comsol 4.2a with matlab R2011a
Hi, I saved the comsol file in matlab as told. The tutorial says open ''COMSOL with MATLAB''. What does that mean? Also i get an error as follows when i run the m file of the comsol model. Undefined...
View ArticleShallow water waves model in coefficient PDE or general PDE
Dear All, I want to solve the Shallow water waves equations in PDE module in 2D. h is the water elevation, U and V the velocity components along x and y. How can I implement an incoming pulse in the...
View ArticleParticle Selection
Hello, I running a simulation to release particle in an electric field and observe their tracks. I wish to find out how many particle and how fast they reach a certain boundary. I have been able to...
View ArticleHow to use compressible gas flow .
Hi I am trying to find a module for doing the analysis of a gas flow in a little 2-d chamber where I am using a compressible gas at a predefined pressure from a tank ranging from 3-6 psi-g at the inlet...
View Articlecomsol element reference and theory manual
Dear all, Depending on the module that is selected, the elements are selected automatically also I guess. I have several questions related to this proposition if that is right, namely, + Is there a...
View ArticleOutliers in parametric sweep results
Hi, I'm modelling an eddy current testing probe with the AC/DC module. So far the model basically consists of a transmitter coil, an aluminum plate test specimen, and a receiver coil. I'm using COMSOL...
View ArticleCapacitive sensor - coupling with circuit
Hello, I build a small model of a capacitive sensor (small conducting plate). An electric dipole serves as the source of an electric field. The field induces a surface current density at the sensor...
View ArticleChanging S parameters
I am calculating and then plotting the reflection and transmission coefficients [abs(S11)^2 and abs(S21)^2] for a plasmonic wire grating structure using the RF module. Initially I set the ports at a...
View ArticleWavelengths seen in 2D plots
I am simulating the intereaction of EM radiation with a plasmonic element. I have set up the study to parametize the wavelength of the incoming radiation from 4 um to 20 um. In looking at the fields in...
View Articleconstant volume while deforming one boundary
Hello everyone Does anyone know how to implement a zero volume change constraint on a 2D geometry with one surface deforming? I am using ALE interface and I am prescribing a mesh displacement on one...
View ArticleTriphasic Material - Confined Compression
Hi, I have been using Comsol for 2 years now, for the past few weeks I have been trying to implement a mechano-electrochemical model, also know as the triphasic model to study the effects of mechanical...
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 ArticleAbsorbing boundary for acoustics
Dear all. I am trying to simulate a acoustics wave propagating through the air. The absorbing boundary that I set is "Matched Boundary". Is this a correct setting? The result went weird when the...
View ArticlePlot
Hi everybody I simulate the rib waveguide with mode analysis and in picture i attack it ,is a 3D plot. I want to convert it to 1D plot in x and y direction.How can i do it?I think it is so easy but i...
View ArticleInstallation error
Hi, I am trying to install 4.3b version. After installation and starting up the program I get the following error: License error -15.
View Articlethe best way to implement the anisotropic PML
For my master degree thesis, I’m doing some simulations on photonic bandgap fibers and I would ask you information on the PML. In particular, I'd like to know which is the best way to implement the...
View ArticleHelp for a better 3D mesh
Hello! I am a beginner in COMSOL and i need some help with a 3 D mesh! In my model i have to focus on the cylinders and around them. So i need finer mesh for this area but coarser mesh for the rest in...
View Articlecomsol 4.0 how to have unequal scaling on different axes
In comsol 3.5a, i could selected under options->axes/grid settings the option that the axes not be equal. I have problems where dimension along one of the axis are microns while along the other axes...
View ArticleAC/DC model: Matrix has zero on diagonal.
Hi everybody. I have to calculate the magnetic field around three cables. The model I built simply includes the three straight conductors and air around them. A small voltage difference is applied and...
View ArticleWork on COMSOL through MATLAB?
Hi, I would like to run COMSOL through MATLAB but don't understand how? For example when I have saved a COMSOL simulation as M-file and tries to open it in MATLAB it won't open and I am not sure how to...
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