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Using a Gaussian Pulse
Hi everyone, I'm actuallay working on a modeling of a laser pulse which is heating a front of a material in order to determinate the diffusivity, my current issue is that i would like to model my heat...
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Nusselt number calculation in comsol 4.2
Dear All, I simulated a simple laminar flow of a liquid metal inside a 1 inch tube of 0.5m length with a constant heat flux acting at its wall in comsol 4.2. I used both the mesh options i.e. the...
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State Space Export
Hi , i have build a simple cantilever beam model using time depented model. after defining the points of forces and parameters, i want to export the model to matlb (State Space Matrices) so i could...
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[SOLVED] Comsol v4.3.0.233 crashes
Hi, Today, after restarting my machine I opened several applications and I was logged out from my desktop session. After checking one by one, I get to see it was comsol that was giving problems. I've...
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sphere in elastic medium
Hi All. I'm trying to impose some pressure on a spherical boundary (it is a very simple model) but I don't understand why Comsol is telling there is something wrong with it! I have added the elastic...
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Diffusion through Teslin Paper
I am having trouble creating a model. I am trying to create a model that can determine whether or not chemical solutions will diffuse through a porous Teslin paper test strip. I want the chemicals to...
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How to define variable regard to time dependent steps?
Hello All I'm running a time dependent AC/DC model, The conductivity of material must be changed regards to voltage differences on two coordinate in each step . I wonder How can I define a variable or...
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Microweave frequency function with temperature
Hi I am studying an microwave problem in frequency domain, where the frequency of the waveguide problem needs to change during the simulation. I successufly, made one simulation by definying a...
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import mesh with the edited *.mphtxt file
Hi, everyone: I have a geometry mesh, and I knew the mesh node's coordinates: x, y, z in matlab workspace. I want to import the mesh into COMSOL , and set the point whose coordinates were knew as the...
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Microwave heating model with multiple frequencies
Hi, With the Microwave heating model, with a frequency-transient study is possible to simulate multiple frequencies in a well defined bandwidth? I have a input wave with a fixed bandwidth defined by a...
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How to plot the relative error?
I've just spent more than a whole day troubleshooting my model. However, if I could plot the relative error over the geometry, I believe it would have been solved in minutes. There was a problem...
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Multiphase Flow LS - Air Bubble in Water Cylinder - Conservative forms fails
Hello everybody and thank you in advance for any kind of help you may give, I am trying to simulate a simple kind of scenario, an air bubble in a water cylinder rising due to buoyancy force. I made my...
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Control Mesh element distribution over the surface
How is it possible to control the mesh element distribution over a surface (boundary) between two 3D domain? I know "Distribution" that is used to control the mesh element distribution over an edge in...
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Integration boundary condition that is probably of circular dependency...
I tried to model the ionic exchange in a dye-sensitized solar cell. The concentration of cations in the electrolyte follows a Boltzmann distribution: Nc = N0 * exp(-Q/kT). N0 is a constant. That is, Nc...
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3D simulations and meshing problems
Hello, I am doing some 3D simulations. I have basically some very small structures on a bigger substrate. I have to use the ignore faces operation to remove the common faces between the substrate and...
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Current not being conserved in AC/DC.
Hello all, I am having an issue with current conservation using the AC/DC module and a stationary 3D model. The model is two parallel pieces of copper and a small piece of aluminum between them. I add...
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Changing the relative repair tolerance seems not to be effective in any way
I need to define a geometry that is very awkward but it's necessary, It's a sphere with a very big radius compared with the thickness of a single layer (1000 times smaller, e.g. s/r = 1e-3, where s =...
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Is it possible to show cavitation phenomenon in liquid due to ultrasonication?
Is it possible to show cavitation phenomenon in liquid due to ultrasonication?
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acceleration due to gravity Laminar flow
I want to give acceleration due to gravity effects to fluid in Laminar pipe flow, any one know how to give,????? I have tried by applying domain volume force like 9.81*density of fluid but i am not...
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Override not-applicable boundary
Hi, This may be easy but I don't see how to do it in V4.3a. In V3.5a it was not hard. I would like to apply convective cooling at an interior boundary in my model. Currently, all the interior...
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