Run COMSOL @ remote PC -> JAVA error!!!
Hi guys! I'm trying to run COMSOL to simulate myscript.m file, which works perfectly on my PC, in another PC. This is what I did: ssh -X etc etc cd myfolder nohup ./mybash.sh & in mybash.sh I got...
View Articleweak form PDE modeling of 1D Poisson-Nernst-Planck (PNP) equations
Hello: I'm learning the Weak Form PDE modeling in Comsol and I want to solve Poisson-Nernst-Planck (PNP) equations by using Weak Form PDE. Although we can solve PNP by using modules of Poisson's...
View ArticleGeometry Addition With Time-Dependent Solving
Hello, Is it possible to vary one dimension of the geometry in a Time-Dependent problem The process i'm modeling involves injection of material with time and moving heat flux on one its surface along...
View ArticlePoroelastic waves - acoustic module - material definition
Hi, I would like to model a poroelastic material with the acoustic module. However, can you tell me how I can link my parameters to material proporties. My parameters are : - porosity - tortuosity -...
View ArticleCreating a region with a constant gradient field
I want to create a region of air with a static magnetic field in the z direction that has a constant slope (gradient) in that direction as well, for example H(x,y,z)=(0,0,1+z/10). Once I have this, I'm...
View Articlemagnetic field gradient in 3D return zero!
Hi everybody If anybody knows that why the gradient of magnetic field in 3D models is always zero? I checked the different methods. for example I wrote d(Bx,x) or different component of B and H. Even...
View ArticleHow to calculate the area or volume surrounded by contour ？ intop function
Dear All, I have a laser photothermal therapy model in which I coupled the bioheat equation with thermal damage equation (Arrhenius). The model consists of two regions, tumor and the body. The outputs...
View ArticleDC Discharge and Magnetic Field
Hello! I try to get Current-Voltage Characteristic of Inverted Magnetron Vacuum Gauge using COMSOL. (see image here ej.iop.org/images/0963-0252/21.../Full/psst402568f02_online.jpg ) I successfully...
View ArticleWhat about the use of mono or biphasic pulses in AC/DC module?
Hi all I want to see the results of the stimulation of a tissue with biphasic current pulses in 2D. AC/DC module, Electric Circuits (ec) and time dependent study are used. There are 3 different...
View ArticleImporting CAD geometry created with Rhyno
Hi, We create our CAD models using Rhino and the FEA we do it with COMSOL, therefore we have to import the CAD models in COMSOL. The CAD model from Rhino is exported to step or igis format and then...
View ArticleLumped Port S-parameters > 1 w/circuit interface @ port
Good day, This is a problem I have been dealing with for a while. I have a fairly basic setup involving 2 coupled antenna. I have extracted my desired S-parameters from my system in question, and have...
View ArticleMagnetic simulation
Hi, I would need some assistance with a simulation in cosmol using the magnetic module. The problem involves simulating the surface field of a magnetic coating.
View ArticleWhich Current/Voltage Value is used by Coil Excitation in Coil Domain...
Hello, maybe someone can help me to figure out one "little" fundamental problem of understanding. I build a modell of a coil which I would like to excitate with 10 Ampere RMS current. Further more I...
View Articlehelp in choosing a model
Hi, I an trying to model a liquid solution,that contains particles,that enters as a drop(hemisphere) to a pipe full with air. Between the air and the solution there is a surface tension. I am trying to...
View ArticleAir loss into environment boundary condition
If I have a box of porous media and an inlet pressure on the bottom edge, no slip on the right and left edge, what boundary condition would I need to apply on top edge to allow for mass loss into the...
View ArticleFail to evaluate variable. (material.epsilonr13)
Hello, I would like to calculate the electric field within a chamber with gaseous xenon filled out all the space. In the meanwhile, there is another hollow cylinder inside the chamber which is made up...
View ArticleHow to set boundary conditions from parametric solver
hello, We want to successivly run a DC_model by changing only some boundary conditions (i.e. current density on a face) on only some geometric objects (i.e. electrods). We want to use parametric solver...
View ArticleParticle energy distribution
Hey Comsol gurus, I am trying to simulate complex particle distributions in electric and magnetic fields. The mf and es parts are working quite nicely but I am experiencing some difficulties setting up...
View ArticleModal analyses of assembly constructions
Hi, I was making an eigenfrequency analyse of electric motor housing including several rotor and stator parts. Since I am using a solidworks livelink the construction is a bit more complicated yet...
View ArticleGeneralized alpha settings
Hello everyone Can someone indicate me the different settings for the "maximum time step" and "time step increase delay" when choosing the generalized alpha tims solver? For example, I'd like to have a...
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