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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!

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Using 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...

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Rotate 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...

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Error 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. -...

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Violating 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...

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Metal 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...

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Solid 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...

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How 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?

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mef 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...

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Heat 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...

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Scaling 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...

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User 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...

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Problem 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...

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2D 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...

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Particles 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...

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Eigenfrequency 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...

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Problems 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...

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Preparation 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...

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weak 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...

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Heavyside-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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