Joule 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 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 ArticleUltrasonic Atomization
Hi All, We want to simulate the ultrasonic atomization (Piezo electric transducers) phenomenon in the Acoustics Module. for (Experimental, and Theoretical) verification and validation if any one have...
View ArticleDifference between Time dependent and Time discrete
Hi, I am working on a conjugate heat transfer problem. By t=20s, the system reaches steady state. Then I would like to see the system response after t=20s, using step function to switch off a source...
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 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...
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...
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