constraining dependent variable
Good day: I am trying to find the most effective method of implementing a constraint on a dependent variable. I am solving a classical diffusion equation (using Equation based modeling)of concentration...
View Articlesimulation problem
Hello, I'm running a simulation for 60 ms but my simulation is not running after 10.85 ms. Could anyone help? Regards, Ganesh
View ArticleToneburst signal
hello, How could I create a toneburst exitation signal or a simple sinus exitation wave signal in comsol 3.5a? Thanks
View ArticleLimit dependent Variables
Hey COMSOL-Experts, I want to limit the dependent variable s for an intervall ( 0<s<1). How do I do this in COMSOL 4.1? Thanks for help. Best regards David
View Articleconstraining dependent variable
Good day: I am trying to find the most effective method of implementing a constraint on a dependent variable. I am solving a classical diffusion equation (using Equation based modeling)of concentration...
View ArticleJoin two solution
Hello everyone, I have two transient solution for the same model, one from 0 to 10000 years and one from 10000 to 20000 years. there is a way to join the two solution into one from 0 to 20000 years?...
View ArticleInertial Forces Representation in a Microfluidics Module
Hello, I am working on a simulation of a microfluidic system that involves both the effect of dean flow and inertial (lift) forces on particles travelling inside a microchannel. To my knowledge, COMSOL...
View ArticleMaterial removal
I am trying to simulate material removal in Comsol. My aim is that I want the material removal in the material after the temperature goes beyond its melting temperature. I have been trying to change...
View ArticleSurface to Surface Radiation Heat Transfer coupled with Electric Currents Module
I am trying to model heat generated from a coil within a volume of air. Currently, I am getting an error saying that I have faulty initial conditions. The coil has 10.6V running through it, which...
View ArticleThree phase flow problem
My work is to create a chanel design to sort the droplets,for this I'm using water and oil to create droplet and air to sort the droplet to the other channel. I need to control (open) my inlet at...
View ArticleCombine two solutions
Hey all, I have two consecutive time dependent studies and two solutions sol1 and sol2. In postprocessing I would now like to "stitch" these two solutions together, so that instead of having to deal...
View ArticleFluid Flow and Heat Transfer in Fluid/Solid - problems with convergence
Hello everyone! I am quite new to COMSOL and I am currently working on the 3D geometry I hereby attach. The geometry is built in COMSOL Multiphysics 5.0. The model is referring to a 23 meters high...
View ArticleReduced order model.
I wanted to know that how the COMSOL solves PDEs. Does it solve by FEM? Does it change the PDE to ODE to reduce the model order? Thanks, Sun
View ArticleStationary study with time
Hi everyone, I am trying to study diffusion process in sessile droplet by using Transport in Diluted Species under steady state condition. My question is that if I want to study the behaviour of...
View ArticleValues of variables not solved for: ...
Hi all! I have two physics, both of them are time-dependet study. My question: If I want to couple these two physics together , there are two options: Values of variables not solved for:...
View ArticleReduce Degree of Freedom antenna array
Hello, I am using RF module and have a created a model of antenna array, with which I would like to observe scattering of EM waves when penetrating dielectric material (permittivity 50-70) The antenna...
View Articlesolver questions for multiphysics problem with time dependency
Hi everyone! I am running the simulations with a fully coupled solver. The physics i use are moving mesh and laminar 2phase flow (phase field). I have a couple of doubts regarding and its listed below:...
View ArticleEigenvalue Solver Warning
Hello, I am running the eigenfrequency study in the Acoustics module, and received a warning in Comsol that I have previously not encountered:"Extra interior eigenvalue found. Decrease the size of the...
View ArticleCoil Group Box under Multi-Turn Coil
Hello, In axial-symmetric geometry I am simulating magnetic fields created from multiple multi-layer solenoids stacked on top of each other. I am using the Multi-Turn Coil function, and had a question...
View ArticleCoil Group Box under Multi-Turn Coil
Hello, In axial-symmetric geometry I am simulating magnetic fields created from multiple multi-layer solenoids stacked on top of each other. I am using the Multi-Turn Coil function, and had a question...
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