Question about Truss Module and plasticity
I am modeling a reinforced concrete beam using almost an identical model to the reinforced concrete beam that is provided in the COMSOL tutorials/models. I need to model the rebar as elastic-perfectly...
View Article1 physics or 3 physics (turbulent laminair flow)?
Dear all, I need to simulate a situation in which I have two different streams of air seperated by a thick solid. One stream is clearly a laminar flow the other is clearly a turbulent flow. Now is my...
View ArticleFrequency-Domain, Perturbation
Dear all, I'm simulating impedance spectra on a newman type lithium ion battery model. I use one single solver Step: Frequency-Domain, Perturbation. There is one single "Electrode Current Densitiy"...
View ArticleIntegrate one Study in another
I am trying to solve a study with a fluid flow problem and an electrochemistry problem. Both studies can be solved by themselves but if I want to solve them together or use the Velocity field of the...
View Articlecomsol not using the entire memory
I have 32GB of ram on my computer with an 8 core cpu, but the transient solver im using does not go beyond 7gb and my processors running between 40 to 60%. I looked upon a few threads on the forum but...
View Articlejava.lang.ClassCastException when using LiveLink from MATLAB
Hi there, I've been successfully using COMSOL and LiveLink for a few months now for generating and simulating electromagnetic models. However, yesterday I ran the same MATLAB code as I always do, but...
View ArticleLight Propagation in Tissue
i just want to simulate the propagation of monochromatic light (800nm) in a 3 Layer tissue model 3D. Does anyone know a working Comsol solution? Problem: to many elements with this wavelength. Setup: 3...
View ArticlePCB w/ Components simulation
Can i take my PCB w/ all the components and simulate in Comsol? My PCB is simple PCB generaly w/ Fet driver that drives a PCB planner coil
View ArticleModeling hyperelastic material using "neo hookean"
I'm trying to model a hyper elastic material using the "Neo- hookean" proporties. It is my first time working with hyper elastic materials, and the solving of the problem is causing me trouble. The...
View ArticlePre stressed frequency domain analysis - How to: Values of Dependent variables
Hello, I am trying to use the solution of the static deformation as the initial conditions for my frequency response analysis. First, I have prepared two solutions, the static deformation is calculated...
View ArticleUsing the grad-free optimization and the with operator.
Hello, I am currently using the Grad-free operator to try to solve an inversion problem. The problem consists of taking measurements of a magnetic field at the surface. We are making synthetic models...
View Articlesingularity. error
Hello, Does anyboday know why I encounter the below error message in Comsol 3.5a? Error: Time 7.86913096623935e-007: Repeated error test failures. May have reached a Last time step is not converged....
View ArticlePropagation in PEC waveguide
Hi, I was trying to simulate a rectangular waveguide (side=500nm) with PEC sidewalls. I am using a port boundary condition to excite a TE01 wave from the top and use another port condition at the...
View ArticleElectrical Circuit in Electrostatic Simulation
Hello! Is it possible to have a electrical circuit problem connected with an electrostatics problem? For example I want to connect a capacitor with a certain value to my electrostatics simulation. If...
View ArticleCould you please tell me the name of the variable for time steps in comsol?
Hi I am working in comsol 4.2a version for hydrogen storage system modelling. Could you please tell me the name of the variable for time steps in comsol?
View ArticleMass flow unsymetric matrix error
I am trying to do simulation of turbulent flow through a valve. I have a problem that the pressure variable seems to become unsymetric as soon as I have flow through the inlets of the valve. I am able...
View ArticleExport water table time series data from periodic Richards equation solution
Hi, is there an (easy) way to export a time series of the water table elevation (p=0 contour) from a time-dependent (periodic) Richards equation model? I have a 2D vertical rectangular grid with a...
View ArticleNavier-Stokes Solver
Hi dear Jorge Concepcion, Please find attached the model you are working on. (seems working) I have implemented your equations and set your geometry. I have done a test with your BC, it seems that you...
View Articleresidual computation error
when given for solving, an error occurs as shown below: error: time: 0.005389521413017638 Error in residual computation extrusion_coupling_operator_interpolation_failed...
View ArticleComsol does not use all RAM available
Dear all, running Comsol on my laptop, I see that it uses only 4-5 Gb of the available 16Gb RAM, and in fact it takes a very long time for simulation of time-dependent 3D problems. I don't have any...
View Article