Calculating the Electric Field by applying a potential
Hello Everybody, I want to simulate the following problem: I have a geometry (for simplicity assume it is e.g. a box) which is hollow (there is a vacuum inside), and the boundaries consist of some...
View ArticleJoule Heating - Resistive Heaters
Hi, I've built a COMSOL model that models the joule heating of electrodes that are designed to heat up channels in a microfluidic device. I am able to choose a V0 (input voltage) run a transient study...
View ArticleHow to use COMSOL batch to solve many files repeatedly without GUI?
Hi, When I open an .mph file with a given geometry and settings, then click "Solve", COMSOL creates the mesh then solves the problem. I would like to do this in batch mode (i.e., without GUI), however,...
View ArticleSimple heat module problem
Hello, I have been using COMSOL for a while now, but this is the first time I have had to use the heat transfer module. I could attach my model, but I feel the problem is simple enough not to require...
View ArticleConvergence criteria
I am trying to understand how COMSOL evaluates convergence criteria. My problem is non-linear and I am using a non-linear solver for it. I set the relative error to 1E-5. I now run the study. The...
View ArticleCan anyone help me with Transport of Diluted Species?
Hi colleagues, I am facing the problem with my project, and I would greatly appreciate if you can help me. In short, I want to plot concentration distribution in a microfluidic channel, and for that...
View ArticleHow to use COMSOL batch to solve many files repeatedly without GUI?
Hi, When I open an .mph file with a given geometry and settings, then click "Solve", COMSOL creates the mesh then solves the problem. I would like to do this in batch mode (i.e., without GUI), however,...
View ArticleGeneral question about multiple steps in solid mechanics
Hello everyone, I have what may turn out to be a question which makes me look like a dummy! I have been looking in the documentation for information regarding multiple steps in a simulation. For...
View ArticleMismatch between calculated answer from Comsol and Matlab
Anyone know why the result generated from Comsol (4.2) different from the result calculated by using Matlab? I am doing 2D mode analysis for photonic crystal fibre, i draw and defined all parameters...
View ArticleTrouble coupling heat transfer physics for both fluids and solids
Hey all, So I'm getting stuck with my model where I try to couple three different physics. The three physics are: Electric Currents, Heat transfer in Solids, and Heat transfer in Fluids. Basically what...
View ArticleLater version of COMSOL has robuster and stabler solvers
Dear all, I just want to share my recent experience with a convergence problem. During last several weeks I was struggling with convergence problem. The model has two 2nd-order PDE and Electromagnetic...
View Articlesegregated vs fully coupled solver in comsol
Hi All, I have compared these two solvers for a heat transfer case with surface-to-surface radiation. Acutually simulation results, i.e., temperature distribution in the domain, are quite different....
View Articleout of memory during assembly
Hi All, I am running a heat transfer with radiation, and the error message says "out of memory during assembly". Rigth now, I am using a workstation with 48GB memory. I check the element number, and it...
View ArticleAcoustic Band Structure of Metamaterials
Hi folks, I have been trying to find the band structure of an acoustic metamaterial. I have been attempting to adapt the "Bandgap analysis of Photonic Crystal" tutorial given for COMSOL 3.5a to 4.3. I...
View ArticleStructural optimisation
Hi, I am using a livelink from Solidworks to Comsol in order to import 3D geometry and quickly define some geometry parameters. I've made a structural analysis with applying torque load to my model and...
View ArticleMulti-steps simulation (100 and more)
Hi! Is there any way to optimize solver to solve hundreds of steps? I'm trying to simulate tunnel construction process and there is a lot of steps. Right now with standard settings at the beginning...
View ArticleAcoustic-Structure Model
Good evening, I am attempting to model the response of a fixed beam when driven by an acoustic source within a fluid. Initially, I used an eigenfrequency study and obtained results that make sense to...
View ArticleFailed to Evaluate Jacobian Variable
Dear COMSOL users, I am trying to model the electromagnetic heating stimulation for heavy oil reservoir (2D radial) to be further studied for my bachelor's degree thesis. The model is very simple. I am...
View ArticleFluid across cylinder with heat source
Hi! I am doing a small project about an heat exchanger. First I should study the Reynolds number effect and the vortex shedding. I already have some results about that (I should be able to calculate...
View ArticleCalculating the Electric Field by applying a potential
Hello Everybody, I want to simulate the following problem: I have a geometry (for simplicity assume it is e.g. a box) which is hollow (there is a vacuum inside), and the boundaries consist of some...
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