High Order Coupled PDE
I have 4th order PDE which is broken into 2 second order PDE and i need to solve them in COMSOL. I tried using general form/coeff form pde of COMSOL but unfortunately i couldnt get results.Here are the...
View ArticleFrequency Domain not Converging
Hello,I'm trying to design a nonlinear MEMS energy harvester: * I am using a fine swept mesh. * Material: Silicone polycrystiline * physics: solid mechanics. * Boundary conditions: fixed at one end. *...
View Articlepiezoelectric energy harvester
hello all, I am planning to simulate the below figure. I am applying force on one PZT plate, so it will deflect downwards and strikes the second PZT one. I used contact pair modelling but when I...
View ArticleSolving a system of equations in COMSOL
Hello, I am working with the 5.2a Battery & Thermal packages. My model computes the generated heat (qh) for three 1D batteries then sending this data to a 3D battery package model to compute...
View ArticleTechnical noise modeling in COMSOL
Dear community,I am a student of engineering and I am preparing for my Thesis. I am currently using COMSOL 5.2a. I need to do technical noise modelling of a PCB. I did not find any examples or...
View ArticleNo solution after switching from creeping to laminar flow regime
Hello everyoneI have a problem, where I cannot find a solution to. My problem I want to solve, is a narrow channel (µm range), where in same parts species are generated (transport of diluted species)....
View ArticleConvergence criteria of the nonlinear solver are met but not all linear...
Hello, I'm runing the free and porous media flow modeling. My target flow rate is 3m/s while it will not converge if I set the target flow rate directly so I run the model step by step (grdually...
View ArticleCreating a 2D surface with a line and varying thickness
Hello COMSOL users,I want to create a 2D surface from a single line with varying thickness. (Please see the image attached.) I wonder if this is possible in COMSOL. (probably setting the thickness var...
View ArticleOrientation of grains
Can someone help me to see the orientation of grains in a simple sheet (block) using COMSOL?
View Articlehow the electric discharge take place in comsol
any body can tell me that how i can come to know that at what point or at what level of votage discharge taking place if i apply the voltage to my prepared modle than how i come to know that at which...
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Best way to define the characteristic/indicator function of a square?
Hi,I was wondering if there is not a better way (shorter) to define a characteristic/indicator function of a square/cube than with the function "flc1hs". Indeed, when I use flc1hs (or one of his...
View ArticleCorrective term for convective transport
Hi,i am modelling ion transport through a nanofiltration membrane with the Nernst-Planck equation. I am assuming that the membrane consists of small pores, so the ions are hindered while moving through...
View ArticleTechnical noise modelling PCB
Dear community,I am currently using COMSOL 5.2a. I need to do technical noise modelling of a PCB. I did not find any examples or tutorials, which might help me apart from the...
View Articleheay pipe simulation: Feature: Stationary Solver 1 (sol4/s1) Undefined...
Hello, I want to simulate one cylindrical heat pipe with condition 20M w/m^2 on the top only.And we try to use water inside.I found that there was an example on the web, 'flat_heat_pipe', so I did the...
View ArticleCalculating total power in the far field
HelloHow can I find the total power in the far field? Can I do this by integrating the following expression over the simulation sphere:ewfd.(normE^2)/(2*Z0_const)When I do this I get a very small value
View Articlewhy changing variables in linear elastic material equations when simulating...
I am a freshman of this software and I just start the first thermal actuator simulation following COMSOL tutorial.There is a step called Linear Elastic Material 1 and some variables are changed as the...
View ArticleActivated charcoal for air purifier model
Good morning, I'm quite new with the software and I just would like to ask: what's the proper module to model an air purifier based on activated charcoal technology?I'd like to have just a 2D model...
View ArticleCombining Wave Optics and Electrostatics in simulations
Hi all,I'm an engineering student trying to model a localized surface plasmon resonance (LSPR) of a metal nano particle (using wave optics) in the influance of a external static electric field.I tried...
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Temperature profile
How do I plot the graph of temperature against time having reading of temperature 1,2 and 3 at 10 seconds intervals
View ArticleAccessing Plot Values from Application Builder
How can I access 2D Far Field Radiation Pattern Plot values from application builder.Or maybe I should ask my question in a more general way: How can I access the values of the plots in the Results...
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