confinement loss
Hi is imaginary part of refractive index could be positive or negative that means 1.028175433939737e-19 or -1.028175433939737e-19. I found in my simulation positive and negative values for different...
View ArticleSphere-Sphere Forces
Hello. Firstly, greetings to everyone, I am new here. So, I am trying to build a model based on this article: www.google.com/url?sa=t&rc...mp;sig2=HC5XPGRvo0qippVGnfngLg I am also new to...
View ArticleCounter_driven_ coils
I'm new to COMSOL and I'm trying to model the b-field lines of a copper coil matrix and its interactions with an inert copper plate. I've been able to build a geometry and mesh however I've confused on...
View ArticleChemical Reaction kinetics, error
Hi, this is my first try on Comsol, I am modeling the reaction kinetics of a monolith reactor, using plug flow model for a single channel. there are 3 reactions and 8 components. 2 reactions are at...
View Articlehelp please with initial conditions
Hi, can anyone please answer me? I really need help! I am tring for a while to work a problem I have and I need help. I have a running model (on the comsol-matlab interface) of electric current. the...
View ArticleElectromagnet in 3D
Hi!! I am a new user to comsol and electromagnetics domain. As a first step, I scanned through the models in model library in order to find the required modules for my geometry. I' ve sorted out much...
View Article3d Core, Error: Unknown function or operator
Hello, I have modeled a 3d core with a coil and the coil I have declared Muti-turn coil. And in the simulation I have the following error: Unknown function or operator Name: mod1.mf.mtcd1.intp_edge...
View ArticleFrequency Domain Analysis
Hi, I am trying to simulate a 3-D beam in COMSOL v4.3. This beam is free in one end, and in the other end, I want to applied a sinusoidal boundary displacement input D(t)= Damp*sin(2*pi*f*t). In the...
View ArticleMixture Model, Laminar Flow (mm) interface
Hi, I wonder if anyone here in the forum is using the Mixture Model, Laminar Flow (mm) interface. I have several issues when using this interface with a fully coupled solver (namely, singular matrices...
View Articleusing a time dependent function
Hi I'm trying to use a time dependent boundary condition with matlab. I need to simulate a boundary condition that change in a fixed sampling time, for example, every 15 seconds the value in the...
View ArticleCan I use 2D boundary condition?
Hi, I am trying to simulate the concentration distribution of reaction with known boundary condition. If I know the concentration on the each spot or pixel of boundary at any time, how can I pass the...
View Article3D fluid flow in a pipe
I am trying to model laminar flows being joined as a number of pipes are joined. I also care about the thermal effects, so I need to model the pipes as well as the flow within them. However, I can't...
View Articlehygro swelling
hello everyone. i'm a newbie on comsol. just would like to ask if anyone knows where i could find physics on the hygro swelling component of COMSOL. i have tried already to run thermo induced stress...
View Articleproblem with general extrusion
Hi I need to model high Reynolds flow in 3D. The model is very simple: it consists of one cylinder of length 40 meters, broken into pieces of 5 meters. I would like passing from a piece to another the...
View ArticleCoupling to a ring resonator
Hi, I am having trouble with coupling from a waveguide to a ring resonator. Light is guided along the waveguide however it is not coupled to the ring resonator (the gap is close enough). How should I...
View ArticleConversion: Comsol mesh to Comsol geometry
I have a question concerning the possibility to convert Comsol mesh to Comsol geometry. For instance, I have a Nastran surface mesh which has been imported into Comsol mesh but I would like to use this...
View ArticleProblems while using Interpolation function
Dear colleagues, I am trying to use the data output from a Matlab program as a source in my coefficient form PDE using the interpolation function. The data is being distorted by the interpolation...
View ArticleSolving Self - Consistent Schrodinger and Poisson with MATLAB and COMSOL...
I'm a COMSOL 4.2a user. I need to solve 2D self-consistent Schrodinger and Poisson equation. Thus, I need to feed the potential values and the wavefunctions to the Schrodinger and Poisson equations as...
View ArticleIdentifying the eigenfrequencies of a shell sphere
Hello, I am new to Comsol and I was asked to identify the eigenfrequencies of a hollow sphere of 100um diam. and about 3 um thickness. I started by using 2d axisymmetric analysis->solid mechanics...
View ArticleTime Space dependent Interpolation function
Hello! I want to use a velocity boundary solution u(x, t) from one physics in another physics. The timesteps, the mesh and the geometry are equal. I use the Laminar Two Phase Flow, level Set physics in...
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