon cross section but am having some issues. I have drawn a hexagon polygon and tried to extrude this but it doesn't seem to be working. Any suggestions would be greatly...
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 ArticleEigenfrequency Problem
Good evening, I'd like to know if there's a way to find the highest, maximum , eigerfrequency of a structure using COMSOL.
View Articlechanging boundary cond. with time
Hello, I want to ask for advice how to change boundary condition in time. E.g. I have exact temperature on boundary for 3600 sec. and after this time, I want to change this boundary to insulation. I've...
View ArticleProblem with meshing in a microfluidic channel.
Hey all, I am trying to simulate the deflection of a half-sphere, with ALE Fluid-structure interaction, stuck on the bottom surface of a microfluidic channel (height = 50 um and width = 300 um) and it...
View ArticleError: 7161 The mass matrix is zero - resolve
Respected sir/ma'am, I am trying to simulate a Nano ElectroMechanical Switch(NEMS) using the following modules:a)solid, stress-strain, b) Moving Mesh, and c)Electrostatics. When i run the solver, it...
View Articlefailed to evaluate variables
Hi , I am building a 3d model of fluid flowing around a wafer using 4.3a. The following error occured when I tried to plot the pressure on the edge of the wafer. Cannot ecaluate expression. Failed to...
View Articledifferent physics with different meshes in 3D
Hello, I work on a casting model with a phase change in a metallurgy process. The 2D-axy model works fine and i begin the 3D model. I work on a 3D coupled problem with different physics: mf for...
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