Connecting Beam Element and Solid Element
Hi,I am trying to simulate four point bending load test on a beam. I modelled reinforcement as beam element instead of truss and concrete as solid elements. Can anyone suggest me how to define...
View ArticleComputing multiple Surface integrals and collecting the data
I'm attempting to compute the shape factor for a single sphere between two walls. I've managed to get a value which looks decent. I am, however, attempting to calculate this value with many different...
View ArticleUsing output data from a study step as an input parameter for a following step
Hi,I have a study where the first step is an Eigenfrequency analysis and the second step is a time dependent structural analysis with a sinusoidal force who’s frequency is the lowest Eigenfrequency...
View ArticleHow to draw Polygon spirals
This might sound like a dumb question, but I need to draw structures to simulate some microdevices but I don't know how to draw them exactly. Is there any equations for drawing spirals like...
View Articlespring connection
hello everyone, i am trying bulid one spring on square plate. i am new to comsol. how to connect spring to plate what about joint?
View ArticleMicrostrip patch antenna
Hi,I am trying to design a microstrip patch antenna in comsol multiphysics software. I saw a video on youtube in which they were designing it in CST software. I had the student version of CST software,...
View Articlehow can i insert rpm to the electrode in electrochemical module?
To simulate ECM i am using electrochemistry module, comsol 5.3a so the problem encountered is to rotate the electrode at a certain rpm in 3D.
View Articlerecovery file can not be detected by the comsol
Dear All, I already have two recovery files in the "recoveries" folder of my Comsol. but Comsol can not detect the later one. As I tried to replace the newer one under the name of the older, it now can...
View ArticleNaN value in Maxwell capacitance
Hi to everyone,I'm trying to perform a simulation of a simple capacitor following this example: https://www.comsol.com/model/computing-capacitance-12689 and applying the dimensions of my system. I...
View ArticleDeformed Geometry + Chemistry
Hello,I am working on a model which describes a chemical dissolution process. My idea was to use the chemistry module which calculates the kinetic data of the surface reaction and couple it with the...
View ArticleCalculation capacity of a parallel plate capacitor by varying the permittivity
Good morning, I am recently using Comsol multiphisycs 5.1. I created a model for the study of a parallel plate capacitor with mica dielectric. Now to test the sensitivity of the design I would like to...
View ArticleActivate Geometry During Simulation
Hi,I have a question about how I can activate parts of a geometry after a certain time during my simulation. So I have two layers, start with the bottom layer and want to activate the next one after...
View ArticleSweat Duct Modelling COMSOL
Hello,I am trying to model an eccrine sweat duct on COMSOL. The model must have a source of water with NaCl concentration and an outflow through the pore to the skin.There must be reabsorption of water...
View ArticleHow to find out the shear stress distribution of the fluid from velocity...
I need to find out shear stress distribution profile of the fluid in my geometry. How do I go ahead from velocity profile ?It is laminar flow, stationery/time-dependent study with water as...
View ArticleErrors in Computation
Hello, I am a new user to COMSOL and I see this in one of my studies Undefined variable. - Variable: exp - Geometry: geom1 - Domain: 1 Failed to evaluate Jacobian of expression. - Expression:...
View ArticleChallenge simulation
COMSOL colleagues and users:I have two challenge simulations I would like to propose in using COMSOL. I would like to use this forum to hear additional proposed simulations from other folks.tornado - I...
View ArticleSecondary current distribution
In the steady-state research case of high-temperature proton exchange membrane fuel cells, a secondary current distribution model was adopted, where a fixed boundary potential E_cell condition was...
View ArticleDifference between current density and induced current density
Hello, I'm using the AC/DC module and I need to know the difference between "current density mf.Jx, mf.Jy,mf.Jz"(apparently it's the quantity from Faradays law of induction) and the "induced current...
View ArticleMicrostrip Patch Antenna Radiation Pattern
I examine the "Microstrip Patch Antenna" example in the application libraries. I just want to see the radiation pattern of the antenna. I selected "emw.gaindBEfar" expression to see the far-field gain...
View ArticleStatistical pit formation
I am working on a pit corrosion model and was able to describe the growth of a single pit. Is it possible to include a statistical approach into Comsol so the pits appear as a function of time e.g. as...
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