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change the numerical values for the physical quantities
Hello COMSOL community :) I am new to COMSOL multiphysics program , i am trying to build a simulation of a cantilever in the mm length scale. I am using Magnetic fields (mf) , Electric currents (ec)...
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Ultrasonic
Excuse me, where can I find this model? "Ultrasonic Beam Steering in Isotropic Media"."Finite element models for the solution of underwater acoustics problems" This from the annual meeting of the...
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Is there a user guide manual for geometry modeling?
Hi, is there a user guide manual for geometry modeling? The example of the "How to geometry modeling" in the introduction manual of comsol multiphysics is simple and not enough.
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Numerical Derivative is Jagged
Hello, I'm modeling the unsteady state diffusion of a protein out of a hollow cylinder. Two plots I'm interested in are the cumulative mass release and the release rate. I obtained the former by...
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COMSOL version 4.4 floating potential boundary condition missing
Hi I'm running an electric currents physics study and I want to apply a floating potential boundary condition. The version 4.3 manual says it exists but I can't find it in version 4.4. What's going on?...
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Urgent problem on 3d geometry meshing(model uploaded)
Hi! I have using Comsol to draw a complex geometry as shown in the attachment, but it always has the error message: fail to insert point. And each time I refine the mesh, the insert point location...
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Symmetry for "Electric Currents (ec)"
Hi All, I have a symmetric model using "Electric Currents (ec)", so I am wondering if there is a symmetry boundary condition in Electric Currents like other physics? (I tried right-clicked on the...
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Stop condition function of solver configurations
Can anyone tell me what stop condition is (in Solver configurations> Solution 1> Time-Dependent solver 1> Stop condition)? and why it is not precise! I checked the Single Particle Model of a...
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Current Source and Violation of Current Conservation
Hi I'm using the electric currents interface. My model uses the "current source" feature and the solution COMSOL gives clearly violates current conservation. Has anyone else experienced this? And does...
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DC discharge modelling query
Hello I am modelling a DC discharge in between 2 electrodes which are positioned asymmetrically. I am making use of the example model in comsol library (positive column-2d). Both models are attached in...
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Modelling a cylindrical and ring magnet as well as finding the force between...
Hello, I'm a student trying to learn Comsol, specifically how to model magnetic fields. Currently I am trying to simulate the magnetic fields of a cylinder magnet with a ring magnet around it. I am...
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Taking derivative along the radial line....
Hi, I am working on the fault diagnosis of the substation grounding grid. I want to calculate the derivative of magnetic flux density along the radial line...Could anyone help how to take this...
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Modelling the 3D whole cell biosensor
Hi friends, I have been trying to learn the COMSOL to do the modelling for whole cell biochips. I have this problem which involves reaction- diffusion equation. So basically my chip is an electrode and...
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Modelling of subsidence in an Underground Coal Gasification
I am currently working on the effects of underground coal gasification on the nearby strata. I have been trying to simulate the same using COMSOL. I made a model consisting of a host rock (1000m x...
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Moving Mesh with Solid Mechanics and Electrostatics
Hi, I am trying to model a capacitive force sensor in COMSOL using solid mechanics and electrostatics physics. The model consists of a nylon spring between 2 silicon capacitor plates that experience a...
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Surface Recombination- Solar Cell Electrical Simulation
Hello everyone, My question is more of a conceptual one rather than a technical problem. I'm quite new to solar cells and i'm trying to add a surface recombination model to my 2D thin film(10um) solar...
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How can I use the variables in solid mechanics module as an input without...
Hi, Recently, I want to consider the pressure induced temperature increase in solid mechanics module. This temperature will cause the thermal expansion. So in the thermal expansion part, the...
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Glass Blowing on a Wafer Level
Dear all, I am pretty new in doing material deformation problem. Here, some cylindrical cavities are etched in the silicon wafer and a borosilicate glasswafer (Pyrex 7740) is anodically bonded to the...
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problem in simulating insulator
hi experts i have modeled a 3D 400 kV 25-disc insulator. due to computational problems, i made a 2D model from 3D model. however, the results are not satisfying. all electric potential is across the...
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Temperature at outlet for non-isothermal laminar flow in circular tube
I am examining a non-isothermal laminar flow in circular tube in COMSOL where the heat transfer fluid in the tube is heated as is passes the tube. Since the flow is laminar a velocity profile will...
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