Time-Dependent Modal with short initial impulse
Hi @ all, it is possible to perform an Time-Dependent Modal Study with a short initial impulse e.g. a Gaußimpulse? I want to perform an attenuation analysis and start with a forced oscillation because...
View Articlecardiovascular stent crimping (and expansion)
Hi, I'm working on simulating: 1. the expansion of a cardiovascular stent and 2. the crimping of the same stent from its expanded to its delivery configuration. I've been using as a starting point the...
View ArticleEigenvalues from different study steps
Hi everyone, I am trying to calculate an overlap integral between two modes of different origin -- a common problem of electrooptics or optomechanics. So I have two physics interfaces (say...
View ArticleMoving Heat and load
Hello, I have a question concerning moving boundary conditions in comsol. I have a heat source and a mechanical load which must follow a boundary from the to till the bottom. Which is the practical way...
View Articleİmplementing a (heat) equation on COMSOL
Hello everyoneİve been trying to learn COMSOL since last week.İam trying to implement heat equation solved with Crank-Nicolson scheme.İ think i succeeded in doing that but nothing happens.İ put the...
View Articlewithsol in PDE throws error
In the urgent need of solving the following weak form PDE for \lambda^k \sum_{k=1}^K \int (w \nabla . \nu^k) \lambda^k = b where w is the test function and \nu^k are the K vectors resulting from a...
View ArticleCoupling Solid-Beam in a Time-dependent simulation
Hi I am working with a simplified railway model. I wish to couple a beam with the 3D model structure of the rail and to apply a moving (depends on time) force on a surface, by means of the command...
View ArticleVariable Dependent Parametric Sweep
Hello Everyone, I have been stuck with this issue for sometime now and cannot seem to find a way around it! I am trying to run a parametric sweep over two variables (e.g X and Y). I have defined X to...
View Articlemerging parametric sweep iteration solution
Hello, I want to ask a question about parametric sweep. I want to take one solution of the parametric sweep as the initial value of the next iteration of the study. How can I do. From "the dependent...
View ArticleGeometry variation within Time-Dependent solving.
Hello, I was wondering if it's possible to change geometry according to time ( via internal or external function(MatLab)) ? ie: Making a block depth function of time.
View ArticleSetting pressure
I want to study flow in pipe I want to set v = 0.05 m/s AND p = 5 atmat the inlet How to set them both? I mean, under laminar flow -> inlet -> boundary conditions I can choose one or the other,...
View ArticleSolving a coupled system of convection-diffusion equation
Hi all, I am having trouble solving two coupled pdes, its described below I have a 2d system (square) and from the top boundary a nutrient (C) flows in to the square. I have set the concentration S=S0...
View ArticleAbout conservative flux convection coefficient
hi everyone, im doing the simulation for the partial discharge. i keep encountering the problem when set the conservative flux convection coefficient in the coefficient form PDE model. the enclosed...
View ArticleVery big difference in the results between direct and iterative solvers.
Hello, I am trying to solve a 3D Model using the MEF physics in the frequency Domain. With a rather coarse mesh I am able to solve the model (DoF~1e6) with the direct solver (PARDISO) and the global...
View ArticleGrain growth in copper during heating cycle
How can i simulate grain growth in polycrystelline copper during heating cycle with COMSOL? aim is to consider grain boundaries into consideration instead of taking bulk avarage material properties...
View Articleduplicate parameters/variable names
Hello, I am trying to simulate a FSI model in 2d-asymmetric however, COMSOL is giving me errors of duplicate parameter names. But these parameters seem to be coordinate/spatial variables. I am very...
View Articlecreating a pulse train
hi, I have seen some answers to this question, but non of them works for me, so I will ask here again: I built a model, trying to solve an electrical problem. my boundary condition is "electric...
View ArticleCalculating the volume under an isosurface?
I am using one of the COMSOL tutorial models and I would like to know if there is a way to calculate the volume underneath the isosurface. I am using the heat transfer radiofrequency ablation model....
View ArticleMultiphase modelling of dense suspension help
I was going through the Multiphase model of dense suspensions tutorial and have a doubt in some of the steps. For the uniform concentration, there is no term "eps" in the expression for gamma. But in...
View ArticleFind coordinate for certain conditions (heat transfer)
Hello, I'm working on heat transfer induced by laser. I used axial symmetric boundary condition for the center, and would like to plot Z coordinate at the center (R=0) along with time when the...
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