Error Message "String index out of range: 66"
Hi Everyone, I'm wondering if anyone has ever gotten this message in Comsol and what exactly it means (I'm using version 4.3). I'm getting the error message when I try to run a parametric sweep. I'm...
View ArticleExtract Data from a Parameterized Surface
Hello, In my comsol model I would like to extract the electric and magnetic fields on the surface of a sphere. What I do now is the following: 1) I define a Parameterized Surface in the Results>Data...
View Articlebuilding piezo ring projector (electroacoustic transducer)
Hello, I plan to build piezo ring projector, but I don't decide to build it as 2d axis symmetry or entire 3d model. My electrodes would be located circumferentially. 2d model would be problem because...
View ArticleHow to generate a plane wave from "surface current"
Hi all, I'm currently doing a simulation about the photothermal effect of nanoparticles. I'm planning to repeat a simple example in the reference (pubs.rsc.org/en/content/articlepdf/2012/lc/c2lc40495h)...
View ArticleBeam deflection
Hi, I am using a electric field to pull in a cantilever. It is supposed to be a first step of using comsol. So everything works fine as long as i don't involve a moving mesh. I get an "Duplicate...
View ArticleProblem about Joule heating and thermal expansion
Hi I want to inject ac current (amplitude is fixed) to a silicon beam and hope to see maximum expansion when the ac frequency is at half of the mechanical resonant frequency of the beam. I tried using...
View ArticleConjugate heat transfer Interface boundary condition
Hello All, I am new to COMSOL. I am trying to solve a 3-D conjugate heat transfer problem with volumetric heat generation in the solid domain. The problem is more like solving for a temperature profile...
View ArticleSphere-Sphere Forces
Hello. Firstly, greetings to everyone, I am new here. So, I am trying to build a model based on this article:www.google.com/url?sa=t&rc...mp;sig2=HC5XPGRvo0qippVGnfngLg I am also new to...
View Articleusing a time dependent function
Hi I'm trying to use a time dependent boundary condition with matlab. I need to simulate a boundary condition that change in a fixed sampling time, for example, every 15 seconds the value in the...
View ArticleConjugate heat transfer pipe flow
Hello, I am trying to simulate a very simple laminar flow inside a pipe problem with a constant temperature at the walls. I have a cylinder made of water(liquid), and where one part is kept at a...
View ArticleQuestion about the triaxial test
I have a problem about the example in the model library. There is a step in the example, which i don't understand. Integration 1 1 ) Right-click Definitions and choose Model Couplings>Integration. 2...
View ArticlePiezo actuator in Fluid
Hi i want to simulate MEMS resonator with Piezo actuator in Fluid in COMSOL 4.3,but i don‘t know,how could i Piezodevice coupling to Fluid.Which ”Physics“should i use？Fluid-structure-interaction？
View ArticleSolve files in sequence
I have 5 different files that I would like to solve, each with slightly different parameters. Is there a way to tell COMSOL to solve a sequence of files and save the results so I can walk away and...
View ArticleCacluate power exchanged between solid/fluid and solid/solid
Dear all, I've solved a coupled linear elasto-acoustic model using COMSOL's Acoustic-Solid Interaction module. During the post-processing I would like to calculate energy balances to better analyze the...
View ArticleSystem configuration for 3D models
Hi, We are trying to solve 3D models with 25-30 lacs DOF. Our current system configuration is: 4GB RAM, 2.67 GHz Quadcore Processor, 64-bit OS hence we receive an error saying"Out of memory during LU...
View ArticleError:-18
Dear COMSOL Expert, When I run my own created model using COMSOL LIVELINK with MATLAB, COMSOL with MATLAB window shows an error:-18. After all the commands in the function scripts are executed, it...
View ArticleApplying compressive and tensile modulus in COMSOL
Hi everyone I'm modelling a composite material using COMSOL. This material has different Young's modulus in tension and compression. Therefore there are two modulus of elasticity: compressive modulus...
View Articlewhere can i find the error message in the help documents of comsol4.1?
Error ,saying undefined value found, occured during the solving, where can i find the relevant explanation for this error?
View Articleproblem in initial value in matlab
Hi I'm simulating a model in matlab for a sampling time 3 s. After this i use the last simulation as initial condition for the next iteration. I use the following code (as the tutorial): for k = 1:nit...
View ArticleAdaptive Mesh
Hi every body. I am simulating 2D level set two phase flow fluid in transient form. I would like to use Adaptive Mesh for my model. I tried alot for finding example and doc for that but I couldnt find...
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