2D corona Discharge
Hi everyone i'm trying to simulate corona discharge between two electrodes in comsol 5.2 the mesh is triangular with boundary layer mesh. i have built my model based on the example in the software's...
View ArticlePeriodic Boundary Conditions and Pointwise Constraint
I am using Periodic Boundary Conditions along with Pointwise Constraint on domains in my 3D model with general PDE. I noticed that convergence difficulty arises due to conflict between periodic...
View ArticleI want the optimization solver to evaluate the objective at all time steps
Hello, I am using the optimization module in conjunction with the Heat Transfert in Solids and the Solid Mechanics. After computation, I always get the warning message: ' The objective is only...
View ArticleFailed to evaluate variable Jacobian
Hello everyone, I am using comsol V4.3a. I am trying to simulate of one nano-plasmonic problem. But I am having the following prob. Failed to evaluate variable Jacobian. - Variable: mod1.emw.relcurlEz...
View ArticleProblem regarding two phase fluid flow
This model is a basic fluid flow model. Even when I select the required files and load them into the software following the tutorial yet it shows " unexpected errors" and at some places " undefined...
View ArticleQuestion on the analysis of contradictory results
Hi, My simulation consists in passing a fluid in a path of variable form. However, for a speed "x", I get a 2D graph with a stationary study. But for the same speed, when I do a time-dependent study,...
View ArticlePeriodic boundary conditions
Hey, I am trying to solve a representative volume element in a composite material subjected to a uniaxial stretch. The faces along the x-axis are subjected to periodic displacements. This can be easily...
View Articlehow to add forced vibration and base excitation to a mechanical cantilever ?
Hello everyone :) Iam new user of COMSOL 5.0 I built up till now a cantilever beam and defined geometry .. material .. mesh .. BC .. and solved the model and got the eigenfrequencies ... Now , I am...
View ArticleHow to deal with discontinuous heterogeneous data in 2D geometry
I am trying to model two phase flow in a 2-D porous media. There are four types of sands in the domain and thus four different entry capillary pressure. The variation of the capillary pressure becomes...
View Articlehow to apply base excitation to a mechanical cantilever
hello everyone i have problem with modelling forced vibration for a regular cantilever i have tried adding prescribed displacement with sin function amplitude to the base but it goes with error iam...
View ArticleEddy magnetic levitation system
Hey, I'm working on hyperloop Eddy magnetic levitation system for my senior project, so i need to simulate the movement of group of permanent magnets in Halbach array formation over simple alumunium...
View ArticleCPU Clock Usage
Hello, Me and my mentor are using an Intel Xeon e5 v4 processor with 3.70 Ghz maximum frequency on Windows 10. We are solving battery problem with heat transfer coupling. As we noticed, while the...
View ArticleParametric sweep of geometry with particle tracing study
Hi all, I'm studying the effect of the position of an electrode (electrostatic) on the trajectory of particles flying through said geometry. I would like to achieve this with a parametric sweep of the...
View ArticleContact is not working
I'm doing a stationary simulation of a bracket using Solid Mechanics physics. The intention is to know where there are the highest stress and compare with data obtained from an experiment. But the...
View ArticleProblem converging a time dependent study
Hi Comsol community, I started using Comsol few months ago. I aim to model the mixing by diffusion of two ionic solutions in a Y microfluidic junction (to eventually model precipitation of CaCO3). I am...
View ArticleHow to access the cpu time?
Hello community! In order to compare the computational performance of different models I would like to compare the cpu time. Is it possible to access it? Many thanks in advance! Alexander
View ArticleThe other problem; out of memory during LU factorization
Hello, everyone I have a little different problem with others First, my error message is similar with the others"Failed to find a solution. Out of memory during LU factorization. Returned solution is...
View Articlereacf(V)
Hi, Does anyone know precisely how reacf(V) is computed? COMSOL uses it to give a more accurate computation of flux then standard methods. I cannot find it documented in detail anywhere.
View ArticleMesh convergence in in acoustic module
Hello, I know that for acoustic models, at least 5-6 mesh per wavelength is required. I have done a parametric sweep study which changes the mesh density from 2 to 20 mesh per wavelength. The problem...
View ArticleLimiting the Parametric Sweep study step to a specific step(s) in the study.
I'm doing a small signal analysis (stationary, freq-perturbation) and I want to run a parametric sweep (on geometry) for the stationary step only. I can't seem to figure out how to isolate this within...
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