Heat transfer through a helical structure.
I am currently working on a model where I am trying to estimate the total heat gained by a cold liquid passing through helical pipe with a rectangular cross section which is being heated by a gas...
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 Article3D and 2D integration from the walls of a cylinder
Hello, I need to get integral from the surface of a disk and the walls of a cylinder in 2D and 3D geometries. I am fine with getting integral from the surface of a disk in 2D axisymmetric geometry and...
View ArticleIs it possible to input non-isotropic thermal expansion coefficients for...
I am using Comsol for a small project using solid mechanics physics and was wondering if I could define a coefficient of thermal expansion as diagonal instead of just isotropic for a hyperelastic...
View Articlesolution of Navier-Stokes equation for shear modulus reconstruction
Hello I am solving Navier-Stokes equation for shear modulus estimation with comsol and livelink for matlab. The equation i have to solve in comsol is ∇.μ∇u+∇(λ+μ)∇.u=0 But i can not find this form in...
View ArticleParametric Cutlines and Exporting of Data
Hi, I am currently solving a parametric sweep problem where I am varying a geometry parameter. I wish to create a cutline on the geometry which depends on this. Currently I have my cutline defined with...
View ArticleWaveguide amplitude errors, scattering boundary condition
Hello everyone! I am modeling a waveguide with the purpose of verification, but I am getting high errors in amplitude when the length of the waveguide is not a multiple of the wavelength of the...
View ArticleTrouble with Livelink-tutorial
Hello, I am trying to set up the busbar example taken from the 'Introduction to LiveLink for MATLAB'-PDF. I am using Ubuntu 12.04, MATLAB 2013a and COMSOL 4.3a. I am able to proceed until mphgeom() is...
View Articlesimple tissue ablation model
Hey all, Im trying to set up a very simple ablation model of cardiac trouble and am having trouble the model is a simple 2D axisymmetric geom consisting of a square with a small rectangular electrode...
View ArticleCopper Electrodeposition in a Trench
I tried to extend the Copper Electrodeposition example in COMSOL, but I obtained "inverted mesh elements" and, hence, graphical artiphacts at larger times (> 14 secs used in the original model). You...
View Articledielectric shielding
Dear all, I want to add a dielectric around a wire (A=0.1*0.1cm2). I go through COMSOL version 4.1 user guide and I found out that there is Dielectric part in Electric Current node. But I could not...
View ArticleMulti Turn Coil - reverse field
Hi, I am building a Beam-Line simulation using COMSOL 4.3.0.151, using a geometry imported from a CAD file constructed by my engineer. 1st step is to assemble the magnetic optics, for which i imported...
View Articleabout heater simulation in the room
Hello! I am use comsol 4.3a , and use the non-isothermal flow physics to simulate the heater in the room. And the room has a door , and I want to set the door is open, and it is connect to the...
View ArticleHeat source: Temperature profile instead of heat
Hi, I want to use measured values to define a heat source in the "Conjugate Heat Transfer". I could already generate a 3D-function of these values which can be used as Q. But my problem is that the...
View ArticleThe wake of a ship simulation
Hellow Everyone, I'm a really noob beginner in COMSOL.. and I've been struggling with this (a priori great) software for 3 days to create a flow around a boat (or a random floating object). My study...
View Articleproblem with 2d force calculation in rf module
hi, i am a neophyte.. i am trying to simulate the force on a dielectric particle by Maxwell stress tensor method.. but i stuck at the very beginning.. The problem is that I have to define an electric...
View ArticleModify a surface
Hi I have just started to use COMSOL. I want to modify my surface of rectangle. I could import text file to interpolate data points. But how could I replace one of the edges by the interpolated line?...
View Articlemagnetic and electric field between two plates, with RF frequency
Dear Sir/Madam, I searched through forum and cannot find the answer to my question. I am trying to simulate electric and magnetic field between two copper parallel plates (2D axial symmetry)....
View ArticleCreate geometry from a matrix
Hi everyone, I am trying to create a geometry with Comsol 4.3 with Matlab 2012. The geometry I want to create is very complex. The geometry is defined by a matrix (the value 1 corresponding to the...
View ArticleLivelink for Matlab material definition issue
Hello, My problem is the following: I am defining a RF model: [...] model.physics().create('rfw1', 'ElectromagneticWaves', 'geom1'); model.study().create('study1'); s1 = model.study('study1');...
View Article