Establishing upper and lower limits for a PDE dependent variable
Hi! I'm solving a PDE system in the physics Coefficient Form PDE and I need to stablish and upper and lower limits for the output values of my dependent variables. Thank you!
View ArticleUsing a step function for a stationary study
I am attempting to model a cyclone using the k-epsilon solver and occasionally get some convergence issues. Would it make sense to use a step function to ramp up the inlet velocity? Can I use a step...
View ArticleRotate Plane View
Is there a way to select to xz plane view and rotate the view so the z axis is point up? I want to take screen shots to put into a report, but I need my model to be seen as standing up. There should be...
View ArticleError while processing
Sir, While computing the results for my model, I got an error which says" Failed to find consistent initial values. Segregated group 2 Out of memory during assembly. Last time step is not converged. -...
View ArticleViolating basic transformer equation
Hello all , I am doing simulation of two coil system with some gap between the coil , the problem is I defined the No.of turns in Multi turn coil domain and excited with voltage of 220 V , When i am...
View ArticleMetal Hydride Storage Simulation
Hello I am trying to explore the possibility of using COMSOL to simulate the Hydrogen storage in solid metal hydride. I have seen several papers using COMSOL for this purpose. I still do not have the...
View ArticleSolid mechanics and element settings
Hi! I am analysing stresses and displacements of simple 2D steel plate with Comsol 4.2. I need to get results calculated by triangle linear plane stress elements for comparison. How can I change...
View ArticleHow to calculate the displacement of crack
I need to find the displacement (u) of a crack on a 2D centre crack plate under a load. I need to find how large the crack has gotten under the load How can I do this?
View Articlemef in time dependent
Hello to everyone. I have one question regarding the possibility to carry out a Time Dependent Study in mef. There is one good example of Integrated Square-Shaped Spiral Inductor...
View ArticleHeat loss in hydraulic hose
Hi, I'm working on an project where it's in my interest to find the heat loss to the surroundings, from the hydraulic fluid inside a hose. I have access to Comsol Multiphysics 4.3 through my work and...
View ArticleScaling of motional mass
Hello everyone, Thanks to this forum I have found out how to calculate the motional mass for different vibrational structures. The calculation of (MPF_mod1.u^2)/(TotalMass) and for v and w gives a nice...
View ArticleUser Suggestions for the COMSOL Community
We would like to know your input on any suggestions or features that you would like to see in the COMSOL Community Section. Please reply back to us in this thread with any ideas or features that you...
View ArticleProblem with create new solution in comsol 4.1
Hi I have problem with crating a solution using script in Comsol 4.1. In help I read that Comsol enabled functionality to manipulate solutions (see help model.sol). I want to creates a solution object...
View Article2D interpolation of material properties as function of Temperature and Pressure?
Hi, I see that COMSOL 4.2a allows 2D interpolations, how would that be used to interpolate fluid properties, such as density, conductivity, cp, etc, as functions of temperature and pressure of the...
View ArticleParticles traveling through boundaries
Hello All, I am attempting to use the particle tracing function on a laminar flow in a small channel with obstructions in the channel. I modeled the design after the lunchtime seminar on the particle...
View ArticleEigenfrequency seems right, but displacement units are totally wrong.
Dear Comsol Community, in the model attached I have a 20 micron long beam using the Solid Mechanics module to get the Eigenfrequencies. I calculated them manually using Euler-Beam theory and the first...
View ArticleProblems about Periodic Conditions in the tutorial model “Periodic Boundary...
Hi all, Recently I confront one confusion about periodic conditions in the tutorial model - Periodic Boundary Condition. In Periodic Condition, it selects only boundaries 1 and 6 which are parallel...
View ArticlePreparation of figures for papers/thesis?
If it has been written somewhere, can someone point me to where there is a guide to producing figures from 2D plots? I am using COMSOL 4.2a, and want to use some surface plots alongside legends of the...
View Articleweak form of transient heat conduction in solids
Hello all, I'm trying to come up with a transient weak formulation of heat conduction through solids. The equation of interest is: rho.C.dT/dt + del(q)=Q I have already successfully implemented the...
View ArticleHeavyside-Function and Divison by Zero
Hi I stumble realising a Gaussian-beam like in the tutorial model "Nanorods" (using RF-module). Problem: Part of the wave function has a singularity: constant/z Solution in tutorial: Define a...
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