problem with 2d force calculation in rf module
hi, i am a neophyte.. i am trying to simulate the force on a dielectric particle by Maxwell stress tensor method.. but i stuck at the very beginning.. The problem is that I have to define an electric...
View ArticleModify a surface
Hi I have just started to use COMSOL. I want to modify my surface of rectangle. I could import text file to interpolate data points. But how could I replace one of the edges by the interpolated line?...
View Articlemagnetic and electric field between two plates, with RF frequency
Dear Sir/Madam, I searched through forum and cannot find the answer to my question. I am trying to simulate electric and magnetic field between two copper parallel plates (2D axial symmetry)....
View Articlestrain dependence of relative permittivity in semiconductors
Hi, I've used the structural mechanics module for quite some time to calculate the strain state of Germanium nanostructures on Silicon substrates. A new task now is to calculate the capacity of such a...
View ArticleDC discharge dc.de_4
Hi, I am starting to use the plasma module and I am currently having a look at the DC discharge example (www.comsol.com/showroom/documentation/model/8640/). During the model set up the value of the...
View Articlescattering nanoparticle cross section
Hello Sorry my English is not perfect. I have to make a simulation of a gold nanoparticle (R = 20nm) hit by a plane wave. I have to get a chart: x-axis - wavelength (200nm-800nm​​) or frequency y-axis...
View ArticleCreate geometry from a matrix
Hi everyone, I am trying to create a geometry with Comsol 4.3 with Matlab 2012. The geometry I want to create is very complex. The geometry is defined by a matrix (the value 1 corresponding to the...
View ArticlePossible to export the streamline coordinates?
Hi, I am only using the laminar flow conditions, I have plotted the streamline after the simulation, is there anyway to get the streamline coordinate from the simulation? I like to export it if it is...
View ArticleLivelink for Matlab material definition issue
Hello, My problem is the following: I am defining a RF model: [...] model.physics().create('rfw1', 'ElectromagneticWaves', 'geom1'); model.study().create('study1'); s1 = model.study('study1');...
View ArticleCreep - Plasticity
I want to use the non-linear structural mechanics module for simulation of plastic deformation by yielding. There is a creep module and a plasticity module. In the creep module, I find more suitable...
View Articlehow to assign conductivity to fluid flow in a microchannel preconcentration...
I am modeling a solution phase preconcentration in microchannel. My system has two inlets and one outlet. From inlet1, buffer (10mM) containing a negatively charged dye is supplied and from inlet2 same...
View Articlemagnetic concentrator
Hello, I work on a cold crucible for the fusion of silicon with a coil around (around 10 kHz). I have done a 3D model of the crucible to know the efficiency of the crucible (how power is transmetted to...
View Articlesoil plasticity in poroelasticity
I am doing a project using poroelasticity interface, but I wan to consider plasticity behavior of porous materials, so I need to use plasticity constitutive model for porous materials. How do I add...
View ArticleComsol 4.3 with Matlab - ACDC Rotating machinery - Identity Pair
Hi Comsol forum, this is the very first time I open a new thread. I want to share (and I hope to solve) the problem which is afflicting me when I try to run a time dependent problem using Matlab 2012....
View ArticleTemperature profile can't be shown
Hi Im Farah. Now im dealing with simulation for a biomass-gas stove and im focus on mixing between pyrolysis gas and air. But i have a problem with the energy balance. In this model, i have 4...
View ArticleAdding a foce to a certain limited region of a surface of the solid
Hello everyone, I have a beam , and the force is acting on the top surface of the beam , but only in a certain region. Hence, I should not select the entire top surface as the surface acting for the...
View ArticleRotation in comsol
I have a query reading thermal simulation in comsol. I want to incorporate rotational motion into thermal simulation and analyze its effect. I was able to run the thermal simulation, however when I...
View ArticleUser defined port equivalent of coaxial port
Hi all How can I model coaxial port using USER DEFINED port type in stead of directly using COAXIAL port type. Thanks in advance.
View ArticlePlot 3d result only in specific area
Hi everyone, Is it possible to plot a 3d surface data only in specific designated area? I have a 3d temperature data that has a rectangular shape and I want to plot only the upper-right area of that...
View ArticleWARNING: The relative residual is greater than the relative tolerance.
Dear all, I am doing an eigenfrequency analysis of a free thin layer (0.5x21cm) using the Structural Mechanics Module 4.0. I am working in the physics of solid volume with a very fine mesh (maximum...
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