Modelling 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 ArticleMagnetic Force on an armature
Hello I'm dealing with a very simple problem that has been very frustrating for me! I would appreciate if any one can assist me with that. I'm modeling an E-shaped core in 2D magnetic field module. It...
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 ArticleTime integration in comsol 3.5a
Hi everyone, I am just wondering if there is a time integration function in comsol 3.5a. I am calculating fluid flow rate through a boundary and which is a function of time and I would like to...
View ArticlePhysics for a elastomeric vibration isolator.
Good morning. I'm almost finished with my model. The model consists in : 1 - Base. ( Base ) 2 - Elastomeric Rubber. ( Borracha) 3 - Lid. (Tampa) 4 - Screw Hole.( Parafuso ) The Screw Hole receive 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 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 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 Articlesome problems about cantilever under Electrostatic force + contact
Hi, When I simulate cantilever bending under electrostatic force with COMSOL, there are some problems and errors I can not fix. Could someone please give me advises? I attach my file. (1) When the...
View ArticleHow to calculate the water saturation in the period of water injection to...
I just start to learn COMSOL4.2a.I want to simulate the process of water injection in oil production. Two phase darcy flow is applied in reservior.When water is injected to the reservior at the...
View ArticleAmazon Instance with Comsol
Hi, I knew this topic has been mentioned before in the forum, but I cannot find a definite answer. Has anyone been successful to run comsol on Amazon instances? Is there a detailed guide on this topic?...
View Article