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Time Step Function
I am interested in applying a heat source when the temperature reaches a certain value, then I want to have the source on for a couple of seconds, and then off again. Something like a rectangular step...
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Inter-diffusion between two pure metal
Hallo, I am pretty new in COMSOL and trying to simulate inter-diffusion between two pure metal (Cu and Sn). I made a simple model in comsol but not sure i considered the right initial condition. I...
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Heat Flow in simple pipe with water
Hello, I'm really new to heat flow computation and I have no Idea how to calculate time and distance of water flowing in pipe when water temperature will stay constans. Model: pipe 50 m long, 0.04mm...
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COMSOLPIN photodiode example simulation (updated)
Hi, i'm trying to do a photodiode simulation based on the gaas PIN diode example from comsol. In this example, the electromagnetic wave is excited from port1 and port 2 at the semiconductor boundary,...
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COMSOL 5.2 gets stuck after some time
From almost two weeks I am facing this problem that whenever I run a simulation that requires long processing time, I find that the program stops responding. I just get a "waiting" cursor and a (Not...
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Unrealistic Particle Behavior
Hi, I am simulating a 2-D Model, where I want to analyze the convection effect of a heater which is heating up the air above. I want to see the effect of particles, that are distributed in the air. I...
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Wavefront simulation
Hello all, I'm quite new to COMSOL and I'm trying to simulate the effect of curved surface (which I change using the structural mechanics module) on the reflection of a plane wave. I can't find a way...
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Open Boundary
Hi everyone, I have a model with two domains one of which is laminar flow and another is porous media domain (Darcy's law). The fluid stream percolates from the laminar flow domain into the Darcy law...
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Eddy_Currents_In_PM
Dear all COMSOL experts, I am simulating a Synchronous Surface Mounted Permanent Magnet Machine. My aim is to estimate the eddy currents within the permanent magnets placed on the rotor surface, since...
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Loop in Comsol without using MAtlab
Hi guys ! I assume I have 2 physics, how can I set up only in Comsol to make sure that I get as I expect : A-->B-->A-->B-->A--> ... Fully couple can not do that, so really need help from...
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Cummulative Sum in Comsol
Is it possible to achieve (within comsol) a cumulative sum of a time varying data. Can I use SUM in Comsol to implement that ? Any suggestion will be appreciated ! Best regards, N. N
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Convergence problem of BiCGStab
Hello everyone, I try to simulate silicon waveguide in SOI. I have convergence problem of BiCGStab. It is odd because in the first iteration, the error is about 7 but after second and further...
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Time derivative only allowed with respect to mesh time
Hi everyone, My model contains Darcy's Law under Porous Media and it runs well. But if I add " Deformed Geometry" Physic under mathematics to compute Time-dependent study, it occurs "Time derivative...
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Parametric solver does not support parameters in geometry or mesh.
Hello guys, When I change the size of a geometry with a parameter, parametric don't work as I wish. And there is a warning:Parametric solver does not support parameters in geometry or mesh. is there...
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Error: "Attempt to evaluate negative power of zero."
I'm building a model using the Reaching Flow in Porous Media in a 2D axis-symmetric component, and my goal is to remove some of the dilute species from the system as a function of concentration and...
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Error Index:2, Size 2, Feature: Stationary Solver 1
Hi I have a Frequency Domain study looking at the dynamic response of an un-deformed structure immersed in water. I am using Solid Mechanics, Pressure Acoustics - Frequency Domain (acpr) and...
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Big difference between analytical solution and COMSOL simulation (line...
I have an analytical formula for potential distribution (by image charge method) when the line charge is floating on grounded plane, which is, V=P/(2*pi*eps)*ln (ri/r) Also I did numerical simulation...
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magnetic field around a current carrying wire
Hi all, Just a beginner's level very simple question: How to simulate magnetic field around a current carrying straight conductor? -Should we use a combination of electric currents/electric circuits...
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Adding an extra dimension to 1-D battery model
Hi all, I am working on modeling and simulation of Li-ion battery. My model is pseudo-2-dimensional one. So I need an extra dimension to consider diffusion equation in solid phase of porous electrode...
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Access into the time step in time-dependent solver
Hi everyone, Is it possible to access into the time step loop in Time-Dependent Study? For example, At t=0[s], solve A At t=0.1[s] Solve B,C,D,....... At t= 0.2[s] Solve A At t=0.3[s] Sove B,C,D,........
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