RF Module: material dispersion for transient simulations
How do I simulate structures with dispersion using the transient solver in RF module? I am new at this, so any examples or step-by-step tutorials would greatly be appreciated.
View ArticleVery simple semiconductor simulation
Hi! I'm trying to learn Comsol, but it seems have run into a wall. I've looked thoroughly through the semiconductor_diode model as well as the MOSFET model (in the showroom). However, as I implement...
View ArticleHow to Couple Free and Porous Media Flow with Heat Transfer In Solids
Hi Everyone, I am new to COMSOL and I am trying to simulate a solar panel cooling system. I am trying to simulate in 2D the heat transfer between a thin rectangular layer (the photovoltaic cell),...
View ArticleFiber Bragg Grating simulation using COMSOL v3.4
Hello ppl, Im new here. Im doin thesis on Fiber Bragg Grating simulation. Can anyone help me on FBG issue that is it possible to design Fiber Bragg Grating using COMSOL v3.4? Let me know ASAP plz. Thanks.
View Articlejava.lang.ClassCastException when using LiveLink from MATLAB
Hi there, I've been successfully using COMSOL and LiveLink for a few months now for generating and simulating electromagnetic models. However, yesterday I ran the same MATLAB code as I always do, but...
View ArticleEmpty parameter list
Hi everyone, I'm beginner to COMSOL and I'm modeling hyperthermia cancer treatment with magnetic nano particles. I'm using bioheat transfer for the body cells, mixture model for modeling nano particle...
View ArticleMaximum number of Newton iterations reached
I have imported a 3D meshed model from simpleware to COMSOL 4.3b. Some of the materials of the model are Hyperelastic, Neo-Hookean. While running the model via Direct Solver at 99% of progress there is...
View ArticlePDE
I am currently working on COMSOL 4.0a. Can anybody tell me how the variables for stress are defined in COMSOL? Since I want to define a Coefficient PDE, which its diffusion coefficient (c) is coupled...
View ArticleMWP combined with DC
Dear Daniel, I am geting tired of comsoling... because I do not know anymore what I can do to make my models converge. i started with the waveguide microwave plasma from the model-library. I put some...
View Articlehow to show the error curve
Hi All, Normally there is an error curve to show the convegence speed when running a case. However, I closed some windon in Graphic and this error curve is not shown. Wihout this curve, I am not able...
View ArticleTime integration of a variable over the domain
Hi, I am solving a periodic fluid flow problem over a 2D domain. I need to find the time averaging of the term u*ux+u*vy at each point on the domain. I tried defining a global ODE but it gave an error...
View Articlesegregated vs fully coupled solver in comsol
Hi All, I have compared these two solvers for a heat transfer case with surface-to-surface radiation. Acutually simulation results, i.e., temperature distribution in the domain, are quite different....
View ArticleLinear elastic material
Hi, I implied two linear solid mechanic (linear elastic material) in two rectangular(( Rectangular1)and rectangular2 ) ), there is a common inner boundary( number 2) between these two rectangular, i...
View Articleperistaltic pump model convergence
Hello, I am working on a model that is similar to the peristaltic pump model available in the “model gallery”. I would like to use this example to present my problem. The peristaltic pump model does...
View Articlesolver sequences
Hi, I am simulating fluid flow and heat transfer in a cylindrical pipe. what i need is a very long term simulation (i.e., 25 years) and I am using pipe flow module which assumes the pipe and 1D and the...
View Articledp/dx and dp/dy in Comsol
Hello, I am working with a N.S equation. Does anybody know that p in N.S equation is static pressure or not? How can I find out that dp/dx=0 or dp/dy=0 in my simulation? Comsol bring out p as a...
View ArticleHow to use Two Different Times steps in Solver Parameters?
Dear Sir, I am using COMSOL 3.5a. And I am running my simulation for 6hrs. But I want to run my simulation in two different time parts. (i.e. for 1hr i used solver parameters for time stepping range is...
View Articleaxisymmetric hollow cylinder model with Boundary condition
Hi, I want to draw a axisymmetric hollow cylinder model which is cut axially along the length. The inner tube radius is 12.5mm, shell side radius is 25mm, with length of 1.5m. Also how i have to given...
View Articleautomatically shutdown
Ivar, Hi, this is Zhengliu from UCLA. I got to know you from the COMSOL forum, where you have been active in giving professional advice on many aspects. I really hope you could give me a hand regarding...
View Articlecapacitive accelerometer
hi, my project is capacitive accelerometer.i am totally new to this sofware.so can you please help me out with my problems. for a start i need a structure for comb drive actuator which i will be using...
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