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Time- and Space-Dependent Current Density
Hi everyone, I would like to compute the radiated power from a distribution of current which varies in time and space. I was using the RF-module, using a 'External Current Density'. I tried the...
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The Meaning of "Voltage" in AC/DC module
Hi, I am currently working on a COMSOL microwave cavity model with a coaxial port and external circuit. The voltage source has a default voltage setting of 1(V). In the context of AC power this is an...
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Problems in 3D simulation with phase field method
Hi, everyone! I am working on droplet coalescence on superhydrophobic surface. I would like to simulate the 3D coalesce process through the "laminar two-phase flow, phase field" module. But during the...
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Defining Geometric Parameters from Imported Grid Data
Hello everyone, I would like to be able to take a grid data file that I have and create a block with width(x) and depth(y) from the x and y values of the data file. The format of the data file is as...
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Unexpected unit of input
Hi Everyone, I want to create some variables using log () ; but it gave me the message "unexpected unit of input". Although the unit of the used variable is meter. My physics is "Solid mechanics"; My...
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Heat transfer in solids coupled with Transport of diluted species
Hi, I'm trying to couple heat transfer in solids with transport of diluted species. Reaction rate R = -Ca* (A*exp(-E/RT)) I want to impose temperature constraint on this reaction. I want the reaction...
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Solution not computed error message
Please, what can cause this error "Solution 1 is not computed"?.
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Material properties using functions
hello I'm simulating a human body skin using COMSOL, the properties of the skin change depending on the applied frequency. For instance the electrical conductivity is 1.49 at 2.5 GHz while it's 15.1 at...
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Parabolic inlet velocity in 3D geometry
Hi there, I am using COMSOL to model flow through a bioreactor with a parabolic velocity profile at the inlet. In a 2D geometry, for the inlet boundary condition I selected normal inflow velocity and...
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Parametric Sweep!
Hi, The parametric sweep gave me just the last two solutions, any ideas to get all the solutions? Thanks!
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How to assign a parameter to each grid cell by COMSOL with MATLAB?
For example, in Darcy model, in order to realize heterogeneity for model, different permeability parameters which may satisfy a kind of distribution function should be assigned to each grid cell. How...
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Electrical potential distribution in electrostatics
I'm going to simulate a multiple-layer structure with charge induction after friction. The material of the central domain is aluminum in which surface charge density of its top and bottom surfaces are...
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it was found unsymmetrical matrix
hi： my model was used by a heat transfer node ,when it compute to 4%,then it was found unsymmetrical matrix and it was no convergence. Best Regards wei wei
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Save only probe measurement in parametric study
Hi everyone, I am quite new to Comsol, so maybe my question is easy to answer... I am doing a study with 3 parametric sweeps at the same time, with only one point of interest measured by a probe. My...
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How to set a certain zone to temperature const in a instant time range?
Hello, I am using comsol to solve heat conduction problems. I want to set the temperature of a certain zone to be constant. But I can only find a constant-temperature condition for boundaries, rather...
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Simulation of inverse magnetostriction (Villari effect)
Could someone please help me with simulation of inverse magnetostriction? The general ideal is to apply stress (spatially non-uniform) to a magnetostrictive pillar and calculate the resulting...
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Computing the ratio of input/output power in wave optics module
Hi, I am a beginner with COMSOL. I have made a simulation in which I have waveguide which bends. I have found the Electric field. I want to compute the bending loss by comparing the total...
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electrode for spinal cord stimulation
Hi, i'm using Comsol 5.0. and i am new. I need to make a model of two electrodes (cathode and anode) resting on a series of biological tissue (dura mater, cerebrospinal fluid and white matter, of which...
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Error in "Particle Tracing for Fluid Flows": Duplicate function name
Hi I am simulating "Particle Tracing" in a Microfluidic mixer. It has 5 Inlets and one outlet. When "Particle Tracing for Fluid Flow" number 2 and 4 are enabled together it generates this error:...
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Rotate plot by 180 degree
Hi , I am modeling for continuous casting in COMSOL following the model given on the website: www.comsol.com/model/download/...ls.heat.continuous_casting.pdf I want to rotate the plot along with the...
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