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Magnetically Sprung Electromagnetic Generator
Hi guys, I have built a magnetically sprung electromagnetic generator for harvesting energy from machine vibration. Its basically three magnets in a tube, one fixed at either end and one floating in...
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Convergence of time dependent and linear solver
Hello All, I am trying a model in which electrodes can electrically stimulate certain layers having different conductivity (input being a biphasic pulse train). Using time dependent study, the model is...
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Matlab assign geometry to materials
I desperatly try to run matlab script to simulate a 2d axissymmetric simulation. The geometry objects and the materials were easily created. The problem is, that I struggle to assign the geometry to...
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Why is the gradient of the voltage potential field not equal to the electric...
Hi, I have been working on a 3D model of a resistive current sensor, and I am trying to verify the high frequency (50-500Mhz) response. Essentially, i want to make sure that at a fixed current...
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Moving Mesh - Thermal stress coupling
Hello to all, I need to perform an RF frequency domain analysis on a waveguide which has been previously deformed by a Thermal Stress stationary analysis. In order to do this, I need to calculate the...
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Ionization of air.
Hello. I have a model that comprises a container filled with air. From the outside there are two coils number of turns 1e6 supply current is 1e3 A in the container are two electrodes voltage + - + e7 V...
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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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Convergence of time dependent and linear solver
Hello All, I am trying a model in which electrodes can electrically stimulate certain layers having different conductivity (input being a biphasic pulse train). Using time dependent study, the model is...
View ArticleClik here to view.
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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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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How to set boundaries as continuity ?
I want set the boundary as a continuity but I don't know how? I know that in Comsol by default the boundaries are define as continuity and it follow this equation: n.j=0 but I want change it to n(j1-...
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Store data at certain time intervals
How do I set up my model so the data are not stored at every time step, but at certain intervals. That way I don't end up with huge file, and my plot files for exporting are small as well. Thanks in...
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Magnetically Sprung Electromagnetic Generator
Hi guys, I have built a magnetically sprung electromagnetic generator for harvesting energy from machine vibration. Its basically three magnets in a tube, one fixed at either end and one floating in...
View ArticleClik here to view.
applying a periodic biphasic square waveform to a surface electrode
Dear friends, I want to apply an AC voltage/Current to a surface electrode placed on the human skin. I need a periodic waveform with unequal on and off time. How can I apply this stimulation pulse to a...
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Matlab assign geometry to materials
I desperatly try to run matlab script to simulate a 2d axissymmetric simulation. The geometry objects and the materials were easily created. The problem is, that I struggle to assign the geometry to...
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