Several parameters in fixed solution is not supported
I'm receiving the above error while computing a particle tracing study. I have three studies: 1 stationary stokes flow, 2: parametric sweep (2 variables) stationary electric currents, and 3 time...
View ArticleJoint Constraint/Contact
Hi I am using multi body dynamics in comsol 5.2a to model spring-mass systems. I've set up two rigid domains connected with springs. The first spring is connected to the "wall" and mass 1, and the...
View ArticleIterative solving utilizing local variables to avoid circular variables
Hello all, I have a circular variable issue for local variables, and am interested in knowing if there is an iterative solver that can solve this issue. Ex of problem: (int1 is an interpolation table...
View ArticleProblem with periodic boundary condition
Hi, i have a problem that i don't really understand. I made some simulation of a square impedance tube to compute sound absorption coefficient. The mode works very well. when i apply a periodic...
View ArticleAcoustics Time Dependent Study from a Frequency Domain Study
Dear Community, I am solving an acoustic problem with two different frequencies from continuous wave sources and need to track their interaction at a focal area. The mesh requirement and time step...
View ArticleFluid Flow - Liquid Nitrogen
Hi everyone I'm trying to simulate cooling a solid submerged in liquid nitrogen. I've successfully simulated cooling a hot solid submerged in water using both Turbulent Bubbly Flow and Laminar Flow,...
View ArticleParameter study and using probes
Hi, I am trying to conduct a parameter study and I want to measure the pressure in my model at certain points by using probes. The problem I have in the moment is that all the probes return NaN. So, I...
View ArticleDamping of the piezoelectric material
Hi, In my numerical model involving piezoelectric transducers vibrating under the influence of fluid flow, I want to include piezoelectric damping effect. Based on the related literature, I could...
View ArticleUnsaturated flow with dry initial condition
Hi, I am working with a Richards' equation model that tries to simulate an imbibition of a very dry soil. As anyone can see, in literature it's reported that Richards' equation has not good convergence...
View ArticleTwo Phase Transport PEMFC
Hi, I'm having problems in implementing the two phase transport in the Low-Temperature PEMFC model. Initially, I built a model composed by the following physics: 1. Secondary Current Distribution; 2....
View ArticleComsol and the Intel Xeon Phi
Hello everyone, We are considering building a workstation for use with Comsol. Does anyone know whether Comsol supports the new Intel Xeon Phi many-core co-processor, and whether it uses the Xeon Phi...
View ArticleVortex Tube Analysis
I am new to comsol. I am using ansys fluent. to analysis vortex tube in fluent there is an option called swirl dominant flow under k-epsilon. is there any option in comsol like this -- quiting is not...
View ArticleFrequency Detection with Piezoelectric Sensors
Dear all, I am trying to obtain the FFT(Fast Fourier Transfer) of a frequency reading that a piezoelectric sensor is detecting. The layout of my model is two piezoelectric sensors that send frequencies...
View ArticleDirect- Fully Coupled Solver [Strange Behavior]
Dear All I´m working on a Natural Convection Tower model. It has the Heat Transfer and Low Re K-e CFD interfaces. And I am using Time Dependent, Direct Fully Coupled method. I undestand that reciprocal...
View ArticleEquation-Based Modeling is dimensional or dimensionless?
Please help me to understand more clearly about dimension in the Mathematics branch (in Comsol 4.2). I would like to quote here some information from the User guide:"The Mathematics interfaces are...
View Articledefining a no-flux 2D surface on top of a 3D box
hi Everyone, i'm qiute novice to comsol and have the following problem: i need to to visualize diffusion in a 3D box made of GaAs that has a round mask on its top surface. now i know that i can just...
View ArticlePiezoelectric resonator with clamped edges
Dear all, I try to solve the next problem in COMSOL 5.2: 1. Brass beam with thin AlN film - flexural mode resonator 2. Electrical BC Ground and Terminal applied to electrodes area on top surface (no...
View ArticleSpur gear with permanent magnet creates a voltage in coil
Hi I'm trying to solve very interesting task but don't know how. A permanent magnet (Neodymium as material) is surrounded by circular coil both packed in aluminium case, so it's a magnetic sensor....
View ArticleThe other problem; out of memory during LU factorization
Hello, everyone I have a little different problem with others First, my error message is similar with the others"Failed to find a solution. Out of memory during LU factorization. Returned solution is...
View ArticleCoaxial feed with slot antenna
Hi everyone! I need to connect the coaxial feed with a slot antenna...I used a parametric surface as you can see in the picture but it doesn't work...How can I solve the problem? Thank you In the...
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