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Skip unsolvable parameters in parametric sweep?
General question. I run a parametric sweep and occasionally one of the parameters causes a simulation that doesn't converge. e.g. the parameters are param = 1, 2, 3, 4, 5 meters and this simulation...
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How to deal with meshing for the thin bodies
Hi All, I am dealing with some very thin bodies, let's say, the thickness is 2mm, and width is 1000mm. I encounter difficulity to mesh these thin bodies. Do anyone have some suggestions? Thanks.
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How can I find eigenmodes propagating in given direction?
Hi! I have a general question about eigenmode problem in RF module. How can i find only eigenmodes propagating in given direction? For example, let's consider an infinite number of parallel cylinders...
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Change the YOUNG’s modulus
I'm running this coupled heat transfer-structural model .The analysis is time dependent. In my model ,as the temperature rising, the metal has deformed (such as swelled).But in reality,the metal could...
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How to define the zero potential at infinity boundary in electrostatisc of...
Hi, all I am not very familiar with COMSOL, just begin to learn, Looking forward to your help to address the issue "How to define the zero potential at infinity boundary in electrostatisc of ADDC...
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contact plate element
Hi I have a problem how to model the contact between two plates en 2D, I need to know the conditions of contact between these plates (friction- sliding) these plates are modeling by their midlin plan,...
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Problem: Cylinder appears to be block
I am quite new to this program and I tried to do create a 3D circular duct. I selected Cylinder and chose a radius of 0.004 m. In case of a short height compared to the radius, the cylinder keeps its...
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got problem with my simulation on nano scale particles
I would like to simulate the magnetic force on an iron particle due to an external magnetic field. The magnetic field is generated by a wire, conducted with steady current. The wire is about 30um in...
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Dependent variable definition
Dear all, I am having trouble finding which variables the solver is solving for. I know that I can see all the variables if I activate the equation view. However, out of all these I am not sure which...
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Can I pause the calculation and check the intermedia result?
Hi All, Can I pause the calculaiton of COMSOL and check the intermedia result? I would like to check if the intermedia result is reasonable or not. I don't want to only depend on the convergence plot....
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Can I pause the calculation and check the intermediate result?
Hi All, Can I pause the calculaiton of COMSOL and check the intermediate result? I would like to check if the intermediate result is reasonable or not. I don't want to only depend on the convergence...
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why COMSOL is solving so slowly
Hi All, I am running a case with radiation heat transfer. The 3D geometry is quite simple. Number of degrees of freedom solved for: 56826 (plus 39748 internal DOFs), and element number is around 24K. I...
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visualization of results with hiding, volume works surface not
Dear, If I want to do a visualization of the results, I need just a part of the total structure to be plotted. Therefore I make a view and hide the parts which must not be visable. When I enter a...
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Flow of fluid over an obstacle
Hi. I am very new to comsol software. I have been trying to simulate the fluid flow in a microchannel. I have designed the channel in workplane and extruded it to 50um to get the 3d structure. In the...
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please help me how to eliminate the perspective effect .... how do you...
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Acoustic Band Structure of Metamaterials
Hi folks, I have been trying to find the band structure of an acoustic metamaterial. I have been attempting to adapt the "Bandgap analysis of Photonic Crystal" tutorial given for COMSOL 3.5a to 4.3. I...
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Skip unsolvable parameters in parametric sweep?
General question. I run a parametric sweep and occasionally one of the parameters causes a simulation that doesn't converge. e.g. the parameters are param = 1, 2, 3, 4, 5 meters and this simulation...
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frequency domain using reduced basis (modal)
Hi all, I'm trying to make a frequency sweep on a (big) model of an acoustic cavity, with specified surface impedance as boundary conditions. If I use the "Frequency domain" study, everything goes...
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Modelling a 3D coil geometry for mechanical simulations
Hi all, I am doing some research on coils' mechanical properties under Joule heating. I am having problems creating models for coils with a cross-section that is not circular. See the attached image...
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Specify inflow
Hi everyone! I'm dueling with a problem and I'm a very recent user of COMSOL so probably this is an easy thing but not that simple for me. So, I'm trying to simulate the flow of a specific amount of...
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