thermal BC's across the interanl surface between the heat sink and air in the...
n Model Library : Heat transfer module : Tutorial models: heat sink . It is considered the temperature filed is continuous across the internal surface between the heat sink and the air channel. first...
View Articlesimulating a rotating and moving blade
hi, i want to simulate a blade that is both moving up, down, front and back and also pitching at the same time mostly with time varying velocities. i know i have to use mesh deformation but i dont know...
View ArticleModelling of a permanent magnet
Hello everyone, I want to see the magnetic field lines from a bar shaped permanent magnet. I have created a rectangle and surrounded it with the air domain i.e a bigger rectangle. I have the following...
View ArticleError - Failed to evaluate variable jacobian
Hello, I am currently working with the batteries and fuel cells module and I am attempting to create a model of a micro-scale PEM fuel cell. Right now I am starting by just trying to solve a free and...
View ArticleMoving Mesh and Variable Knudsen Diffusion Coefficient during CVD
Dear Forum Members, I am trying to simulate oxide deposition inside a 100 nm pore by using a 2D axisymmetric model. The model is similar to a heterogeneous catalysis problem and the only modification...
View Articlefailed to generate mesh for face
hello, i imported a solid geometry to comsol, but when i generate mesh i get error: failed to generate mesh for face, i tried to make custom mesh for these faces, but did not solve the problem. can...
View ArticleTwo steps simulation
Hi, I am trying to model a variable capacitor, composed of a bottom (fixed) electrode and a suspended bridge. At the first step, I used DC voltage to make the fixed-fixed bridge deflects a certain...
View ArticleUsing a derived variable as an input variable for another study
Hi, I have searched through a lot of these threads but I can't seem to find a good answer. I have applied an oscillating body load to a resonating structure (Model 1) and I am able to plot the...
View ArticleRuntime of plasma simulation
Dear Sir, We have some test results as stated below after so many attempts on reducing runtime of plasma module for simulating a chamber with CCP type. a. We tested several cases (such as argon_gec_icp...
View Article2D patterns on 3D geometries
Hi, Is there any way to draw a 2D pattern on a surface of a 3D geometry in COMSOL 3.5(a). Suppose we have a block and on the top surface of this block we want to draw a 2D rectangle. Any suggestions?...
View ArticleCoupling Surface Charge Density from Electrostatics to Electrical Circuit
Hi, I have made a model of a varying overlap capacitor with an electric potential on one side as an electret. It seems to work with just ES and ALE but once I add in CIR and set the top electrodes as...
View Articlerestricted stress in time dependent problem
Hello evrybody, I m using a time dependent problem of a beam restricted at both ends. When we apply voltage or temperature, it produces stress greater than 500 MPa. Can anyone help me how to restricted...
View Articlevector form variables in PDE
What is the procedure to specify a dependent variable in PDE interface to be a vector rather than a scalar? In more specific terms, I'm trying to implement the vector wave equation in 3D using the...
View ArticleNeed Help: Solder Joint Estimation of Flip Chip
Dear All I'm a new for COMSOL. the case that i'm facing is a flip chip process. after read several samples, still could not figure it out what model/physics should to be used. hope to get some help...
View ArticleDeravites in 2D-axisymmetric models
Hi guys, I was wondering if we should add any extra parts for calculating the derivative of a variable in 2D-axisymmetric models? Under Definition ----Variables--If the goal is to define a new variable...
View ArticleDefining port, identity pair and PML layer
Dear Friend, Currently i am using comsol 4.3 version, i am totally new about it. could you suggest me how can i define port i,identity pair and also PML at same time in my model. it was works nicely in...
View ArticleThermoelectric Model
Dear All, I am looking to find and study example models relating to thermoelectric effect modeling using COMSOL. Does anyone have any reference source/model on thermoelectrics which could be used ?...
View ArticleDerivative of Interpolation Functions
Dear all, I am trying to understand if, given an interpolation function (defined by a table of points in an external file like *.txt file) it is possible to define the derivative (spatial) of the...
View ArticleAsk the question about the particle tracing module.
I have a question when I have used particle tracing module(fpt). Because I try to utilize the condition of Particle-Particle Interaction. I don’t know how to define the interaction force of particle. E...
View Articleconnecting solid and beam elements.
Hi, how can I use the beam element to act as a shear connector between two solid elements.
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