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calculate resistance of a numeric multi turn coil in freqency domane is to high

Dear all, I hope anybody in this Forum have the same exipiriance width the multi turn coil damane. In my model i have a simple numeric multy-turn-coil domane. My problem is that the calculate...

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Time dependent boundary

Hi all, I have flow through a cylinder, and want the inlet velocity to be periodic [ u(r,t) ]. Im new to comsol and havent been able to find an answer to this. Thanks in advance for any help!.

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precipitation around grains in porous medium

Hi, I am trying to build a model where the idea is that after a chemical reaction CaCl2 + Na2CO3 => CaCO3 (s) + 2 NaCl. CaCO3 precipitate and is immobile. I am using the Reaction Engineering (re),...

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Implementation of boundary conditons at liquid-liquid interface

Hi all, I am simulating a liquid-liquid flow in a channel. The liquid-liquid interface appears to be curved as one phase liquid is dispersed as droplets. I have used the laminar flow single phase...

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Mass transport in tube.

Ok, so I solved the unsteady laminar fluid flow in the tube im looking at. Now, I want to add in a mass transport problem. Say I have a sphere of concentrated dye at the center of the tube, and want to...

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Hydrodynamic drag

Hi All, I am trying to simulate the hydrodynamic drag force on a particle of 8um suspended in a fluid which is flowing at a flow rate of 20uL/min through the micro-channel of 15umx15um entrance/exit...

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Problems with parametric sweep

I have a model that I want to investigate with differens values on at least one of the design variables. If I change the variables value manually and compute, there is no problem but if i use variable...

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Exporting Specific Mesh Data

I am quite new to Comsol so please excuse my ignorance when trying to explain my problem. I am currently working with a model of a redox flow battery, and I am interested in exporting data such as flow...

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Transmission Spectra in RF module

Hi, I'm a beginner in COMSOL. I am using the COMSOL scripting in MatLab. I would like to know how I can get the transmission spectra as shown in Fig 4 of the file attached below. I am looking to plot...

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Transient elastohydrodynamic squeeze film interaction

Hi COMSOL geniuses, I am trying to do exactly this with the Fluid Structure Interaction Module. www.comsol.com/showroom/documentation/model/14109/ I am running a 2D axis symmetric simulation and would...

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Using integration coupling variables

Dear all and Ivar Kjelberg, I used to integration coupling variable--->Point variables in order to derive integration velocity (u) and I got displacement (dr) in results for the case of 2D. But...

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Very high displacements shown in resonating MEMS devices

Hi, I have been modelling several structures of MEMS resonators and when I do the eigenfrequency analysis, I am getting displacements of the order of 1 m while the size of the structures is of the...

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Data export to text in 3.5a

Hello all, Could you kindly tell me how to - 1) export data from a Cross section plot to text file? 2) How to plot two sets of data along the same plot? Thanking in advance.

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how can i print pdf doc

Hello using my spare time to start learning 4.0, I ran into a basic and unexpected difficulty: I tried to print portion of the pdf doc for off screen reading.. [ I have the 3.5 book but 4.0, as an...

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Photonic crystal fiber

I am trying to model a photonic crystal fiber with liquid crystal filled holes.. I am a starter and it would be really helpful if any one can help me regarding the resources from where i can learn the...

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Diffusion problem with sharp edge

Dear all, Using the 2D general PDE form within COMSOL, I'm trying to solve four coupled differenial equations, in order to obtain the velocity profile of an magnetohydrodynamic flow. One PDE for the...

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Distribution of concentration of species that depends on velocity field

I have set-up a simple rectangular geometry that consists of a rectangle, an inlet and an outlet. As a flow-medium I use air. Next, I have solved for the stationary velocity field, using the...

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COMSOL 4.2a Sloshing in a water Tank

Hi, I just started using COMSOL. I wanted to model the sloshing in a tank of water. I used the tutorial "Sloshing tank" present in the site by modifying the geometry the density and viscosity of the...

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How to build a sqaure in 2D axis symmetric geometery

Hello I have got stuck in to very simple problem, I have a built a 2D axis symmetric circular plate to model my inductor and in addition I want to add a metal square late. I have to use to 2D axis...

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