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"segiter" ?
Hello! I need a help please. what is the parameter "segiter" in pairs contact?
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Creating geometry with loop
Dear All I am doing some calculations in Mechanics module. My problem is how to create circle with different radius R1.......Rn and do calculation for each radii in loop. Regards, A
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time information of streamline
Hi I solved a laminar flow diffusion mixing stationary problem for a simple system. In the result I plot 1000 streamlines. I need to know the mixing time for every streamline so I have to get the time...
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Induced voltage in a coil
Hi, I'm modelling an eddy current testing probe with the AC/DC module. The model is 3D, and I have a transmitter coil with an applied current and also a receiver coil with no current. I'm doing a...
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Comsol does not use all RAM available
Dear all, running Comsol on my laptop, I see that it uses only 4-5 Gb of the available 16Gb RAM, and in fact it takes a very long time for simulation of time-dependent 3D problems. I don't have any...
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Relation between the norm of a vector and its components
Hi, i'd like to know the relation between the quantities normJ and the components of the vector J (Jr, Jphi, Jz). I have simulated a coil group domain driven by a current of 10A. The components Jr and...
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AC/DC Module Multiturn 1/4 , 1/2 symmetric geometery
I build a 3D model of my inductor in AC/DC module using multiturn coil domain but it took too much computational time that even 16GB of RAM was not sufficient. So Edgar suggested to use 1/2 or 1/4...
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3D Symmetry of Model
Good afternoon all, I am modelling two electrodes (tips facing each other) and the electric field between them. There are two Z-axis layers to each of the electrodes, measured in nanometers, whereas...
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Changed environment from air to water doesn't alter electric field
Good afternoon, I have two electrodes set apart several microns, with their voltages set to p/m 5 V, and I'm measuring the electric field norm between the two tips. I want to see what would happen to...
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How to set up multiple input powers for a single port?
Hello everyone, I'm new to COMSOL. I got a question that might be quite easy for an experienced user. Could I enter multiple input powers at a sinlge port in RF module? For example, I only created a...
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volumetric shrinkage
Dear all, I have a question regarding the setting of initial volumetric shrinkage rate of a geometry. I want to simulate the polymerization process, during which volumetric shrinkage happens when...
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DAE is structurally inconsistent - Induced current in coil
Hello, I am just starting to use COMSOL (4.3b) and I have encountered a problem while modelling. I am modelling two identical multi- turn coils where from one is excited by sinusoidal voltage source...
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weird deformation of ultra thin plate under thermal expansion
Hi, everyone, I am using the structural mechanical module to simulate the deformation of a ultra thin plate under the temperature change. the plate size is: length 100mm, width 5mm, height 0.1mm, the...
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How to extrude the polygon?
Greetings I want to get the solid object like at the attached picture (top view). To do this I have created a polygon (type - closed curve, data source - table). Now I am want to extrude this polygon...
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where is the icon to add heat transfer with Phase change
I was going through one tutorial on heat transfer through phase change. In the menu under heat transfer in fluids i could not find heat transfer with phase change? Is it related to the version.
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Comsol does not finish the calculation even though convergence criteria is...
Hi, I have a rather strange problem with COMOL and hope that anyone can help me. I am trying to solve a "free and porous media flow" on a 3d geometry. The calculation is not converging very well but it...
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Problem with interpolation function and variable
Hi ! I'm a beginner in COMSOL 4.2a and I'm trying to simulate a model using the Microwave Heating interface. I have to consider the temperature dependance for the thermal conductivity and the...
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Anisotropic Diffusion
Hi, I have a 2D geometry in which I want to define anisotropic diffusion. When I select this option in the menu and solve the problem I get weird results. When I check again the options, 'anisotropic...
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Setting the permittivity of particles for dielectrophoretic force in Particle...
Hello, I encountered a problem while setting up fluid model with DEP force. Direction of DEP force is dependent on the Claussius-Mossoti factor, i.e. complex permittivity of the particles and the...
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Cutting a simple geometry in half
I'm trying to cut a relatively simple 3D geometry in half. My approach is to first partition the geometry using a work-plane and then delete the entities that I don't want. Unfortunately, some parts of...
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