calculating change in refractive index in acousto-optic tunable filter
I am working on acousto-optic tunable filter (AOTF). I did acoustic simulations on COMSOL to find Rayleigh velocity and electromechanical coupling co-efficient in layer structure by changing layer...
View ArticleComputing the noise produced during snap through effect
Hi,I am trying to find the noise produced when a arch shaped structure snaps from one configuration to the next when loaded with a vertical boundary load. I was trying to link the structural mechanics...
View ArticlePlane symmetry /// Solid Mechanics Module
Hi there,I have a 3D model with a symmetry plane. I cannot find any boundary condition in my COMSOL's 5.0 Solid Mechanics module for symmetry. Am I missing it, or the symmetry boundary condition is...
View ArticleHow to get voltage ?
I have developed a COMSOL program to find voltage from coils.In this program, i have placed a big cylinder, in opposite sites of cylinder i have placed 3 turn coils, one in clockwise(Coil1) and other...
View ArticleExcluding geometry boundaries from meshing, but maintaining them as domains
Hi there,I am currently working on a 2D CFD-simulation, and I've come accross the following problem to which I cannot find a solution:I want to define three additional domains in the geometry I've...
View ArticleHow to define a variable for a range of values?
Hi,I am trying to simulate a spontaneous fluid uptake process in a rock where capillary pressure is the driving force. I am using Coefficient Form PDE physics. In such a case, only damping coefficient...
View Articletemperature distribution by depth
I'd like to see temperature distribution by depth. Please
View ArticleOptical property
I would like to add a light factor (absorbing factor, scattering factor) for each layer of skin. Can you tell me how to do it?
View ArticleSolve Errors
Hello Can any one help me in seetling the errors of my model, so that I can easly evaluate Admitance? Thanks in advance
View ArticleMagnetic fields : Coil error - solve in Coil Geometry Analysis step
Hei.Im building a gradient coil for MRI. The model consists of many square coils. When im building it im getting an error " Numeric coil Coil 1 (coil1) not solved for. Solve it in a Coil Geometry...
View ArticleSolving steady-state two-phase creeping flow
Hi,I am trying to simulate steady-state two-phase flow of air and water in a conduit which has an air water interface. The flow is pressure gradient driven and is steady and uniform. At the air water...
View Articlei want to compare the analytic solution with the solution obtained with comsol
Hi , i calculate the analytic solution of the distribution of temperature in a hollow cylinder . I did the simulation in comsol , and i draw the temperature in comsol see figure 1my problem now i want...
View ArticleErrors in External material model
Dear All:I developed an inelastic model by using external material model. However, I always got errors like:Recoverable error in residual, but solver could not recover. Time: 4.5 s. Last time step is...
View ArticleUnable to get Error vs iteration number plot for convergence plot
Hi,I couldn't get the error vs iteration number plot in comsol 5.3a. Every time reciprocal step size vs time step is coming as default convergence plot. Which is not really helpful for error plot...
View ArticleHydrogen Peroxide decomposition modeling
Dear Proffessionals,I am new to Comsol and looking for a possibility to model the decomposition of concentrated hydrogen peroxide on silver catalyst under the pressure. can you please advise me the...
View Articlesolving wave equation on composite domain
I have the most simplest composite domain with two 1x1 subdomains connected by an interface at y=1.Now, this interface satifies continuity condition for the displacement and flux as they do. And also,....
View ArticleHow to export parametric sweep results with different domain among different...
I am using the Mathematics PDE general form module to solve some PDE. When I export the results (say the solution at the final time step) to .txt format, the resulting file has two columns. The first...
View ArticleVelocity input: surface waves
Hi,I am designing a numerical wave tank using COMSOL to study FSI problem (Fluid structure Interaction, Two phase flow, Phase field) . At present I am using mesh displacement for a moving paddle to...
View ArticleNeed help, after optimized, there is only a 2D flat left
The model is a 3D plate, loading on the top. When optimize the structure (the objective is to maximize compliance), there is only a 2D flat left. I already set a constrain of volume which using the...
View ArticleComsol Crashes due to a fail in writing core dump
Hello everyone I am using Comsol 5.5 on windows 7, with 32 GB ram. Every time I run my model, after a couple of time steps, the comsol window closes and a new error file (*.log) apears in the...
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