"Internal error in boundary respecting." and "Out of memory during assembly."
Dear All I have two errors in my microfluidic models about "Internal error in boundary respecting." and "Out of memory during assembly.". At first I tried to simulate the flow of the overall 3D...
View Articlemodelling galvanic corrosion
Hello all, i'm quite new to comsol. I'm working on a project that requires me to model galvanic corrosion. Please how do I go about it?. Thanks alot..
View ArticleDrop Test Simulation
Hello, I am a Mechanical Engineering graduate student and I wish to simulate drop test of a human head form. I have a few questions which I have enlisted below: Can this kind of explicit dynamic...
View ArticleHow can we determine magnetic field of a current carrying wire with finite...
Hi dear all users How can we determine magnetic field of a current carrying wire with finite length, and how it is possible to simulate it in time dependent domain in COMSOL. To simulate and obtain the...
View ArticleSolver settings for 3D k-e model
When faced with 100K DOF comsols defeault solver is a 1 or 2 level multigrid with GMRES as iterative and PARADISO as linear solver. Some papers on CFD and mass trasfer (such as the one by Birgit Stute,...
View ArticleHow can we determine magnetic field of a current carrying wire with finite...
Hi dear ivar can you please help me? I have big problem. How can we determine magnetic field of a current carrying wire with finite length, and how it is possible to simulate it in time dependent...
View ArticleParametric Sweep to Table
Hello all, I have an ODE (w.r.t. time) defined on a few points and if I run the time dependent solver, I can use a point evaluation --> table and export the data no problem. However when I run a...
View ArticleHow can we determine magnetic field of a current carrying wire with finite...
Hi dear Ivar Thank you for Kindness I used your advice and simulated my wire in mfh, and feed time dependent current to the wire with "external current density", but it doesn't work correctly. So I...
View Articleauxiliary sweep
Hello everyone, I am simulating a reacting flow with a rather fast reaction. This problem does not converge, and I found out that I should try an auxiliary sweep with a parameter in front of the...
View ArticleHow can we determine magnetic field of a current carrying wire with finite...
Hi dear Gunnar Andersson I wanted to simulate a time dependent current carrying wire for determining magnetic field around the wire. So in the first step, I simulated my wire in mfh, and feed time...
View ArticleHow can we determine magnetic field of a current carrying wire with finite...
Hi dear Magnus Olsson I wanted to simulate a time dependent current carrying wire for determining magnetic field around the wire. So in the first step, I simulated my wire in mfh, and feed time...
View Articleoutputs from mphgetu and mphmatrix
Hello, I'm looking at a time-dependent 1D 'Coefficient Form PDE' problem. I mesh the line with 4 element (5 nodes). So I have 5 degrees of freedom, the relevant system matrices are also 5x5. Also to...
View ArticleModelling laser ablation in COMSOL
Hi, I have a fairly simple question about COMSOL. I have made a model in which a block is heated by a pulsing laser heat source. I am using an iterative approach to solve it by solving for each pulse...
View ArticleMass Fluxes Does not Match on Boundary, and Different Results from Different...
Hi all, I'm currently modeling a mass diffusion problem, using Transport of Dilute Species and Laminar Flow modules. On the boundaries of two adjacent diffusion domains, I use the Stiff-Spring method...
View ArticlePeriodic flow condition
Hi, I am confused about how to use the periodic flow condition. I have a long and repeated geometry, and I want to model just one section of it (since it is repeated anyway). Geometry is very simple...
View ArticleHow to implement a biphasic asymmetric waveform?
Hello everyone. I'm trying to figure out how to implement a biphasic asymmetric waveform in Comsol 4.3a. I need to be able to use the following electrical simulator settings in order to stimulate an...
View ArticleProblems Solving Model - 2D Parallel Plate Waveguide w/Coupler
All, I'm trying to model a 2D parallel-plate waveguide that has coupling structures attached to the parallel-plate (very similar to conical horn antennae). I want to simulate the waveguide using THz...
View ArticleError in time dependent study when periodic electric current applied
Hello everyone, I think I somehow managed to define a periodic signal by combining a rectangle signal and an analytic function. In order to make use of this signal as an electric current input, I...
View Articlesaving in batch mode
Hello, how can I save the model file regularly in batch mode on Linux? Which option should I use in the command line? Thank you!
View ArticleTime variable fields involving nonlinear materials.
Dear Coleagues, I have been searching for time dependent solutions using a multi-turn coil and a nonlinear core. The geometry of the problem is a simple āEā structure and it can be shown in the...
View Article