Finding path loss in Wireless underground sensor networks (WUSNs)
I want to calculate the Path loss in Wireless underground sensor networks (WUSNs). I have equation Pr = Pt + Gr + Gt − Lp where Lp = L0 + Ls and Ls stands for the additional path loss caused by the...
View ArticleMicrowave heating
Hi, Has anyone seen the microwave cancer heating documentation? www.comsol.com/model/download/...t.microwave_cancer_therapy.pdf I am curious about one thing: In the section where they say (page 4):...
View ArticleSelecting a point
I want to get the co-ordinates of an arbitrary region within my model so I can see how the pressure changes at that point. Does anybody know how to do this?
View ArticleAC/DC module ground problem
Hi i am new to comsol, i am working on an electrostatic, I want to get the electric field due to a charge distribution, but when i work without ground, i got an unexpected solution totaly, and when I...
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 ArticlePhase change: freezing and convergence problem
Hi, I'm currently working on a water solution freezing model including the phase change. I use the COMSOL model : www.comsol.com/model/phase-change-474 Geometry: I just add a metal part below the...
View ArticleInfinite Elements - Electrostatics
Hi all, I try to simulate an charged object inside an unbounded region. I use the AC/DC module --> Electrostatics in Version 4.1. I attached the file. The outer bounds are ground and the charged...
View Articlesoil plasticity in poroelasticity
I am doing a project using poroelasticity interface, but I wan to consider plasticity behavior of porous materials, so I need to use plasticity constitutive model for porous materials. How do I add...
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 ArticleHow to cut a geometry
Hello, I have a 3D geometry and I need to cut half of it to create a symmetry plane. Can you please describe the steps. Thanks. Regards, Dimitris
View ArticleSetting a point to 1 and calculating impressed current density
Hello, I want to set a point to 1 in my geometry, and calculate the impressed current density that it creates. Gizem
View ArticleParametric Sweep of the Move funcion
Hi, I would like to so a simple parametric sweep of the position of an element in a 2D model. I define a parameter under global definitions and then under Geometry1 I Move1 by that parameter....
View ArticleRelease Features
I'm running a simulation in the Free and Porous Media Flow physics and have run several successfully so far, but I've modified my geometry and am now receiving this error: Errors during multiphysics....
View Articleequation system
I want to use the following bidomain equation in my simulation :∇·((σi +σe)∇φe)=−∇·(σi∇Vm) I have two spheres one within the other as geometry. Inside the smaller sphere I want to introduce Vm as a...
View ArticleDifference between form union and form assembly
I performed the "compose" operation on my geometry deleting some parts which I did not want, but then when "from union" those deleted parts showed up again in the final geometry. Only when I do "form...
View Articleplacing electric and magnetic dipoles on top of thin (~50 nm) gold film
Hi, Can someone help me to model electric and magnetic dipoles on top of gold (~ 50 nm) thin film. I am using RF module for this. I'll really appreciate any help. Thanks.
View ArticleModel coupling to 2D to 3D geomety (General Extrusion)
hello all, I want to do a model coupling of 2D geometry and 3D. For this i used general extrusion coupling for that. I want to couple outlet ( along y axis) and inlet boundaries of 3D geometry through...
View Articleselecting the surfaces for surface-to-surface radiation
Hi, When I definie the surface-to-surface radiation boundary conditon, it is quite troublesome to select the surface one by one. Is there any easy way to select all surfaces for surface-to-surface...
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...
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