Simple 2D model
Hi everyone! I am new around here and I have to solve this problem: I have to model human skin with two electrodes on top. Skin has 4 square shaped layers, different permitivity and conductivity....
View ArticleElectric Field Simulation Problem
Hi, I am trying to create a plot of electric field, but i failed to do it. I created a simple model of column, and I used the physics of "Magnetic and Electric Fields". I defined a electrical potential...
View ArticleCUDA and COMSOL
Dear all, I have a new NVIDIA Quadro GPU and I would like to use it to accelerate my simulations, is it possible to use it somehow? I looked for some informations and it seems to me that CUDA it's...
View ArticleLine Graph using expression for x-axis
Hi, I am doing magnetic field simulations to validate analytical models. For this I need to have the line graph of the radial field in the airgap for example. This works fine, as long as I plot it over...
View Articleosmotic pressure
Hi all, we're two Politecnico di Milano's students using Comsol software (4.2a version) for our master thesis. On the Comsol webpage we've found an article of S. A. Conrad "Finite Element Analysis of...
View Articleload two models in the Matlab Livelink
Hello; I am new in Comsol and Matlab Livelink. my question is how can I load two models in Matlab Livelink? For example I try to run the following sample code, but it generates error which I am unable...
View ArticleHow to Generate Smooth Molecular Surface with COMSOL
Hello folks, I have COMSOL 4.3a and LiveLink for Matlab with me. And I have constructed a protein subunit of about 1000 atoms based on the coordinate data in the PDB file. I simulated each atom as a...
View ArticleSum of forces on model edge
Hey I'm having problems and I hope you guys can help me out. I'm looking for a way to sum up each force in a specific direction for the mesh nodes on a given edge. To refraise, I would like to find the...
View ArticleGhost domain, bug?
I have a curious problem with Comsol (4.3b and 4.4) with ghost domains. If i look at the geometry and select all domains, i have, ie 10 domains. When assigning materials, then the 11th domain appears...
View ArticleSimulating a MOSFET with silicon nitride as gate dielectric, using...
Undefined value found. - Detail: Undefined value found in the equation residual vector. There are 24 degrees of freedom giving NaN/Inf in the vector for the variable mod1.N. at coordinates:...
View ArticleAC impedance of a dipole
Hello, I am at the moment trying to simulate a simple system and I am having a few problems. I am trying to calculate the self impedance of a dipole located inside a full space of conductivity 0 and...
View ArticleNon-zero electric field at the center of disc
Dear All I am doing electrostatic simulation using the 2D electrostatic module. In my geometry I have two discs forming core-shell structure. Then I inserted remanenet dielectric field displacement...
View ArticlePlasma Module Error: Failed to Evaluate Variable Jacobian
I am attempting to model a DC microdischarge in Argon using COMSOL 4.2. I am using a 2D axisymmetric model. The top layer is the anode, the middle layer is a dielectric and the bottom layer is the...
View ArticleThermal structure interaction
Hello, I was watching one of the webinars and was trying to build a model similar to the following: www.comsol.com/video/thermal-s...eraction-mems-energy-harvester I have set up the model but I can't...
View ArticleHeat transfer setting temperatures not affected by material
So when I do a heat transfer (stationary, 2d), I have a rectangle and I set the top and the sides to 300K, and the bottom to 600K. Then I do temperature profiles of these conditions for two materials...
View ArticleSImulation of an electrostatically actuated beam
Hi, I am new to COMSOL and presently trying to simulate the pull-in instability of electrostatically actuated micro beams in COMSOL MEMS module. I need further insights into the following topics...
View ArticleStep Function as BC
I want to implement a change in the velocity/flow in a laminar flow problem. I added the step function (tag: step1) but I am wondering what the correct syntax is when adding this in the velocity...
View ArticleBaw Resonator Problem
Hi I am working on a baw resonator. For our simulation we have considered a 3.5a COMSOL 2D model of Thin Film Bulk Acoustic Wave Resonator in the model archives of COMSOL. So we treid to simulate the...
View ArticleRemeshing of Deformed Geometry
There's a deforming part in a geometry with an edge moving downsides and the others hoding their position. After I defined the free deformation part and prescribed the mesh velocity, and run the model....
View Article2 Separate Stranded Coils in Multi-Turn Coil Domain
Hi all, I have 2 separate stranded coils to be modeled for transient behavior (Current Pulse input). Since these coils are not of regular shape (linear or Circular), i had to go with numeric coil type...
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