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time dependent capacitance
Dear all I am new in COMSOL. I have a few questions related to the capacitance. 1. How to compute capacitance in time dependent study ? I couldn’t find any capacitance in the postprocessing menu in...
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Ground Boundary in Magnetic and Electric Fields ( M E F )
Hi there, I am trying to follow the example of simulating inductance as www.comsol.com/model/inductance-of-a-power-inductor-1250. But when I tried to add the boundary of ground, there is no such...
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Fluid-Structure Interaction In a Cylinder
Hi EveryBody; I recently heard about Fluid-Structure Interaction, so i want a model with this Physical module in a cylinder if it's possible. i also want to know if there is a difference between the...
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Heat transfer with time derivative heat source
Dear all, I try to model heat transfer with time derivative heat source Q=dq/dt, with q=Qm*exp(Tau/t)^(Beta) Qm, Tau, Beta are constant. Are there anyone know how write dQ/dt in COMSOL? I have tried...
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Electric field propagation through circular waveguide
Hi everyone, I have simulated a straight circular waveguide piece of 19mm diameter for TE01 mode. I have observed that Er and Ez components are zero...Only propagation through Ephi Component along...
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Boundary condition for potential in electrodeposition
Hi, I am trying to simulate electrodeposition of metal ions on a pure metal electrode, by using the Mathematics module (General form PDE). The boundary conditions for electrostatic potential are given...
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short-pulsed heat source resolution
Hi everyone! I need to model a short pulsed heat source. The heating-time is around 0.5ms. After that there is a delay time of around 0.1s until the next heating puls should occur. After that the delay...
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Piezoresistor notation
Hello, I've recently been modelling piezoresitive cantilevers using Comsol, and I need to compare the simulated data of the piezoresistor change with the experimental one. However, I do not see the...
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Time dependent study and multi-turn coils
Dear Sir or Maddam, i´m trying to investigate the resulting eddy currents in the walls of a rf shielding chamber created by magnetic coils located inside of the chamber, these coils will be excited by...
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Electric Field in a Three Phase PILC Cable Won't Solve
Hi I am brand new to comsol, and I've set up a simplified model of a PILC cable consisting of a lead sheath, three copper conductors and an insulating material. The insulator is a material that I...
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Convergence Plot and Log File in Application Builder
Hallo, I already have a Comsol Model, Now i want to build an application with this. Because i have used a segregated solver, there is “Convergence Plot” besides “Graphics” in the Model Builder and the...
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forced vibration of a cantilever beam - width effect in COMSOL and ANSYS
Dear All, I am simulating a cantilever beam with L=28mm, W=20mm, t= 0.82mm. And also another cantilever beam with L=28mm, W=2mm, t= 0.82mm. Under harmonic pressure of 6pa. First -COMSOL results in...
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Varying concentration on surface of a sphere
Hello, I'm working in COMSOL 4.3a with the Transport of Diluted Species module. I have created a simple sphere and would like to model outward flux of a certain species given an external boundary...
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Geometry issue
Dear all, I am designing an encapsulation for a chip and I need to create a flow path through it. The starting surface of the flow path is a circular surface and it should finish in a rectangular...
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Definition of von Mises stress
Hi all, I have a question about von Mises stress used in the structural mechanics. According to its definition, von Mises stress can be computed using the formula, in 2D application : σvm = sqrt ( (...
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Select boundaries inside a cube
Hi all, I use COMSOL 5. My geometry is a cube and inside of the cube there is a small sphere. To perform my model, I need to select the boundaries of the sphere. The problem is that I cannot select the...
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determine capacitance
Hi@All, I have a 3D design and would like to determine the capacitance between two electrodes. Unfortunately, I do not know exactly how I can do that in COMSOL. Thx and cya Thomas
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automatic point preparation / evaluation
Hello everyone, I would like to evaluate a large number of points automatically. I have created all points manually and group them in a selection. In the evaluation (Point Evaluation) I choose the...
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Error in view factor calculation
Hi, I am currently doing a 2D simulation in COMSOL 5.1 of a rectangular cavity enclosed by 1D surfaces. The cavity has a length of 1 m and height 0.1 m. The top and bottom surfaces are diffusive...
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Extracting data from COMSOL
Hello All I just want to know how to extract data from COMSOL and then plotting graph in EXCEL sheet. For example if I am trying to study transmittance with wavelength, then how to get the data into...
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