Beam 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...
View ArticleProblem with multislice view
Hi, I'm new in COMSOL and RF modeling so I started with building existing models from model gallery by following given instructions. At the moment I'm simulating model Biconical Antenna. The results...
View Articlecapacitance of a parallel plate capacitor
These are the steps for my capacitor simulation 1. set two solid blocks (dimensions (25x1x20) ) 1 distance away from each other. 2. set a solid box (65x43x60) to surround the plates of the capacitor....
View ArticleMagnetic force imposing on magnetic fluid in 3D magnetostatic field (no...
Hi Everyone I try to do with a simulation of magnetic fluid imposed on magnetic force in magnetostatic field (no currents), but the results show that there seems to be no magnetic force on magnetic...
View Articledouble parametric sweep in comsol 4.2a
Hi All, I was wondering if it is possible to define to parametric sweep solvers under one study? for example changing the velocity and temperature at the same time. thanks ASAL
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