cantilever_beam
Hi, I would like do a complete project on energy harvesting from piezo resist cantilever beam using Comsol. I got an output voltage of 1778 v by applying 0.1 m/s^2 prescribed acceleration to...
View ArticleCapacitance from sinusoid voltage
Hi everyone! For modeling I am using 3D Comsol Multiphysics // AC/DC module // Quasi Statics, electric // time harmonic analysis. In postprocessing Comsol calculates and plots electric potential and...
View Articlesolar collector
Hello im a chemical engineering in mexico, i need to do a simulation for a solar collector but is the first time that i use this program and i dont know how to use and create this simulation can you...
View ArticleElectric field in air between metal tip and semiconductor
Hello, I'm new with COMSOL. I'd like to know what is the most suitable module or procedure to study the electric field in air between a metal probe and a semiconductor. I understand that...
View ArticleModeling packed bed reactor
Hi I am a beginner of COMSOL. I would like to design packed-bed reactor. The reactor diameter is 1 mm, and the particle size is about 1 micro meter. The porosity of packed bed is about 60%. If I want...
View ArticleLocalSelectionImpl/set error when using mphinterp
This is not a question, rather documentation for anyone who might encounter the same problem in the future. I followed these steps: 1. Build a model. 2. Delete everything non-essential. 3. File ->...
View ArticleSolution for Time-dependent Solver - not working properly
Hi All, I seem to be having a difficult time solving a time dependent solution for any of my darcy flow porous media models. The problem I am encountering is that all the time solutions that are stored...
View Article2D, Magnetic and electric field module
Hi everyone, I'm trying to model a very basic problem. I have a conductive current carrying wire (an extremely thin wire actually) and I would like to obtain the spatial distribution of the magnetic...
View Articlemultiple integral
hi to all i want to calculate the following integral. how can i do it? plz see the attach file. in this file h is the variable and not important for me.only it is important for me the calculation of it...
View Articlebuilding a multicomponent gas mixture in comsol
Hello All, I was wondering if someone could help me with building a multi-component gas mixture in COMSOL 4.2. I have my biogas composition of 66% CH4, 33% CO2 and 2% H2S and I need to define...
View ArticleHow to solve the problem of negative concentration
I am a totally new user on comsol. Now I try to simulate the mixing in the microchannel without reactions. I use the laminar flow and Transport of dilluted species. There is a similar example from...
View Articlefaces are too close in 3d domain
Hi, I'm making a copy of my pipe geometry, and then when I make the 'convert to solid' the following error occur:"Faces are too close in 3D domain". Why this is occuring? best regards, gustavo
View ArticlePhotonic crystal fiber
I am trying to model a photonic crystal fiber with liquid crystal filled holes.. I am a starter and it would be really helpful if any one can help me regarding the resources from where i can learn the...
View ArticleUsing the grad-free optimization and the with operator.
Hello, I am currently using the Grad-free operator to try to solve an inversion problem. The problem consists of taking measurements of a magnetic field at the surface. We are making synthetic models...
View Articlesolid core photonic crystal fibers
hai. Iam doing research on solid core photonic crystal fibers I have doubt in calculating mode field diameter and confinement loss of solid core photonic crystal fiber Presently doing simulation using...
View ArticleChoosing Font Type Via the Preferences Menu
Hello All, I would like to choose a different font type to be displaced in my graphics window. Reading the documentation, the way to do this is to go to preferences->Graphics-> Load System Fonts....
View ArticleSimulation of Van der Waals forces using Comsol v4.3
I'm trying to simulate the attractive Van der Waals force between two nanometric structures. My initial idea was to integrate the Lennard-Jones potential created by one domain (\integral...
View ArticleNano-scale to Macro-scale
Hello COMSOLers, I am working on a model dealing with an adsorption reaction in a porous media that generates heat, and the heat generated is then transferred to a heat transfer fluid (air). The...
View Articlephotonic crystal fiber
i am new to comsol i am using pcf having air holes in cladding region bt i am nt getting the confinement can any one tell me how to do it? can some one can attach any models on this?
View Article4.4 Feedback
Greetings, We've updated to 4.4 last week, and my experience is negative. The first thing is the interface, simply horrible, even windows 8 has a better interface. Second is selecting domains or...
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