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Adaptive meshing

How do I implement adaptive meshing in a 2D mode in COMSOL 4.3a.? -- MKSharma

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Adaptive meshing

How do I implement adaptive meshing in a 2D mode in COMSOL 4.3a.? -- MKSharma

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Hydraulic Conductivity in Reacting flow in porous media

Hello, Does anyone know if the hydraulic conductivity is still measured in the Reacting Flow in Porous Media node in COMSOL 4.3a? In a similar node in version 4.3, I could measure the hydraulic...

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What Physics I need for a liquid cooling problem with phase change

Dear everyone, I am totally new to COMSOL. Now I am working on simulation of a cooling system. It is a melted material thrown to another liquid (e.g. water). This may cause phase change of water from...

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Ejection step in injection molding

Hi, I am trying to simulating the ejection step of injection molding process using Comsol. After filling plastic into mold cavity, and packing stage, the solidified plastic part is ejected out of mold....

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Hagen–Poiseuille flow

I would like to use Comsol for a microfluidics project I'm working on. As this is my first time working with Comsol I am trying to simulate a simple problem to compare the simulation with analytical...

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charged particle tracing help needed

hello, i have a simple box with relative permittivity and electric conductivity = 1. with the mef module i created a magnetic field along the x axis with 10 A/m. i used a working plane inside the box...

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study computation

hi, suppose if i use 3 different studies for three physics in my model do i need to compute each study one by one or 3rd one directly..

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FEM error

Hello every one. i am new to this COMSOL and with the help some tutorial i learned how to use. i am much familiour with Matlab. i want to ask 1 question, which i am facing in my most of the models. let...

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Modifying the Fluid Flow Equation System

Hi everybody, Is it possible to change the fluid flow equation system in order to fit a logarithmic function in the derivative? I am currently using the earth science module to model a dual porosity...

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heat source setting

HI;I have a question that when I using heat transfer in solid and lamina flow model to simulate heating a crucible in a silicon furnace, when I setting the heat souce desity equal:6000W/m^3, the...

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Indetity pairs should be fixed?

hello I am running a static structural mechanics problem on comsol multiphysics 3.5 . I have a building and i want to see the effect of a seismic load on my structure .. My problem is that the building...

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Help solving nonlinear 1D diffusion equation

Hi All, I need to solve the following 1D diffusion equation on domain x=[0,0.4] between time t=[0,2]: w(u) du/dt = d^2u/dx^2 where w(u) = 1+184/u*(-1/log(u))^(4/3) subject to the initial condition...

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Heat Source Expanding with time!

I have a model for EDM process in which I need to put an heat source which would be expanding with time. But it shows error if I give time dependent position of a point under boundary conditions. Laser...

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script for exporting deformed geom from livlink matlab ?

Hi all, In GUI, I could remesh the deformed configuration from the results dataset, and from there i could export to a new geometry (xx.mphbin). But how can i do the same from matlab livelink ? I...

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how to calculate the parameter values of a curve edge in mesh file

Hi guys, I exported a mesh file from comsol. Can anyone tell me how to calculate the parameter values of a curve edge at two endpoints, respectively? Below is the mesh data of a circle: # Major &...

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Problem on Analytic function

I want to define analytic function E, which is a function to time, t, but when I want to plot out E(t), there is always a error, which is attached. Who can help me figure out what is the problem? t...

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width of PML

What will be the width of the PML( circular) to determine the confinement loss in hexagonal pcf. Regards Md. Samiul Habib

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Modeling a Sliding Constraint

I am trying to model a sliding constraint, basically a pin in a hole. To try to understand how best to apply the contraints I created a simple model of a tube and rod. The tube and rode are both 1 m...

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Heat Transfer Problem

Hi everyone, I found my heat transfer problem is taking too long to solve even in stationary. The problem is about a pair of thin pipes embedded in soil. pipe diameter 25mm, 20m long each. There is...

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