Using Quarter Symmetry
Hi I having problem using symmetry to simulate my model. For example I have a 3D ring and I want to use the quarter of the model to reduce the computation time. But how to use the quarter of the ring?...
View Articlecomsol 3.5 Capacitance and permittivity calculation
Hello everyone, I 'm new to comsol and I've been trying to model a simple parallel plate capacitor with a mixture as dielectric. I wish to obtain the effective permittivity value of the mixture. Since...
View ArticleHelp me! Error"Internal error in boundary respecting."
Hi, all I want fix it, It is coordinate (-2,06378, 1,35209, 2,8034) Thank a lot Vinh Nguyen
View ArticleHow to measure the distance between two objects in COMSOL
Hi All, Can anyone tell me how to measure the distance between two objects in COMSOL, such as the distance between to surfaces, distance between one surface to another body? Thanks.
View ArticleHelp with the Laplacian definition (second derivative)
Hi I want to do the laplacian of the hydrostatic pressure, which I've defined as the trace of the stress tensor / 3 (solid.I1s/3), but i've a problem,when i define the following expression :...
View ArticleTorque in Stirred Mixer
Hi all, Can someone help and tell me how to calculate torque in Laminar Flow in a Baffled Stirred Mixer model? Thanks a lot.
View ArticleModeling nanoparticle heating
Hi, How do i model multisource nanoparticles heating in COMSOL.
View ArticleOptimize time of simulation
Hi! I'm simulating a grounding system with AC/DC model of COMSOL v4.3 and having trouble with simulation time. I use more than 100 probes and constant time step. In the initial micro seconds the...
View ArticleHelp: Why is Initial value changed after calculation?
Hello, everyone. I build two models （both are PDEs）in one file. For the first one, initial value is A0, a log-normal distribution. For the second one, initial value is B0, also a log-normal...
View ArticleHelp: Why is Initial value changed after calculation?
Hello, everyone. I build two models （both are PDEs）in one file. For the first one, initial value is A0, a log-normal distribution. For the second one, initial value is B0, also a log-normal...
View Articleproblem with selecting the domain, boundary or edge
Hi All, I don't know if you guys have encountered such problem: when I try to select the domain, boundary or edge from the graphic window, I cannot select anything. It seems that the selection by...
View Articlesoil plasticity in poroelasticity
I am doing a project using poroelasticity interface, but I wan to consider plasticity behavior of porous materials, so I need to use plasticity constitutive model for porous materials. How do I add...
View Articlejava.lang.ClassCastException when using LiveLink from MATLAB
Hi there, I've been successfully using COMSOL and LiveLink for a few months now for generating and simulating electromagnetic models. However, yesterday I ran the same MATLAB code as I always do, but...
View ArticleMaximum number of Newton iterations reached
I have imported a 3D meshed model from simpleware to COMSOL 4.3b. Some of the materials of the model are Hyperelastic, Neo-Hookean. While running the model via Direct Solver at 99% of progress there is...
View ArticleOil Tank wtih heater
Hello, I am a new Comsol user. I am trying to model an oil tank heated by a U heater.The heater use oil at a higher temperature. The cold oil in the tank is at 30°C and the hot is at 250°C.I use...
View Articlecreating plots is extremely slow
Dear Forum, creating simple line plots (with global scope) of model results is extremely slow. For quite large model files (2-3 GB of size) it sometimes takes several hours for one simple plot on a...
View ArticleSelecting a point
I want to get the co-ordinates of an arbitrary region within my model so I can see how the pressure changes at that point. Does anybody know how to do this?
View ArticleAC/DC module ground problem
Hi i am new to comsol, i am working on an electrostatic, I want to get the electric field due to a charge distribution, but when i work without ground, i got an unexpected solution totaly, and when I...
View ArticleHow to use Two Different Times steps in Solver Parameters?
Dear Sir, I am using COMSOL 3.5a. And I am running my simulation for 6hrs. But I want to run my simulation in two different time parts. (i.e. for 1hr i used solver parameters for time stepping range is...
View ArticlePhase change: freezing and convergence problem
Hi, I'm currently working on a water solution freezing model including the phase change. I use the COMSOL model : www.comsol.com/model/phase-change-474 Geometry: I just add a metal part below the...
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