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Finding the location of the maximum of a variable

Dear Comsol Community, I am looking for a way to find the location of the maximum of a variable. Getting the maximum value is easy, but so far I have not been able to get the coordinates of the...

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Asynchronous Machine time dependent startup, singularity error

Hello, I am trying to simulate a ASM in the rotating machines physics, time dependent. The Stator slots are coupled to the electrical circuit physics for a Voltage excitation The rotor slots are also...

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Geometric Nonlinearity problem

I have an odd problem. I am trying to recreate the Large Deformation Beam model (www.comsol.com/showroom/documentation/model/204/) before I start my own project to investigate buckling. I was following...

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Stop condition in Electromechanics(emi)

I would like to implement a stop condition similar to what is described for a moving mesh problem. The parametric study would stop when the mesh quality is lower than a certain value, inorder to...

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Variation of density

Hi everybody! I am trying to get effective index variation with density of material. How can I use this using parametric sweep.I am using COMSOL 4.3.Thank you

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About creation of struturegeomerty

Hi...! I am a student of University of Pune,working on Rf MEMS Switch. I can't get how to create a structural geometry of cantilever beam in Com sol multiphysics. So please help me to create a...

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Magnetic Force on an armature

Hello I'm dealing with a very simple problem that has been very frustrating for me! I would appreciate if any one can assist me with that. I'm modeling an E-shaped core in 2D magnetic field module. It...

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Define 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...

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Issues 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...

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Solid Mechanics - Linear Elastic Material - Thermal Expansion

In the solid Mech - Linear Elastic Material - Thermal expansion node, there are two tabs: Model Inputs & Strain reference temperature, which both contain places to write temperature values. What is...

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Coupling B/W two solid stress-strain modules

Hi all, I am trying to model a 3D structural mechanics problem with two separate solid stress-strain modules coupled together at the interfacial boundary through equal displacement boundary condition...

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Animation depending on distance

Hello dear Comsol gurus, I have made a CFD simulation (stationary) which is based on the model library example of the static mixer. I have also generated the slices and surfaces to see how my fluids...

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access to any solution (more than one parameter)

Hello When I do a parametric sweep with only one parameter, I can access to one particular solution with the operator "with", for example, with(1,emw.Ez) gives me the z-electric field for the first...

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Determine Burst Pressure

Hello everybody, I'm working on a mems pressure sensor, I want to know how we can calculate the burst pressure of diaphragm. Any help will be greatly appreciated.

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output data to file via script

I am trying to script a model using the .m file and it seems to be able to do everything including the postprocessing but amazingly I can't seem to find an option to simply output the data to a txt...

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Piezoresistive Coefficients

Hi I want to find out the sensitivity of my piezoresitive cantilver beam. In order to do that, based on the equations, I should have the piezoresistive coefficient (Pi-1): Delta-R/R=(PI-1)*maximum...

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error geometry

what is this error!? please hepl me Failed to evaluate variable. - Variable: mod1.spf.T_stressx - Geometry: 1 - Boundary: 1645 1646 1647 ... 4656 Failed to evaluate expression. - Expression:...

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Colors messed up when exporting GIF

Hello, When I export a GIF from COMSOL, often times the color scheme will be all messed up. Instead of a fluid change from blue to red, I will see about 16 distinct colors. This looks terrible and is...

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2D electrostatic Force

Hi, I am modeling a slice of a simple comb capacitor in 2D. I would like to determine the force acting on the fingers. I can calculate the electric field, but when I try to determine the force through...

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Multiple concentration step function

Hi, Have a great day. I am a new user of comsol 3.5 version, currently, I am working with chronoamperometry and I am trying to simulate that one using comsol by multiple concentration step functions....

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