Import from SolidWorks
Hi, I was following the tutorial for the cooling of an injection mold (www.youtube.com/watch?v=JyXhGKN3iX0), and I want to ask is there any way to import the curve for the cooling channels directly...
View ArticleBoundary conditions in heat transfer
Hi, I want to model a muscle tissue containing a capillary blood vessel. Now I’m using a simple model for start… My model geometry is in the attached file. As I want to model heat convection between...
View ArticleIntegro-partial differential equations
Hi I am fairly a newbie to this software and i am wondering if it can solve a set of complicated integro-PDE together. It's crystallization kinetics from supersaturated solution which has three...
View ArticleEdges are too close in 2D domain
Hi, I have some troubles while defining 3D geometry from 2D work plane. The error message was "Edges are too close in 2D domain" and it was from "Form Union" section. Would you please help? Thanks
View ArticleSolver Steps
Hi All, I'm computing a model via LiveLink with Comsol 4.2a and Matlab 2011b. It's an electrostatics model with nothing fancy in the physics / geometry. The model solves correctly, and I am now turning...
View ArticleEigen frequency analysis
hi, i am dealing with a nanotube sensor...can i use eigen frequency study step to find frequency at which displacement is maximum or should i use some other study step..
View ArticleState Space Export
Hi , i have build a simple cantilever beam model using time depented model. after defining the points of forces and parameters, i want to export the model to matlb (State Space Matrices) so i could...
View Articlegas mixture
Hi I am trying to model an ejector with 2 inlets and one outlet. In the first inlet I have hydrogen with low pressure, in the second inlet I have (hydrogen 30% + steam 70%) with a higher pressure. The...
View ArticleWeak Constraints from COMSOL 3.5 to 4.2a
Hi I have seen many posts regarding this but none had any definite answer. I am trying to follow a tutorial which involving Stoke's flow, and have the following problems: 1. "Go to Properties of mmglf...
View ArticleConvection-diffusion equation and/or advection equation: incorrect solutions
Hi, I have been working with the convection-diffusion module of the COMSOL Multiphysics module (version 4.3a). I want to study how a charge density (a cloud of electrons) drifts horizontally and...
View ArticleStructural optimisation
Hi, I am using a livelink from Solidworks to Comsol in order to import 3D geometry and quickly define some geometry parameters. I've made a structural analysis with applying torque load to my model and...
View ArticleBoundary conditions on internal boundaries
Hi everybody! I have a problem applying boundary conditions to internal boundaries. My model is a simple block and I drew a smaller rectangle on one of the faces (i.e. an internal boundary, see file...
View ArticleRetrieving boundary nodes matrix
Hello, Does any one know if it is possible to get a fem matrix corresponding to boundary nodes? That is, suppose that I define a variables u=z (u is the solution) on part of the boundary, is it...
View ArticleBoundary conditions for temperature rise in nanowire due to Joule heating
In the Joule heating module (2D), I want to know what are the boundary conditions required for the temperature rise in nanowire, when 1 mA current is passed through the wire having cross-sectional area...
View ArticleCan I link models or studies via an internal variable?
Hi, I'm struggling with a diffusion-only problem using dilute species transport. I would like to set the flux of species B into my system by setting it as the equal to the negative of the final...
View Articleerror 2128 revolving a geometry
Hi everyone. I'm using comsol 3.5a in Windows 7 64 bits. When I try to revolve (or extrude) a geometry (or mesh) in an axysimetric mode I get the error 2128 "Unsupported operation on this type of...
View ArticlePlanar Capacitor Sensor: Simulating two dielectric layers in Series
Hello All, I have a little dilemma. 1) I have built a model of a 'Comb shaped' capacitor sensor and simulated using COMSOL which worked great, I simulated changes in water level in a PVC container the...
View ArticleAcoustic-Structure Model
Good evening, I am attempting to model the response of a fixed beam when driven by an acoustic source within a fluid. Initially, I used an eigenfrequency study and obtained results that make sense to...
View ArticleConfinement loss in hollow core pcf
Hi i am trying to design a structure hollow core in comsol 4.3b. But i dont know how to show some information after compute, such as: confinement loss, dispersion... Anyone can help me, please?? i...
View Articlewho can tell me why the magnetic force different?
I did a simple simulation in 2D or 3D, which include a block of soft magnetic material and a block of permanent magnet. I want to verify the force on soft magnetic material equals the force on...
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