How to define a prescribed initial guess for a topology optimization problem?
Dear Mr./Miss.,In topology optimization, different initial guess may result in different final topologies. In COMSOL “topology optimization node”, if initial value of the design variable theta==1,...
View ArticleInitial perturbation of displacement field
Hello, I try to solve a wrinkling problem of a membrane and i would like to provide initial random perturbation of displacement field. What is the proper way of defining my own initial solution?Thank...
View ArticleInquiry of Module in COMSOL 5.4
HelloI would like to model flow and heat transfer of nanofluid through a microchannel for a nanofluid concentration of 1-5%. I would like to calculate different forces like, drag, lift, brownian,...
View ArticleA very easy question?How can I control control the duration of the heat source？
I want to sim the thermal wave ndt progress, and i need the heatresource just continue 30s，but i dont know how to setup, hope you may help, thanks a lot
View ArticleElement order of Gauss point data? How many integration point?
Dear all,I am going to use the Gauss point data to define a material properties. I am confused by the element order of the Gauss point data, say 0, 2, 4,6,8 ,10.... Does these number mean the...
View ArticleConnecting 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...
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