cubic bezier curve
Hello! I have some problems in a project: In the geometry I attached to this message I designed a part of tensile test sample to simulate the stress and strain in the sample. Between the upper, broader...
View ArticlePiezoelectric Device 3D
I'm a quite new user in Comsol, and I have some doubts about the Piezoelectric Devices (pzd) Module. I have built a model with 2 ceramic rings (see the model in the attached file), that are suposed to...
View ArticleSolution isn't converging
Hello everyone, I'm having a problem with my simulation, where it isn't converging. It's a very thin plate (10 nm) of graphene, and the dimensions of it are around 0,5 um. I've made a simulation where...
View ArticleGeometry of a cylinder
Hello! I am a beginner in COMSOL and i would like to ask you about the dimensions of a cylinder in 3D! In my model i have to design two cylinders with the next dimensions: the first one with radius =...
View Articlesimply supported beam
Hi, How do i define the constraints for a simply supported reinforced concrete beam which has both truss and solid mechanics elements. Do I use boundary conditions or edge conditions
View ArticleModeling Capacitor with Electric Currents
Hi, So I am trying to model a parallel plate capacitor with a variable overlap between the plates. Going through the ACDC models in COMSOL, I don't really understand how using electric currents can be...
View ArticleSimple Contact Mechanics Problem
Hi All, I have been struggling a little with trying to implement a contact mechanics. I am modelling indentation of a hybrid polymer base layer in 2D. The polymer base layer is a combination of two...
View ArticleHow to couple pore water pressure to simulate triaxial test using Cam-clay model
Here are some questions I want to ask. Thanks! the figures are in doc file. Problem description: We want to simulate the behavior of soil sample from a trialxial test. The cam-clay model here is...
View ArticleVelocity gradient expression in 2D-axisymmetric
Hello, the velocity gradient tensor for a 2D-axisymmetric problem presents, for the phiphi component, the following expression chns.graduDGphiphi = if(abs(r)<0.0010*h,d(u,r),u/r) does anyone know...
View ArticlePoission's ratio problem related to Structural Mechnics
Dear all, I just started to learn COMSOL and tried to conduct a simple simulation of deformation of an elastic plate by a face load. I used Solid Mechanics model in 4.3 edtion. 1. When I set the...
View ArticleElectric field not adjusting with moving mesh
Hi, I have created a model which is effectively a capacitor with a moving plate. I have ground electrodes on the fixed top plate and +/-100V electrodes on the bottom moving plate. I am using ALE with...
View Articlehow to set the domain temperature?
In heat transfer in solid model I need to set the domain temperature as a constant value(such as T=300K) In all the computing process. Now I can only set the boundary temperature.Thanks.
View Articlehow to set the domain temperature?
In heat transfer in solid model I need to set the domain temperature as a constant value(such as T=300K) In all the computing process. Now I can only set the boundary temperature.Thanks.
View ArticleAC Electrical Field simulation in interdigit structure
hi I want to do AC filed simulation for interdigit structure. I am wondering what kind of physics should I select and how I can apply AC signal to my structure? I would appreciate any help
View ArticleDefine simple-support boundary condition of a beam (Solid Mechanics)
Hello everyone, I am a new Comsol user and through the past few months I have made simple models comparing the results with some theoretical models. I will bother you with plenty of questions the next...
View ArticleIssues with Full Coupling of Physics
Good day, I am having issues with fully coupling two physics. My system contains the solid mechanics physics coupled with a general form PDE to model concentration change and the diffusive properties...
View Articlejpeg to dxf
Hello everyone, I am trying to import an image in to my model however i am not clear on how to convert the .jpeg to .dxf, i tried a few online softwares but of no use. May your expertise assist me....
View ArticleAdding a weak contribution to a fluid domain
Hello, Can anyone please help me to add a modified continuity equation in fluid domain, I came to understand that by adding a weak contribution node, it is possible to modify equations.....Has someone...
View Articlewhich kind of solver?
Hi all, i am doing some kind of simulation in RF using 4.3 version comsol and the RAM of my computer is about 30G , how to select the best solver to use almost of my RAM to finish the task as faster as...
View Articleanalytic function in another analytic function
Hi, I have two questions: 1. an analytic cunction that has one argument - sigmaxx that I want to incorperate in another analytic function that has another argument = ec.normE. I cant do it no matter...
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