Forced external convective cooling
I have what must be a stupid question about cooling by external forced convection. I'm trying to model a metallic object that is locally heated on one surface and that will be cooled on the other...
View ArticleUsing external file data for heat source
Hi all, I am trying to solve a model for heat transfer in solids using external data as heat source input. The geometric model is simple and composed of 3 separated bodies attached together by a...
View ArticleSurface roughness
Hi, I'm new to COMSOL Multyphisics. I successfully built a 3D model of Laminar pipe flow. My idea is to build a pipe that is made of stainless steel and then change to glass with the same diameter. I...
View ArticleMagnetic Particles Path Tracing
I want to plot trajectory of magnetic particles in a magnetic field of coils designed by me. When I use the built in particle path tracing module , it does not give any option to define to define...
View ArticleMagnetic Particles Path Tracing
I want to plot trajectory of magnetic particles in a magnetic field of coils designed by me. When I use the built in particle path tracing module , it does not give any option to define to define...
View Articlerectangle equation
Hello, I am aiming to create a rectangle equation that depends on x and y in COMSOL 4.3a. I read an article in which the author created a similar one shown below: min(min(x,8-x),min(y,6-y)) in FEMLAB...
View Articlebiphasic flow
I want to do a simulation of a two-phase flow of a water drop in air with "comsol 4.2", but I could not, he displays this error "Failed to find consistent initial values. Last time step is not...
View ArticleNersnt-Planck model
can anybody give tutorial other then given in library, where Nersnt-Planck model has been solved by 2 or more species. I have solve the library tutorial but still I am not comfortable.
View Articlehow to create polar plot in journal bearing
hello, need some help from u all to plot these polar plot. these study about pressure distribution around bearing surface of hydrodynamic journal bearing.. radius bearing : 50mm height bearing : 50mm...
View ArticleTwo very basic questions about direct solvers
Hi all, I have two very basic questions about direct solvers. 1. Why is there convergence problem with direct solvers? I suppose direct solvers inverse the matrix somehow directly, rather than...
View ArticlePDE Initial value
Hello, I am trying to construct a circle as my initial value on a 6x8 rectangle as my domain in the PDE general form of V4.3a. In V3.5a I can do this by entering sqrt((x-3)^2+(y-3)^2)-radius, but I can...
View ArticleFind Cross Sectional area perpendicular to an axis at every point
I have a variable diameter hose and I want to find the mass flow through this hose at every point. There are no bends in the hose except to change its diameter so the hose's central axis is in a...
View ArticleCluster computing
İ am trying to solve a problem using cluster computing with HPCS 2008. Comsol starts solving the problem using the nodes. At the end of first iteration, program does not show any progress although it...
View Articlecluster computing
I was trying to solve a problem using cluster computing with HPCS 2008. The program produced the foowing error. What can i do to solve the error. --------- Current Progress: 100 % Memory: 336/342...
View Articleliquid thermal expansion by comsol?
Hi I want to simulation air thermal expansion in a sealed chamber, leading to a deformation of PDMS thin membranes on the top of chamber. I can not find suitable example form COMSOl. Does anybody give...
View ArticleModeling a transient plane-wave
Hi, I have just started learning myself Comsol 4.1. I have earlier experience with version 3.5 , though. My question relates to time-dependent transient analysis in RF-module. I would like perform a 2D...
View ArticlePlane wave in RF module
I have been trying for a while to produce a plane wave using a custom transient waveform using the RF module with no success. I have gone back to try to reproduce the 3-D gaussian beam example file to...
View ArticleMass Concservation in Two Phase Pipe Flow
Hi folks, I was wondering if there is a way to check if the mass conservation principle is uphold in COMSOL for pipe flow. I am using glass spheres in water in my simulation and due to some...
View Articleexporting data
Hi all I have a 3D cube and I need to get isothermal lines at the surface of the cube.If I am using the contour plot (line) option but the quality of isotherms are not good. Can anyone tell me how to...
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