Transport of concentrated species, Membrane gas separation
I've attached simplified model describing transport of the one component through membrane. I've made it simple to make you catch a problem easily. In my advanced model I'm using Laminar Flow physics...
View ArticlePort Phase
Hi all, I have a question about the port phase in rf module. I noticed that the software accepts 'i' as an argument for the field "port phase". what does that do? if I'im using multiple ports what is...
View ArticleElectromechanics in COMSOL
Hi, I am a student and I have just started using COMSOL. I would like to find out the displacement of a cantilever beam (2-DIMENSIONAL) due to electrostatic force created when 10V of voltage is applied...
View ArticleHelp in COMSOL (LED)
Hi, New to COMSOL here. I am trying to simulate the extraction efficiency of different LED casings (the encapsulation) in COMSOL. Currently I have tried three different geometries: cone, pyramid, and a...
View Articleexpression for analytic function for ferro-fluid
In "magnetic drug" problem, if i actually use the ferro-fluid instead of taking it's mass fraction as 0.1, what would be the expression for analytic function? According to my understanding, we don't...
View ArticleStep index fiber
Hi, In the simulation of step-index fiber if i place a particle beside the core and want to evaluate a line integration of the following equation ----------------...
View ArticleAssigning material (iron, air or...) to the permanent magnet domains in...
Hi, I am modeling a generator in which I have used relative velocity of permanent magnets and coils to generate emf. I have successfully applied magnet properties (magnetization) in the study using a...
View Articleslab-waveguide simulation / scattering losses
Hello, I'm attempting to simulate a simple slab waveguide (see attached). The waveguide has a core of n=1.5 surrounded by air (n=1) above and below. This design is surrounded by PML rectangles. The...
View Article2D coplanar waveguide Port Modeling
Hello everyone, I have a very simple 2 D model of the crossection of a coplanar waveguide (substrate in an air box, at the boundary between substrate and air I have lines for the metallization). I want...
View ArticleWaveguide amplitude errors, scattering boundary condition
Hello everyone! I am modeling a waveguide with the purpose of verification, but I am getting high errors in amplitude when the length of the waveguide is not a multiple of the wavelength of the...
View Articleimpose a local young's modulus on many subdomains
hi everybody i want to make a script (matlab) to impose a local young's modulus on many subdomains (attached image of my subdomain) someone have any idea how to make it ? thank you very much
View ArticleSimulation of Stirling Engine
Hello everybody I'm currently trying to simulate the fluid flow in a stirling engine (beta) which I've built from the following video:www.youtube.com/watch?v=X2qssmxA82U You should try building it;-)...
View ArticleUndefined value found // Hyperelastic parameters
Here we go again: When it comes to solving im getting anther error wich is quite frustrating. It says: Undefined value found. Detail: Undefined value found in. The equation-residial-vektor. There are...
View ArticleSet pressure and mass flux on a internal boundary.
Hello, I need to set an specific pressure and a mass flux between two domains on a internal boundary condition. There is any way to do this? I would appreciate if someone could help me. Thanks
View ArticleSet pressure and mass flux on a internal boundary.
Hello, I need to set an specific pressure and a mass flux between two domains on a internal boundary condition. There is any way to do this? I would appreciate if someone could help me. Thanks
View ArticleStationary / time dependent solution differs
Hello everyone, my model is a U-shaped pipe in a concrete block. Cold water (1°C) flows through the pipe and the warmer concrete (11°C) surrounding it warms up the water inside the pipe. I used the...
View ArticleAC Joule Heating question
I'm currently on a trial license trying to evaluate this product for my company. I have here an assembly of 3 connectors. One end is given a terminal condition (with 2000 or 3000 amps), the other is...
View Articlemodel coupling
Dear comsol users, I am a new user of comsol and I am building a 3d model with two physics: laminar flow and thin film-shell. I am trying to set the outlet pressure of thin-film flow as the inlet...
View ArticleHeat equation in cylindrical coordinate
Hi Does any one know how I can use cylindrical coordinate in 2D (r &theta) in heat trasnfer module for the heat equation? Basically I want to monitor conduction in radial direction only. Thanks
View ArticleModélisation des écoulements à travers un barrage en terre
SVP , est ce qu'il y a quelqu'un qui peut m'aider à modéliser les écoulements dans un barrage en terre homogène sous COMSOL multiphysics. Ci attaché le model Le niveau de l'eau se trouve à 13 m de...
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