COMSOL in parallel mode: a speedup of 20% using 4 cores?
Hello everyone, I have performed the following experiment. Using the command -np #cores, I have forced COMSOL Multiphysics to use 1, 2, 4 or 8 of the available cores on my computer. I also used the...
View ArticleWater droplet falling through air on a structured surface
Hi, Im new to comsol. I was trying to model a water droplet falling onto a solid substrate. The droplet should fall through air and then i should be able to calculate contact angles at various...
View ArticleCan I pause the calculation and check the intermediate result?
Hi All, Can I pause the calculaiton of COMSOL and check the intermediate result? I would like to check if the intermediate result is reasonable or not. I don't want to only depend on the convergence...
View Articlewhy COMSOL is solving so slowly
Hi All, I am running a case with radiation heat transfer. The 3D geometry is quite simple. Number of degrees of freedom solved for: 56826 (plus 39748 internal DOFs), and element number is around 24K. I...
View ArticleHow to calculate the area or volume surrounded by contour ？ intop function
Dear All, I have a laser photothermal therapy model in which I coupled the bioheat equation with thermal damage equation (Arrhenius). The model consists of two regions, tumor and the body. The outputs...
View Articlefailed to evaluate variable
I am having the following while i am trying to compute the radar cross section problem "radar-cross-section-8613" provided in the model library. Each time i try to compute the following error message...
View ArticleYour invitation to the COMSOL Conference – Savings Deadlines ahead
Hello COMSOL Community, Join engineers and scientists at the COMSOL Conference 2013 to learn about cutting-edge research in multiphysics simulation. Your COMSOL Conference Invitation: Boston:...
View Articlesingle_turn boundary coil.mph in 3D frequency domain
Hello I was wondering if anybody has access to the following model: single_turn boundary coil.mph that in a new feature of 4.3b as described in the related highlights. I want to do the same thing in...
View Articleadding new property
Hi, How to add new property to the material such as Seebeck coefficient? This is not available in COMSOL property list
View Articlehow to calulate the size of the area
Hi,,recently ,when i finish my simulation,i want to calulate the size of the area bounded by a given contour,Could someone tell me how can i do that ?Thanks a lot.
View ArticleBoundary conditions / multiple dependet PDE (coefficient form)
Hey there, I am using the PDE coefficient form with 5 variables (u1, u2, u3, T, p) to solve a thermoacoustic problem in comsol. I want to implement the following BC to the whole geometry (sound hard,...
View ArticleSpecify inflow
Hi everyone! I'm dueling with a problem and I'm a very recent user of COMSOL so probably this is an easy thing but not that simple for me. So, I'm trying to simulate the flow of a specific amount of...
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 ArticleMultiphase Stirred Tank
Hello! I'm trying to simulate a stirred tank of water with air bubbles in 2D Axisymmetric model. But, In the bubbly flow module doesn't exist the condition "sliding wall" Can you help me with this?...
View ArticleModelling of a switched reluctance motor
Hi I'm a new COMSOL user(have the 4.0a version). I would like to model a Switched Reluctance Motor(attached picture). The design is rather simple. The stator consists of multiple salient...
View ArticleMagnetic field of permanent magnet
Hi, I'm trying to create a cylindrical neodymium magnet and visualize the magnetic field generated by the magnet on a normal plane. Anybody knows how to do this? Later on I intended to visualize the...
View ArticleError-System matrix is zero
Failed to find a solution. System matrix is zero. Returned solution is not converged. Can anyone please explain me about this error?
View ArticleNatural heat convection
Dear all I tried to model the heat distribution on the PMMA road inside the convection furnace for optical fiber drawing. The problem now I was enable to heat up the surrounding Air by the convection...
View ArticleEvaluation of global variables in comsol batch
Hi, I have 170 global variables defined in a structural mechanics model in model definitions --> variables. Each of the variables is a line integration process. When I evaluate them to a same table...
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