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function

Can anyone please help to write the above equation Y=X0*(1+sin*(w*t)) where w=2*pi*f (rad/s), t=argument(s) I have tried with analytical function after defining w in variables and all other constants...

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Microchannel

I need to connect an external current source to the electrode used in my model using electric circuit interface.the electrodes are used in Primary current distribution in electro-chemistry module .is...

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ERROR: nonlinear solver did not converge, when simulating ball movement in...

Hi all, I have seen several threads about this error and tried to figure it out myself using the sample cases but I still fail to simulate this. Any help will be greatly appreciated. I am trying to...

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Data export using Matlab Livelink

I have designed a magnetic coil model in COMSOL and successfully imported it in MATLAB. I am plotting norm of magnetic flux in COMSOL Model. Now I want to extract the magnetic flux data in a MATLAB...

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Coupled electromagnetics-solid mechanics study

Hi, I'd like to couple an electromagnetical eigenmode study to a forced-response solid mechanics study. More specifically, I want to do the following: 1. Solve electromagnetics model for two eigenmodes...

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interaction valve-blood

Hi! i've to simulate the interaction between an aortic valve and the blood (i use comsol 3.4). I've a pipe with two leaflets fixed with a hinge. These are what i've imposed: incompressible navier...

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"Time derivative only allowed with respect to mesh time." New error message...

Hi everyone, I just upgraded to COMSOL 4.2a. When I try to run a model file which works in Comsol 4.2 I get a new error I can't seem to troubleshoot. "Time derivative only allowed with respect to mesh...

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Gold nanoshell simulation. Why the scattering curve is below zero?

Hi, I modified a model of Mie scattering off gold plasmonic nanopartical to simulate the gold nanoshell structure I found on comsol forum. I just add a sphere inside the original particle and built a...

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Thin Film BAW Composite Resonator simulation in COMOSL 3.5a

I'm currently engaged in the simulation of FBAR device in COMSOL 3.5a, and want to use this model. However, "in the model library", I find that the admittance of electrode is defined as...

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extracting data from comsol to matlab through mphinterp

Hello, I have implemented the mphinterp function but when I want to extract results for different parameters something goes wrong. My typical comsolfiles look something like this: - In the Study...

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tumor ablation model

hello, i am trying to make a model like" tumor ablation" model in comsol Heat Transfer Module but i want to change the current from DC to AC current and i want to plot the electric field distribution,...

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Simulation of a floor heating

Hi all, I want to simulate a floor heating in a 2D modell. Floor heating systems release about 90 % of heat in the form of radiation and about 10 % in the form of convection. So is it possible to take...

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How I can add data for a solution to a new study?

I'm working on the simulation of an iron foundry, I made a transient thermal study, and I exported data solution in time 200seg temperatures. I would like to know how I can add the output exported to a...

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Comsol, Matlab and xmesh-error

Hey, I trie to run my Comsol simulation via Matlab because I want to loop some parameters. For test-reasons I try to run the tomograph tutorial as it solves quick. I'm using Comsol 3.5 but when...

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Comsol issue on Linux

We had a simulation computing for about 3 weeks and paused it to quickly analyse some results. We created a graph and then Comsol stopped responding. It uses 100% of one of the CPU on our Linux...

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Variables

Hi everyone, I have a simple question for you. If I have a variable 'D' , coeficient difusion, depends to temperature (T) with the expression D(T)=0.29*T. the range of temperature is (900 kelvin to...

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parameters

Hi everyone, I have a simple question for you. If I have a variable 'D' , coeficient difusion, depends to temperature (T) with the expression D(T)=0.29*T. the range of temperature is (900 kelvin to...

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Mie 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...

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optical Waveguide

Hi I am defining 2D waveguide from Er:Ta2o5 waveguide in top and bottom of sio2 substrate, now i want to define electromagnetic wave to this.and then i want to calculate the gain. 1-how can i excite...

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Reacting flow, diluted species

Dear all, I am currently simulating the reaction of a dilute compound which flows through a cylindrical tube under laminar flow conditions. I am trying to use the physics method "Reacting flow, diluted...

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