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Error message
Hello everyone, I am computing the derivative of flux density over the earth surface as grounding grid is buried inside. But the it gives an error message "Failed to find a solution. The relative error...
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What's the axial boundary condition?
Dear all, I've been using 2D axisymmetric Electromagnetic module. On the axis there's the default axial boundary condition. It's very convenient to use, but there's no way to know what conditions it...
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Floating Potential incomplete description?
I'm a bit confused about the description of the Floating Potential boundary condition in the Electric Currents mode. It says that the integral of the current into the surface is 0 (or another...
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How to export the data of far-field pattern
Hi! I am a newbie to COMSOL and I just managed to compute the scattering of electromagnetic wave by a PEC ellipsoid. I exported the data of far-field pattern to a csv file. As far as I know, the...
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Modeling of Melting-Hysteresis in Phase Change Materials
Hi! I tryed to model the behaviour of a phase change material under changing temperatures. I used a enthalpy method to do this. I have Information about the enthalpy at certain temperatures out of a...
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how to plot fraction of volume from 3D model?
Hi, How is it possible to show volume plot for a special section of a 3D domain? My 3D whole domain starts from x= [90-700(m)] y=[50-500(m)] z=[-10-2(m)] But I want to show volume which is...
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Using Parametric Extrusion by combining different solutions.
Hi, I ran different studies in the same model, each one for a different range of temperatures. I would like to create a parametric extrusion 2D of a cross section for one temperature from each...
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Comsol with Abaqus Solver
Hello, I'm modeling a laminar flow with particle trajectories in a microchannel. Is it possible to write an input file after complete every detail about modeling to solve it with Abaqus Solver? Thanks.
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Problem with heat-transfer test case
Hullo everybody. I have a problem with a simple heat transfer test case; please find attached the input file (for version 4.3a). It is a 2D axy-symmetric problem, with a torus representing a coil...
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Dean Flow Modelling in MicroChannels
Hi, I'm trying to model Dean Flow in a Spiral Microchannel for further application of Passive Cell Separation. Since Dean Flow is observed basically on the plane which is perpendicular to the...
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COMSOL 5.0 compatible with MAC OS X El Captain 10.11?
I want to upgrade my Mac to OS X 10.11 (El Capitán). I would like to know if COMSOL is compatible with this OS.
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How to plot emw fase?
Hi everyone, I reached a good result for a hertzian dipole simulation and plotted the components along a 3D line, and I figured out that the results' graph shows the real part of the component. I need...
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Octahedron creation
I need to create by the Comsol geometry builder, an octaedron having a face lying on a plane. I created the octaedron merging two pyramids, but i'm not able to rotate it in such a way that a face lies...
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Setting If statement in COMSOL ODE
Hi, I am trying to solve an ODE in COMSOL (time-dependent) but i want the ode to be initiated only if the temperature is below certain value, say 272K. Is it possible to implement this in comsol? Thanks
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how to set a threshold value
Hi everyone! I am working on Fiber Tracks stimulation modeling. I need to set a threshold value on fibers so that when the electric field reaches to a certain value, the exposed fibers get activated....
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Open Boundary Condition in Transport of Dilute Species
Hi all, I have a question about the open boundary in Transport of Dilute Species physics. I have a microchannel model with fluid flow going from A to B while the solute going from B to A due to...
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Conduction Heat Transfer help
Hello, I am in need of a little assistance. I'm conducting my final year project at university on waste heat recovery and I'm trying to develop a simple Comsol model to aid my work, however I am having...
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Construction in 3D
Hi, I have one maybe trivial problem.. How can I curve helix around any construction or angle in 3D model? In attached picture it is around siple "C" solid (300°) for instance. Or is this specific case...
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What is inverted mesh element ?
Hi all While running a model i got a warning message stating that "there is an inverted mesh element at x,y,z (coordinates are given)". I have an queries that what is this inverted mesh element? And if...
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Developing a 3D Undulating Geometric Surface Using Comsol Multiphysics
I have been trying to develop a 3-dimensional undulating surface in the x-direction. Find attached a figure explaining my geometry. If someone have any idea on how to develop this geometry. I will be...
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