Capacitive 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 Articleacoustic and structure deflection couple field
hi, I am interested in finding out the sound pressure generation when we release pressurized air on the diaphragm of pressure(air) horn, Till now i have modeled 3d model of air horn, plz suggest me...
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 Articlelarger ICP model causing problems - singularity error
Hey, I am using your thermal_plasma model as a basis to my model. It is almost the same. The only difference is that in my model the tube is straight (not curved) and longer (0.8 m). These are the...
View ArticleAdapative Mesh Refinement with Mapped Distribution
Hello, I'm using Comsol version 4.3 and, for some reason, when I try to use adaptive mesh refinement in the Stationary Solver's extensions, it claims I can only use triangular mesh elements for it. I...
View Articlesilencer duct
Hi I want to simulate insertion loss for ventilation ducts. I need to define inlet and outlet pressure so i can calculate insertion loss by its difference. There is a similar sample "perforated...
View Articlecan i calculate the absorption coefficients of absorber composed of...
hi, i am a new to comsol,. And i want to calculate the absorption coefficients of a absorber composed of micro-perforated plate and porous material. can i calculate the coefficients of micro-perforated...
View ArticlePML Error: Could not find any cartesian regions
Hi I am new to PML. I am using Structural mechanics module to implement PML in a cantliver to determine the waves propagating to the PML. I am getting this error: Could not find any cartesian regions....
View ArticleAdding points and lines to 3D models with parametric surfaces
Hi all, I was wondering if there is a way to add a point or line to a model in which I have a 3D block with the top surface replaced by a parametric surface derived from a DEM (digital elevation...
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