Using only part of saved solution Comsol v4.4
Hi all, I am studying the acoustic response of a spherical shell. I am doing an acoustic-solid interaction study (frequency domain). I would like to study the acoustic field generated by an oscillating...
View ArticleTemperature echelon imposed for heat conduction
Hi all, I have a temperature condition imposed on space between [y1; y2]: T= constant ; and all others are adiabatic boundaries for the heat conduction problem. Contours of total heat flux magnitude...
View ArticleHeat Flow - Stationary vs Time Dependent study
Good Evening, The mph files for both are added below. My model is shown in attachment (3). It consists of a copper strip on a piece of GaAs which rests on a heat sink made of copper. A 20 V Voltage...
View ArticleMesh memory for large model in parallel computing
Hello everyone, I have a problem with solving a large model in parallel computing with comsol. I have a distributed-parallel processing system with 6 nodes, each has 16 cores. And i have 128 Gb of...
View Articleworkstation for comsol
Hello, i plan on buying a new workstation for COMSOL 5.0. Area of research would be mostly acoustics in general with a wide range of different studies and up to sth like 10M DOFs. Its only possible to...
View Articlecalculating bulk temperature and nusslet number
Hi, If we have a vertical slit that a flow is coming in from the bottom and the walls are heated .how can we calculate the bulk temperture in the slit in comsol? more spesipically if we want to...
View ArticleModelling laser ablation in COMSOL
Hi, I have a fairly simple question about COMSOL. I have made a model in which a block is heated by a pulsing laser heat source. I am using an iterative approach to solve it by solving for each pulse...
View ArticleTransport of diluted species and electrostatics
Dear Community, I am trying to combine the physics of the poisson equation (electrostatics) with the nernst-planck (transport of diluted species) in Comsol 4.1 for like 6 weeks now, and all I get is...
View ArticleHeat dissipation in a plasmonic nanostructure using pulsed laser
I am trying to generate a model where I can look at the heat dissipation in a plasmonic structure when irradiated by a ns pulsed laser. I have managed to make a model where I can solve the emf...
View ArticleCurrent Source and violation of Maxwell-Ampère’s law
Hi, I have setup a model using both Electric Currents and distributed ODE and PDE interfaces using a simple 2D square geometry. One boundary of the geometry is set as ground and another used to apply...
View ArticleRestore a Model to a Previously Simulated Version After Reopening
Hello, I have a question regarding restoring a Comsol simulation to a previous version. I successfully ran a Comsol simulation, but I must have made a change to the conditions and then saved it. When I...
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Advanced photonic bandgap (triangular lattice)
Hello, I'm trying to expand the photonic bandgap model (www.comsol.com/model/bandgap-a...ysis-of-a-photonic-crystal-798) to a slightly different structure, but since I'm new to photonic crystals, I'm...
View ArticleCurrent Source and Violation of Current Conservation
Hi I'm using the electric currents interface. My model uses the "current source" feature and the solution COMSOL gives clearly violates current conservation. Has anyone else experienced this? And does...
View ArticleDC discharge modelling query
Hello I am modelling a DC discharge in between 2 electrodes which are positioned asymmetrically. I am making use of the example model in comsol library (positive column-2d). Both models are attached in...
View Articlepoor convergence in MEMS electromechanical switch
Greetings: This is a grossly simplified form of a 3D model I'm doing of an electromechanical switch using the MEMS module. There's a cantilever which is at zero bias, a "gate" electrode which is biased...
View ArticleStop condition function of solver configurations
Can anyone tell me what stop condition is (in Solver configurations> Solution 1> Time-Dependent solver 1> Stop condition)? and why it is not precise! I checked the Single Particle Model of a...
View ArticleTransport through diluted species-Time dependent problem
Hello, I am performing a time dependent analysis for transport through diluted species based on the solution I obtain by performing transport through free and porous region in the same geometry....
View ArticleProblem in one of the Model Library of Comsol 3.5
Hey guys, I'm currently trying the model 'Two Phase Fluid-Structure Interaction' in V3.5's Model Library. You can find this at Model Library-> MEMS Module-> Microfluidics Models->twophase fsi....
View ArticleAssembly problem singularity before contact is established
Hi all, I am trying to use contact in my model. After looking at the COMSOL manual and the discussion forum what I do is first to create an assembly in my geometry and I create the imprints. Then I...
View ArticleUndefined value found in the equation residual vector
hi. i met some problems during simulating a conjugate heat transfer problem. I tried to finer the mesh but it could not help. The detailed description is as following: Undefined value found. - Detail:...
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