4.3b analytic function Bug?
Is there a new way to define an analytic function in 4.3b? 4.3b gives me an error - funcname is a string (when I'm trying to plot it, when two copies of the same mph model opened). Also Gauss function...
View Article3D Model of "Voltage Induced in a Coil by a Moving Magnet"
Hi I wanted to do the 3D version of the Model "Voltage Induced in a Coil by a Moving Magnet" which is in the Comsol Library. I used the same physics, materials and boundary conditions, but...
View Article3D waveguide (time domain simulation)
Hello, Does anyone know how to overcome this problem when I am dealing with a 3D waveguide modeling? When I am computing, this msg appears " Operation cannot be performed on data set cpt1 (cut point...
View ArticleSystem of PDEs with mixed order
Hello, I am trying to solve the attached system of PDEs using the general PDE interface. However, I always get a singular matrix error. What am I missing?
View ArticleObstacle in fluid flow
I am new to comsol. I am working on a problem of deforming obstacle in fluid flow. I need to account for velocity of obstacle due to drag of fluid and plot the velocity field when steady state is...
View ArticlePML and RF Module
Hi, I am trying to find the eigenmodes of a grated ring waveguide. To do so I simulate a segment of the ring and use periodic boundary conditions. Since light should be radiated upwards and downwards...
View ArticleCombining particle tracing and rotating machinery modules
HOw do I combine the particle tracing and rotating machinery modules so that they can run simultaneously in a study? I am attempting to study the particle trajectories in a 3-D mixer (the same mixer...
View ArticleNano Optics - Single dipole near infinite interface
I am trying to reproduce far field radiation patterns for single emitters close to an infinite dielectric interface. Namely, I place an emitter in air, in the vicinity of a glass substrate (10[nm]...
View ArticleUsing a Gaussian Pulse
Hi everyone, I'm actuallay working on a modeling of a laser pulse which is heating a front of a material in order to determinate the diffusivity, my current issue is that i would like to model my heat...
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 ArticleInterrupt studi
Hello. I am new to COMSOL and I want to ask how to interrupt study in some condition and change the parameters of the model? Thank you. Goodbye.
View ArticleMulti turn coil problem (frequency domain)
Hello, I want to calculatate the magnetic flux density of numeric multiturn coil domain. I conducted the tutorial mode"multiturn coil asymmetric conductor". After I conducted that model, I build my...
View ArticleFourier's law
Hi, I would like to check the following Fourier equation: φ =-λ.grad (T) in this simple modele. My model consists of two concentric cylinders separated by a gas gap. A power density (Q) is placed in...
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...
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