MMI waveguide design...using PML
Hi, I'm new to COMSOL, attended one of the workshops and have been going thru the tutorials. I'm trying to design a slab waveguide...with a core refractive index of 3.48...cladding of 1.54....about...
View ArticleAxisymmetric Hertzian Contact mechanics model
Hi, I am trying to model a sphere pushing on a surface. To do so, I have created a 2D axisymmetric model with a point load close to the apex of the half-circle; as putting a point load right at the...
View Articleflload not working
Hi everyone, i'm new to comsol and I have a problem with COMSOL-with-MATLAB. I have the 4.2a release and matlab 2011b. I need to use a .mph file in matlab and my colleague suggested me to use the...
View Articlewhat is value of "relative permittivity" for gold (au) and aluminum (al) ???
any buddy help me to tell what value should make appropriate result in actuator of relative permittivity - au ____?? relative permittivity - al ____??
View ArticleSet geometry/boundaries using a variable?
Hello, I am trying to solve the device physics equations for a 1D (eventually 2-3D) solar cell with the PDE solver. However, a solar cell of fixed total thickness and two physical layers typically has...
View ArticleData import from one simulation in comsol to another
Hi, I checked the heat transfer in solids for my structure and now I need to use this heated up condition as an initial condition to cool down the device and see how long it will take, (time dependent...
View Articleenergy storage model (joule unit)
Hello sir I have a simple 2D model which has energy storage in the middle of model. I want to see how temperature profile changes with time. To simulate my model, I need to 1000J(joule) in storage...
View ArticleHardware upgrade: how to compare AMD to Intel?
I am looking into upgrading to a High Performance Computing work-station to do mostly computational fluid dynamics computations in COMSOL. Aside from sufficient RAM and appropriate number of...
View ArticleQuestions about defining different variable in different equation in subdomain
Hi, I am now using PDE model to slove Laplace and Poisson equations. My model has three domains. I have used V as the variable in Laplace equation in two dielectric domains outside and V0 in Poisson...
View Articlephotonic crystal fiber (Higher order modes)
Hi, I have designed few photonic crystal fibers using COMSOL software. How would i determine the higher order modes using this software? Thanks in advance.
View ArticleJava API SwingGraphicsPanel
Hey there, i am currently working on a GUI for the COMSOL results using the Java API. Now i have a very annoying problem. I use the class SwingGraphicsPanel to display the results but sometimes it...
View Article2D->3D
Hi, I built a working 2D model of a redox flow battery and now I am trying to convert this model into 3D. I used the same BCs and the same initial values but it does not converge. I get the error...
View ArticleModeling Multi-turn circular coil
Hi, I would like to model a multi-turn circular coil as shown in the picture. However, i am confused with the modeling procedure. My objective is to perform RF coil simulating in Comsol. As that i am...
View ArticleHow to become expert in COMSOL
Hi Guys, I am working on COMSOL 4.3a from last three months but still facing some difficulties to become expert in its use. I am not from Engineering background so don't have any experience about...
View ArticleConvergence problem with Comsol 4.3b
Hi Everyone When I run the model in the 4.3a, it can work very well. The convergence firstly is about 1e4 to 1e5. When the comsol software is updated from 4.3a to 4.3b, the convergence becomes 8e8 and...
View Article2D simulation with floating electrode
I am fairly new to COMSOL and was wondering of anyone knows how to correctly define a floating electrode in a 2D simulation? I have some strange results from my simulation. I have two concentric...
View Articlehorizontal stress only shows in the top layer
hi i'm simulating a road using the elastic model. the road has 3 layers (asphalt, foundation, soil) with different moduli. when I apply the loads of the wheels, I can clearly see how the vertical...
View ArticleFor a 3D geometry, is there anyway to get data from one of the plane without...
I have a 3D cylinder, is there anyway for me to get the information on the top surface and feed the information back to my simulation? is the boundary probe the only way? Or is there any way I can say...
View ArticleLift and drag force
Hi all, I am simulating a 2D, turbulent flow over the airfoil. In the post-processing level, I do not know how to get lift and drag forces applying on the airfoil. To compute reaction forces, As far as...
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