Simulation filament formation Laminar two phase flow (level set)
Dear all, I wonder if someone can help me. I would like to make a simulation using the Laminar two phase flow method (level set) coupled to an electrostatic simulation (ec module). Basically the idea...
View ArticlePDEs expressed in Weak Form Coupled to ODEs
Hello, I am currently using COMSOL 4.3a. I am solving a problem constituted by a set of coupled PDEs (depending on time and space), defined in a domain. To solve this, I used the Weak Form. In...
View ArticleOne way coupling- A reasonable approximation?
In the tutorial for FSI in a network of blood vessels, it has been narrated at the end in the results and discussion section for Figure 5. " The displacements are in the order of 10um, which suggest...
View ArticleWhy conservation of mass is violated in Comsol - Laminar flow?
The model is simple, I use rectangle as my geometry(0.1505m*0.006m) ,and chose laminar flow as my module, then assign inlet boundary condition, which is pressure boundary,10[Pa], outlet condition is...
View ArticleMetal film with subwavelength size hole: Transmmittance and reflectance study
Hi I'm novice in comsol RF simulation. I'm trying to simulate transmittace and reflectance throught metal film with subwavelength size hole. My structure will consists of Air/metal/semiconductor...
View Articlestreamline 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 Articlehow to enter a Channel thickness
Hi everybody, how to enter the Channel thickness? I use the (laminar flow -> mass flow -> mass flow rate -> normal mass flow rate), but get an error! I read a comsol documentation and I think...
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...
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