New "Introduction to Multiphysics" book
Hello, We are pleased to announce that a new version of the "Introduction to Multiphysics" book is now available for immediate download...
View ArticleNew "Introduction to Multiphysics" book
Hello, We are pleased to announce that a new version of the "Introduction to Multiphysics" book is now available for immediate download...
View ArticleUsing the Optimization Module for geometry examination
Geometry optiization 4.3a Simple 1D sold state battery problem (in COMSOL) Done with assistance from COMSOL M = length of anode 320 nm L = length of solid electrolyte 1500 nm objective function =...
View Articlevoltage at different coordinates
Hello every one. it is possible in COMSOL to fine the voltage at (x,y,z) coordinates? thank you
View ArticleUndefined value found.
I am using poroelasticity module to simulate soil behavior of porous materials, the error information is as follows: Undefined value found. - Detail: Undefined value found in the stiffness matrix....
View ArticleInlet Boundary velocity
Inlet boundary velocity profile = 4*s*(1-s)*Umax What is actually represent this equation? What is s? What is the different between normal velocity and Umax?
View Articleimporting a 3D gegmented image as a geometry
Hello everyone, I am trying to import a 3D segmented image into the COMSOL as a geometry. Is it possible? Actually, after testing a bunch of softwares and doing some tricky things I finally succeeded...
View ArticleAdding temperature varying with time
I want to enter temperature for calculating heat flux (temperature varies with time). Is there any method of entering the values? How can I use functions like interpolation, Rectangular etc,,,
View ArticleHow to determine face numbers (using matlab livelink) associated with an object
Hello again, I am trying to 'automatically' set my boundary conditions for a model generated in matlab with livelink. I know which objects need to have which boundary conditions based on a draw order...
View ArticleJoule Heating - Study help
Hello all, I am currently working on modeling the thermal stresses of a surface mounted component on a PCB. However, i am currently struggling to get the physics to work. I have followed the available...
View ArticleComsol on HPC server
I have just set up Comsol on a 48 processor machine using HPC server it is one machine with no cluster. It is running extremely slow. When using all 48 processors it takes over 137 seconds to process...
View ArticlePoint Charge
Hello all I want to define point charges (lets say some circles as positive Or negative charges) in Comsol. Can anybody give me some idea how i can do this? what I have in my mind is: define a constant...
View Articlewhere can I find the user guide for "Heat transfer module" and "joule heating...
Hi guys, just wondering where can I get the user guide of "Heat transfer module" and "joule heating module"? Electronic files will be better. I do have it for v 3.5, but as the software upgraded to...
View ArticleParticle tracing - particle counting
Hello to everyone, Im new to COMSOL and currently trying to work with particle tracing for fluid flow. The model we are working on is part of vascular network and we are using as physics : structural...
View ArticleError: Parameter lists gives empty sweep
Hello, I would like to know the reasoning behind this error in return of a monotonously incresing series of frequencies. Examples: a) 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 90,...
View ArticleProperties of magnetic flux in some transformer sheets
Hello everyone, i´m trying to observe the magnetic flux density in a smal gap of some transformer sheets. So far building the model and getting results that are in consent with my experimental setup...
View ArticleAutomatic remeshing depending upon the gradient of the solution
Hello, everyone, I am solving a nonlinear equation on the plane. Its solution, u=u(x,y) is everywhere close to zero except for some region in the vicinity of the coordinate origin. This region is not...
View ArticlePostprocessing in cyclindrical coordinates
I am doing a plane strain analysis of a pipe with a crack in it. I would like to get the stress components in the cyclindridcal coordinate system (radial, hoop stress) rather than in the cartesian...
View ArticlePressure in Reacting Flow in Porous Media
Hello All, I am running a model in 4.3a with the node "Reacting Flow in Porous Media," and simulating groundwater flow in a confined aquifer. When I look at the results, my average pressure gets down...
View ArticleCloth or flag modeling
Hi all, Does anybody have a COMSOL model that simulates a cloth on a table or a flag moving under a wind flow? Cheers, SL
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