Modeling electrochemistry system without electrochemistry module in Comsol
I am working on electrochemistry stuff but I am using the Comsol without electrochemistry module. How can I put equation to calculate impedance for my model based on various frequency. Also, how can I...
View ArticleCould you please let me know what are the steps to follow to solve the 3D...
I'm a beginner in using COMSOL Multiphysics. I want to solve the 3D helmholtz eigenvalue with Dirichlet boundary condition using COMSOL. How to model COMSOL Multiphysics ? For example, how to compute...
View ArticleChanging the resistivity of the Silicon Material
Hello,I am fairly new to COMSOL and I am using Semiconductor physics module, I need to change the resistivity of my material Can you please let me know how to do that.Thanks very much!
View ArticleSimulating transport of diluted species with a droplet inside the domain
Hi all, I'm simulating mixing of two streams with a droplet (please see the attached image), which means that I don't want COMSOL to solve tds inside the droplet (the black circle in the image.) I've...
View ArticleSolving Linearized Euler Equation in frequency space using Weak Form PDE module
Hi,I am trying to solve the Linearized Euler Equation (LEE) in frequency space using 'Weak form PDE' module. For 1-D, uniform mean quantity assumptions, the LEE is given by:Momentum:...
View ArticleMass transport equation in moving geometry
Hi all, I have an immiscible droplet inside my mass transport domain, which means the mass transport phenomenon does not happen in the vicinity of this droplet and to the droplet. But I have mass...
View ArticleBoundary constraint
We are trying to solve FSI of a Submerged Floating Tunnel which is fixed at both ends. When i'm modelling with the pipe fixed at the Walls of the fluid domain, its not able to slove that. It always...
View ArticleWhy the torque in pm_motor graph
Dear allWhy I compute the torque of pm_motor, the data is under the axis? What makes the torque minus? The current of coils?RegardsJoey
View ArticleAC/DC Module Permanent Magnet Motor(PMM) Simulation, Time-dependent, rotating...
Dear allI am doing a simulation about pm-motor in version5.4. but I feel confused why the result of torque that it is below the coordinate. Whether should I define the coils in the motor?Also, I want...
View ArticleAdding interval from geometry toolbar
I am modelling the electrochemical impedance of a 1D li-ion battery, and would like to know how to add interval from the geometry toolbar. I am going through the tutorials by COMSOL for modelling...
View Articlehow to launch oblique gaussian beam in wave optics?
When I use the wave optics module scattered field formulation, I can select gaussian beam along either x or y direction. How can I launch a gaussian beam with arbitrary angle of incidence? (other than...
View ArticleEffect of Large Scale Difference on Mesh
Hi Everyone,I am modeling a 100 nm thick thin film on the glass substrate with size 25 mm x 25 mm x 1 mm (study: heat transfer in solids). However, when I mesh them a problem arises due to their...
View ArticleCould I use comsol to simulation the Parity-time symmetry-broken Bragg grating
Its structure consists of a layer of PMMA doped with dye molecules and a layer of metal. The last layer of silica, where PMMA is the active layer, providing a gain to the structure.
View ArticleVelocity pressure coupling in comsol
Dear all,I am a bit confused about the velocity-pressure coupling in COMSOL. The default solver sets in such a way that, for laminar case, velocity and pressure are solved in fully coupled manner. In...
View ArticleHow to set polarization for a numeric port?
Hi all,I'm a beginner in Comsol and I want to model a single mode silicon waveguide with SiO2 cladding (and something more complicated later) in 3D. I want to use numeric ports and I have to set a...
View Article(ec) Current source - time dependent study - Thoraxmodell with electrode...
Hello,I'm right now working on a project, where I had to 3D-Scan a throax model and use it for simulation of the heart dipol. The model is basically a real body sized container filled with a NaCl -...
View ArticleBias Electric Field Variation in Semiconductor due to High Light Intensity
Hello all,I am simulating a semiconductor substrate under the illumination of a high intensity light (a laser). I have two electrodes with a bias voltage of 30V sitting on top of the substrate, and the...
View ArticleHow to express the time-averaged extinction Poynting vectors ？
Extinction spectra are calculated by integrating the time-averaged extinction Poynting vectors Sext (i.e. electromagnetic power flow) over an auxiliary surface enclosing the Au NP dimer or the isoalted...
View ArticleLarge Initial Deformation of a beam
Hi, I would like to give a large initial deformation to a beam in Solid Mechanics. I have tried different constraints like initial values, prescribed displacement etc. But none of them works (when I...
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Helmholtz Coil - Contradiction Between Analytical Solution and Simulated...
Hello,First, I am new to COSMOL so I hope you can excuse whatever ignorance I may have for this tool.The COMSOL Helmholtz coil demo models a 10-turn Helmholtz coil pair with 25mA of current. The model...
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