area changes when going from 2D to 3D
When drawing a circle the are changes when going from 2D to 3D in a 2D drawing or in a plane a circle is drawn with radius (57,61/2)[mm] resulting in a surface of 0.002602m² when extruding this plane...
View Articlemodeling of airlift reactor
Hi everyone, I have building a model to simulate airlift reactor for vaccine production. I had following the "modeling of airlift reactor" in model library COMSOL but I can't input mass balance to get...
View ArticleCOMSOL APPCRASH and closed
hi I have a problem for the new server computer using COMSOL 4.3 First of all, the performance of server computer is below. OS: windows 2008 server RAM: 512GB CPU: AMD 6238 (x4) GPU: Geforce GTX 550 Ti...
View ArticleLorentz force
Hi, with the new v4.0a, I miss the predefined Lorentz forces in the AC/DC module. In magnetic field mode (mf), there is at least the Lorentz force mf.FLtz_xyz. In magnetic and electric field mode...
View ArticleModeling a Kerr Effect
Hello. I want to model a material with birefringence that depends on the electric field inside the medium, similar to the Kerr effect where the index depends on the square of the field. This is...
View ArticleGeometry variation within Time-Dependent solving.
Hello, I was wondering if it's possible to change geometry according to time ( via internal or external function(MatLab)) ? ie: Making a block depth function of time.
View ArticleInterpolation Function Help
Good Morning, I'm having trouble using COMSOL's interpolation function, and I was hoping someone might be able to help. I'm trying to load data from a tab-delimited text file. I've followed the...
View ArticleWhat's the formulation of "mechanical energy flux" in COMSOL?
There are "mechanical energy flux," "complex mechanical energy flux" which I can derive or plot in the result. They are cool but still I want to know the definitions of them, how it calculates, and I...
View ArticleHarmonic Load
Hey, I'm new to COMSOL and I have a few questions about it. I'd like to do a Frequency Response Analysis of a structure with a harmonic load ''shaking'' it with a pre-determined force and frequency ,...
View Articlerigid particle carried by a channel flow
Hi I have to simulate the displacement and rotation of a rigid prticule in a fluid flow and I am not a professional on comsol. So, is there anyone who could help me? or if you have any examples of this...
View ArticleHysteresis loss Modelling of Inductor coil
Hello I have simulated inductor using AC/DC module and I have calculated the inductance and magnetic field around the inductor but now I want to calculate the hysteresis loss in the inductor. For that...
View Article"zero length" element
I am trying to model a bolt connection in an assembly. In order to do so I would like to place a node at the center of where the bolt hole should be (all bolt hole cutouts have been eliminated) and...
View ArticleEigen frequency????
hi, how can we determine what the eigen frequency of a designed structure is among a list of obtained frequencies..
View Articlephysical adsorption-which COMSOL module
Hi there, I am now working on a model about the absorption of solute by gold thin layer in a flowing cell. The absorption of solute by gold thin layer is physical adsorption. I want to know which...
View ArticlePerformance problems with Interpolation Function
Hello, I am using a 3d interpolation function with data from a large file (>100MB). When I execute a computation (e.g. an Eigenfrequency Analysis), it takes a long time (~15 min) before the solver...
View Articleheat transfer coefficients
I'd like to know more about the heat transfer coefficients present in the material library. I see that it depends from the surface temperature, from the temperature at infinite distane and from a...
View ArticleAnalytic function accepts only [m] and not [mm]
Dear all, I have a trouble using an analytic function: I get values only using the SI unit of measure, and not with the MPa one. The model is a first attempt of a welding simulation, and the analytic...
View ArticleOn microstrip impedance computation
Hi everybody, I'm a very beginner COMSOL user, I started just some few days ago with the 4.3a version and I need to build some microwave sensor models. I started trying to realize some very simple...
View Articleunit normal vector
Hello, I am solving a PDE using coefficient mode. I have a scalar filed, variable C, which has arbitrary boundary inside the domain (picture 1) that evolves with time. I want COMSOL to find the unit...
View ArticleOutlet for transient cases in two phase flow
I have problems converging a two phase flow with water and air. When the water exits the computational domain, I can see reflection of water. Also some cases diverge before the water reaches the outlet...
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