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Continuity equation and momentum equation

Hi.. i'm new in comsol.. i'm doing 2 d simualation of wind passes through the hill by comsol multiphysics 4.2. May i know, did i need to specify momentum and continuity equation (ux+vy=0 and...

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how did I acquire the position of particles in particle tracing module

I have a confusion which is to get the data of particles when I use matlab linking with comsol. But the function of mpheval is error. For instance, qx=mpheval(model,{'qx'},'dataset','part1','t',0);...

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Error from the Modal Frequency Response analysis

Dear all, I am trying the Modal Frequency Response analysis tutorial with the elbow bracket example in the Model Library. However, if I try to run the tutorial model file for modal frequency response...

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sine excitation

Hi all. I am performing a 2D frequency analysis in the Structural Mechanics Module. I want to apply a prescribed displacement on the left boundary and to see which waves propagate inside the medium....

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how to set up the ions in water dans my nano-fluidics

hi everyone, I'm trying to simulate the nanofluidics covered by a layer of SiO2 of which the thickness is about 50nm. In the nanofluidicsm there is water or other liquid. First of all, I set the...

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load model

hi it's possible to load a model create in the workspace of matlab (see figure) ? thanks best regards

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Magnetophoretic Separation

Hello, I'm trying to simulate magnetophoretic separation in a cylindrical cavity filled with water. Something in my simulation is still missing or wrong, I would be grateful if someone could help! I...

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Joule heating in a conductor

I'd like to model a cable covered with a insulation. The current of 10A is flowing through the cable. I do not have any parts grounded. I used the "Terminal" option as suggested in the COMSOL example...

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flow rule in plasticity

I can not find how to define flow rule in plasticity module. Can user define flow rule in comsol? How to deal flow rule in comsol? Associated or Nonassociated? Anyone can give some information about...

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how to plot velocity profile within a pipe elbow

Hi, Can anyone please guide me as to how to do I plot the velocity profile across the geometry which consists of two pipes and a 90 degree bend in between them. I have attached my model for reference...

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Integrating two RF application modes

I want to simulate a 3D waveguide geometry using 3D transient wave propagation mode of RF module. The input field at one of the far cross-sections is an eigen-mode of the waveguide. I create a...

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Meshing of boundary layers wont work

I am trying to mesh (and, eventually, compute) a model of a rectangular duct connected to a circular hole, where the duct and the lower part of the hole are filled with water, the upper part of the...

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"Internal error in boundary respecting." and "Out of memory during assembly."

Dear All I have two errors in my microfluidic models about "Internal error in boundary respecting." and "Out of memory during assembly.". At first I tried to simulate the flow of the overall 3D...

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Joules heating.

Hello. I have made a model of Primary terminal of a Transformer carrying a current of 300 A . I wanted to find out the heating in the Top chamber of the transformer where the terminal is connected....

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Problems with boundary layer meshing

I am trying to mesh a k-epsilon model and cannot generate a boundary layer mesh. My model has a very narrow region and I expect that that is the problem area. The error I get most often is: Could not...

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Simulation of terahertz radiation from nano-antenna

I am new to COMSOL and I wish to simulate the radiation ( Electric field) in terahertz domain from a nano-antenna structure which consists of two electrodes separated by a 25um gap. The electrodes have...

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find the coordinates of a point in which the magnitude of derived variable at...

Hello, I am working on a 2D transient problem. I have the results and want to post processing them. I want to plot my results like this: Detect the minimum of a derived variable all over the domain at...

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Packed bed mean field model

Hi, I am trying to solve the time-dependent concentration profile in a packed bed using the mean field theory rather than the whole CFD definition of the problem. The mass giving rise to the...

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LiveLink for CAD - can it handle multiple parts?

Hi All, Can LiveLink for various CAD products handle multiple parts or assemblies? All the documentation/videos I have seen on LiveLink show it being used with a single part. Although using a CAD...

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Problem with heat transfert in lava

Hello everyone, I posted a topic here because I encounter a problem with Comsol. Indeed, I try to modelize a lava flow, but I have a problem to fix the temperature of middle flow as you can see on this...

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