Simulating Rayleigh II integral
Hi, I have been trying to calculate the propagation matrix that is found in Rayleigh II integral, using simulated data from COMSOL. I want to use such matrix in pressure-to-pressure calculations with...
View Articlescaling in contact analysis
Hello, What is the function of scaling in mechanical contact analysis (it is located under study>solver configurations>dependent variables)? Does it have any effect on the solution? If it is,...
View ArticleDerivative of Normal on a Surface
Hello. Any help would be greatly appreciated. I am trying to calculate the mean curvature on a boundary. To do this, I am trying to calculate the dot product of the surface gradient operator and the...
View ArticleElectromigration,Free Equation Modeling
Hello, I am studying several articles and modeling them in Comsol for verification. The PDE is as follows: dC/dt= d^2C/dx^2 - alpha* dC/dx (Lloyd and Clements) and the boundary conditions at both end...
View Articlewhat if the transport mechanism is different?
Hi I am using comsol 4.3a and i have some problem with modelling heat transfer in composite object. the actual problem is regeneration of spent activated carbon in a fixed bed. the way it is being done...
View ArticlePlasmonic Biosensor
I need to make a Plasmonic Biosensor in Comsol. I don't know how to use the RF module. I'm good with the geometry but have no clue about the parameters, equations and boundary conditions. Kindly help...
View Article[Solved] Error in Sweep - Invalid Property Value
Hello community, I have a problem with a file that was running fine without parametric sweep. I tried to implement the parameter sweep, but it seems I run into troubles. Here is the error message :""""...
View ArticleCan we impose a MINIMUM STEPSIZE AS A STOP CONDITION?
I loop thousands of transient simulations in matlab and I can't find a solver setting that will stop the solver when the step size becomes very small (history of the stepsize in log file) and the...
View ArticleThe inlet condition in the plasma module
Dear all, I am using the DC plasma module to model a certain discharge. I recently wanted to use the inlet condition in one of my simulations. But the problem is that I always get 'Inconsistent Initial...
View ArticleHow to Couple Free and Porous Media Flow with Heat Transfer In Solids
Hi Everyone, I am new to COMSOL and I am trying to simulate a solar panel cooling system. I am trying to simulate in 2D the heat transfer between a thin rectangular layer (the photovoltaic cell),...
View ArticleVanadium Redox Flow Battery, Model ID: 14153, negative Concentrations
Dear COMSOL Community, I have a question regarding negative Concentrations in the example Vanadium Redox Flow Battery, Model ID: 14153 that is posted in the model gallery....
View Articlewhy it is different between Axial 2D and 3D in Non-Newtonian Flow.
Hellow, i have used this for about 2 weeks. but i have some problems. so i need some help. i drawn a model of the cylinder which is same both them. and they are same values, boudary conditions... but...
View ArticleStore Iteration Results to Prove Convergence?
Hi. Does anyone know how I can plot the solution of a point evaluation with each iteration as it solves? I want to do this as when the number stops changing it helps prove that the solution has...
View ArticleDeformed cantilever length
Hi, I have a cantilever, clamped at one end, 100 units long. It bends under its own weight (so, add a body load in the z direction of solid.rho*g_const). Now, since this cantilever is bending...
View Articlesmart parametric sweep?
Hi, I was wondering if in Parametric sweep it is possible to update Study Settings based on the up-to-date results of the computation (i.e. based on the results computed from the previous step of the...
View ArticleOut of Memory although using more RAM
Hej there, I ran a rarefied gas flow model (transitional flow) on my 16GB RAM machine. I build a 2D model with a D2Q36 quadrature and it runs on my machine. As I want to use an larger quadrature which...
View Articlepizoelectric cantilever enrgy harvester
Dear All, I'm working on pizoelectric cantilever enrgy harvester device, i built it on comsol but i need to know how i can apply force on the cantilever tip, any help?
View ArticleTurbulent Flow to Heat Cylindrical Vacuum Oven in 2D by Time-Dependent Study
Hello community, Here we are trying to simulate a cylindrical vacuum oven in 2D by using Conjugate Heat Transfer with k-epsilon Turbulent Flow. The oven is set as a rectangle with: one inlet, one...
View Articlesingularity error when using the stored solution as initial condition
Hello, I want to solve a time dependent problem using two studies (both time dependent) and use the solution of the first study as the initial condition for the second one. However, when I try to do...
View ArticleComsol runs very slow
Hi there, Am doing a simple Fluid flow analysis, where i change only the flow rates for the same geometry. The simulation was running fine and I get results in a few minutes. Since last two days, the...
View Article