out of memory during LU factorization ?
I use comsol multiphysics 4.2 to solve a model on my computer(with 2GB RAM), I get the error "out of memory during LU factorization", but when I put the same model into another computer(the same cpu,...
View Articlecontact modeling and time dependent analysis
Hello all, I am trying to model a time-dependent vibration problem (resonant vibration) with contact and I am having trouble solving the model. The contact is between the shaker and the object. I want...
View ArticleQuestion about Nernst-Planck Model
Hello, I'm a new user for Comsol 4.2. When I applying the Nernst-Planck model form my work, I added 5 species, c1,c2,c3,c4,c5 which zc1=+1, zc2=-1, zc3=-3, zc4=+1, zc5=+1 and set the 'from...
View Articlecharged particle deposition
Hi all, i'm trying to model (3D) an electrodeposition of nanoparticles under laminar conditions (fluid flow), but i've no idea....which module i should use. I'm using the comsol version 4.2a. any idea...
View Articlepartical tracing never works
hi i cant get particle tracing to work help pls. i have a simple 2d example with a rectangular with an electric field on it. the particle tracing modul doesnt show any interaction between the particles...
View ArticleScttering problem using comsol4.2
I wanted to calculate scattering absorption cross section and thereby extinction for a nanoparticle. I am not sure how to go for that in comsol4.2. Can anyone please tell a basic flow to accomplish...
View Articlethe free vibration of the cantilever
Hi everyone: The initial displacement D=1.05mm, is placed on the end of the cantilever beam, to solve the velocity response of the beam end. First, I select space dimension 2D, and add physics Beam,...
View Article2D coplanar waveguide Port Modeling
Hello everyone, I have a very simple 2 D model of the crossection of a coplanar waveguide (substrate in an air box, at the boundary between substrate and air I have lines for the metallization). I want...
View ArticleWeak Form Modeling and Multiphysics Coupling in RF Module
Hello All, I have some problems when using user-defined weak form PDEs and multiphysics coupling for 3D nano particles scattering in the RF module. Please find the attachment for the detailed...
View ArticleInternal error in geometry decompositon: problem with just 2 elements in model!
Hi Everyone: I am trying to build a complicated 3-D model with many channels and such but I ran into a problem very early on. I just have one block attached to one hexaheadron. I am unable to form a...
View ArticleFrom PDE to linear algebraic equations. Algorithm of solver
Dear Sirs, please advise me with my deal. I simulated a model in ACDC->Electric currents. As I can see there are some differential equations which FEM approximates into a system of nonlinear or...
View Articlemphgetu
Hi all. I am using Comsol with Matlab (version 4.0) for a time-dependent analysis. I have to process many data (there can be 1000000 degrees of freedom). It takes a lot of time to save these data and...
View ArticlePML v4.0
Hi all. I would like to use the PML for a time-dependent analysis in the Structural Mechanics Module (version 4.0), but it doesn't look to work well. Can you help me to implement the PML in my model?...
View ArticleSimulation of a wireless power system
Hi, I am trying to simulate a wireless power system between two coils. The transmitting coil is connected parallel to a electric circuit consisting of a capacitor and a voltage source in parallel. I...
View Articlehow to model capacitive RF MEMS shunt switches
Halo..i need who can help me to model the capacitive RF MEMS shunt switches. i'm still new doing simulation by COMSOL 4.3
View ArticleProblem with CPT
Hello. Every time I put into the model Charged particle tracing CPT. Everything works normally, but can not create any output with CPT. Thank.
View ArticleParticle Tracing Module
I am using COMSOL 4.3a and I am having trouble with the particle tracing module. I have built a geometry in which I solve for the Electric potential. I now want to apply a Dielectrophoretic force on...
View ArticleMoving top hat heat source
Hello, I'm trying to create a moving heat source with the energy profile of a top hat. So far I was able to move a circular heat source with a 'waveform' function. But I only managed to create a...
View Article3D waveguide, compute electromagnetic field
I want to view the electromagnetic field (in particular the norm of E) of 3D waveguide. I haven't experience in a 3D waveguide, I have simulate always a cross-section of waveguide. First of all I...
View ArticleQuestion about example- "Plasmonic wire grating"
Dear all: I have a question about the example "Plasmonic wire grating". In this model, I saw that the Floquet boundary condition applied at the left and right boundary is that kF=kax (wave vector),...
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