How to calculate Extinction efficiency in comsol35a?
Dear Users, I am new to comsol. I have tried the example of a gold nanosphere in RF module. I have obtained directly the scattering cross section, extinction cross section and absorption cross section...
View ArticleConversion: Comsol mesh to Comsol geometry
I have a question concerning the possibility to convert Comsol mesh to Comsol geometry. For instance, I have a Nastran surface mesh which has been imported into Comsol mesh but I would like to use this...
View ArticleProblems while using Interpolation function
Dear colleagues, I am trying to use the data output from a Matlab program as a source in my coefficient form PDE using the interpolation function. The data is being distorted by the interpolation...
View ArticleSolving Self - Consistent Schrodinger and Poisson with MATLAB and COMSOL...
I'm a COMSOL 4.2a user. I need to solve 2D self-consistent Schrodinger and Poisson equation. Thus, I need to feed the potential values and the wavefunctions to the Schrodinger and Poisson equations as...
View ArticleIdentifying the eigenfrequencies of a shell sphere
Hello, I am new to Comsol and I was asked to identify the eigenfrequencies of a hollow sphere of 100um diam. and about 3 um thickness. I started by using 2d axisymmetric analysis->solid mechanics...
View ArticleTime Space dependent Interpolation function
Hello! I want to use a velocity boundary solution u(x, t) from one physics in another physics. The timesteps, the mesh and the geometry are equal. I use the Laminar Two Phase Flow, level Set physics in...
View ArticleDefine a Mixed (cauthy) boundary condition for Richards Equation(subsurface...
I read some paper, in the old version of COMSOL, we can choose a Mixed boundary condition (mix of Dirichlet, Newman and Cauchy conditions). in order to automatically transfer the boundary condition...
View ArticleConjugate heat transfer pipe flow
Hello, I am trying to simulate a very simple laminar flow inside a pipe problem with a constant temperature at the walls. I have a cylinder made of water(liquid), and where one part is kept at a...
View ArticleInstallation problems on Ubuntu 11.04: Failed to load libjvm.so
Hi, I have problems installing COMSOL 4.2a under Linux. I mounted the .iso file as indicated, but when i run setup, i get the following error message: Failed to load the JNI shared library...
View ArticleHow to display current density in thin metallic layer difined by transition...
Hi to all, I'm working with the RF module to simulate response of metamaterial which consists of split ring resonator (SRR). The SRR is made of thin metallic layer. To model the layer within Comsol I'm...
View ArticleNatural Free Convection
Hello, I'm attempting to model the temperature rise above ambient over the period of one day within a sealed concrete trough buried in soil with its top exposed to outside air. I have successfully...
View ArticleFinding the location of the maximum of a variable
Dear Comsol Community, I am looking for a way to find the location of the maximum of a variable. Getting the maximum value is easy, but so far I have not been able to get the coordinates of the...
View ArticleProblem: Oil Droplets Seem To Dissolve In Water (Two-Phase Flow, Level Set)
I have a problem with my "Two-Phase Flow, Level Set" simulation in COMSOL 4.2. I am trying to simulate the formation of oil droplets in water by hydrodynamic flow focusing. The water and oil are...
View Articlecan extract such kind of coordinations to build the model?
Hi, everyone, I’m building a heat transfer model, so the dependent variable is the temperature T. During the model, I want to obtain the location or coordination (x,y) where the temperature is equal to...
View Articlenon uniform heat flux
Hello all, I'm trying to model simple 2D conduction model in a slab. What I want to do is use a non-uniform heat flux for a boundary condition. I already have the heat transfer coefficient distribution...
View ArticleProblem about Joule heating and thermal expansion
Hi I want to inject ac current (amplitude is fixed) to a silicon beam and hope to see maximum expansion when the ac frequency is at half of the mechanical resonant frequency of the beam. I tried using...
View ArticleConjugate heat transfer Interface boundary condition
Hello All, I am new to COMSOL. I am trying to solve a 3-D conjugate heat transfer problem with volumetric heat generation in the solid domain. The problem is more like solving for a temperature profile...
View ArticleHow to change font size in the help of Comsol?
Hi, I am using Comsol Livelink for Matlab and I open the Comsol help from Matlab (using 'mphdoc' command). The help browser that I open looks exactly like the help browser of Matlab and even give as...
View ArticleDefine a selection from the solution
Hi, I am solving a two-phase system and I want to know, how can I calculate the time-dependent rise velocity of the bubble (in the file below)? In my case the domain selection is not possible because...
View ArticleExtract Data from a Parameterized Surface
Hello, In my comsol model I would like to extract the electric and magnetic fields on the surface of a sphere. What I do now is the following: 1) I define a Parameterized Surface in the Results>Data...
View Article