Eigenfrequency Problem
Good evening, I'd like to know if there's a way to find the highest, maximum , eigerfrequency of a structure using COMSOL.
View Articlechanging boundary cond. with time
Hello, I want to ask for advice how to change boundary condition in time. E.g. I have exact temperature on boundary for 3600 sec. and after this time, I want to change this boundary to insulation. I've...
View ArticleProblem with meshing in a microfluidic channel.
Hey all, I am trying to simulate the deflection of a half-sphere, with ALE Fluid-structure interaction, stuck on the bottom surface of a microfluidic channel (height = 50 um and width = 300 um) and it...
View ArticleError: 7161 The mass matrix is zero - resolve
Respected sir/ma'am, I am trying to simulate a Nano ElectroMechanical Switch(NEMS) using the following modules:a)solid, stress-strain, b) Moving Mesh, and c)Electrostatics. When i run the solver, it...
View Articlefailed to evaluate variables
Hi , I am building a 3d model of fluid flowing around a wafer using 4.3a. The following error occured when I tried to plot the pressure on the edge of the wafer. Cannot ecaluate expression. Failed to...
View Articledifferent physics with different meshes in 3D
Hello, I work on a casting model with a phase change in a metallurgy process. The 2D-axy model works fine and i begin the 3D model. I work on a 3D coupled problem with different physics: mf for...
View Articlenegative concentrations with high reaction terms in biokinetic models
Hi, I am using a biokinetic model based on the ASM (activated sludge models) to simulate water contaminant removal in a gravel filter. This kind of models consider the degradation of the influent...
View ArticlePiezoresistive modeling
Hello all I want to simulate a piezoresistive beam with Comsol. I was looking to find an example of piezoresistive modeling to find out what module they usually use and how are the settings but i...
View ArticleProblem about Joule heating and thermal expansion
Hi I want to inject ac current (amplitude is fixed) to a silicon beam and hope to see maximum expansion when the ac frequency is at half of the mechanical resonant frequency of the beam. I tried using...
View ArticleMie scattering in 4.3
Hello, I have already seen some discussion about mid scattering of a gold nanosphere. But I the discussions I have consulted, no one has yet implemented a mie scattering program in Comsol 4.2 or 4.3...
View ArticleNew "Introduction to COMSOL Multiphysics" book now available
Hello, We are pleased to announce that a new version of the "Introduction to COMSOL Multiphysics" book is now available for immediate download...
View ArticleHow to set initial velocity in level-set method two phase flow for one phase
Hi guys, I am trying to set the initial velocity for a droplet as fluid 1, how can I set an initial velocity for the bulk of fluid (for example the the continuous phase or the drop) in level set...
View ArticleOutput pressure of the transducer in frequency domain
Hello,everyone I'm doing research in capacitive ultrasonic transducer. I use the electromechanic model and want to observe the output pressure in the frequency domain. Now I can add the biased voltage...
View ArticleElectric field between electrodes
Hello I am trying to make a very simple model to calculate electric field between two electrodes in water facing each other(using electrostatics module). I set for the electrode boundaries opposite...
View ArticleSimulation of leakage flux from transformer
Hello. I've tried to simulate a quantity of leakage flux from transformer by using COMSOL 4.3a. To do this, I made a simple transformer model with LiveLink for AutoCAD.(I want to attach mph file, but...
View Articlebistatic radar cross section
Hello! I studied the given tutorial related to radar cross section. Unfortunately, these only provides how to plot monostatic RCS. I tried to use parametric sweep, but it wasn't successful. Can I get...
View ArticleWarning: Edge is much shorter than the specified minimum element size.
I am trying to mesh a 3D integrated concrete masonry block. The geometry is somewhat complex but the idea is that it is a layered apparatus: brick, foam, brick. I am trying to measure the R-value of...
View ArticleMagntic field analyses using current excitation
Hello, I have started to use Comsol this week and have done some examples, but when I try to simulate my model I hit some set backs. The model has 16 electromagnetic poles with a pair of coils in...
View ArticleAC/DC training courses in Phoenix, AZ and Burlington, MA
An invitation is open for our Discussion Forum readers! You are invited to attend one of our upcoming AC/DC focused training courses that will take place within the next few weeks. The first course...
View ArticleTightly folded Inflatable structure deployment simulation possible in comsol ?
Hi, We have a problem where we need to simulate the deployment of a tightly folded inflatable structure. I have used explicit ALE method in a different software to achieve this, however it takes a long...
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