start comsol server on cluster on multiple compute nodes
Dear, I would like to run the comsol server on multiple nodes, with each 8 cores, on a linux cluster. For this I use the following command in a PBS script: comsol -nn 1 -np 8 -f ${PBS_NODEFILE} server...
View Articledialysis
Hi, I have got the attached model on dialysis process at COMSOL site. I have some questions regarding the solver. As you can see, under the "Stationary Solver 1" there are two nodes- Fully Coupled and...
View ArticlePlot of Temperatures for a Time Dependent Step
Hi, I was running a case last week that included several physics, including heat transfer. Just by chance, I looked at the computed temperatures at the end of a steady state step and again at the start...
View ArticleVariable modifications between solution iterations
I'm developing a transient model using the Livelink interface. The model first calculates an initial solution for the first time window, then I would like to modify the state variable values due to...
View ArticleCOMSOL Releases COMSOL Multiphysics version 4.3a
We at COMSOL are proud to introduce version 4.3a of COMSOL Multiphysics to the COMSOL community See: www.comsol.com/products/4.3a/ This introduces: * LiveLink™ for Excel® * LiveLink™ for Solid Edge® *...
View Articlebuilding piezo ring projector (electroacoustic transducer)
Hello, I plan to build piezo ring projector, but I don't decide to build it as 2d axis symmetry or entire 3d model. My electrodes would be located circumferentially. 2d model would be problem because...
View Articlehow create solids
Hi, I imported two objects as .stl files: the topographic surface-imp1 (see figure topo.png) and the top of a geological unit-imp2 (see figure top.png). Finally, I added a block-blk1 (see figure...
View Articleoxygen dc discharge
Hi I have simulated oxygen dc glow discharge for a month,but not success. I use the model of positive_column_2d in the model library and change Ar to oxygen.The reactino and date come from...
View Article3D Multi Turn Coil
Hi, I just started to play with the magnetic physics and try to build a 3D power inductor using multi turn coil but the model won't converge. I am not sure where it went wrong. Can anyone help me?...
View ArticleTime dependent adaptive mesh refinement
Hi I'm trying to make a CFD model where the flow is driven by the motion of the walls. To do so I coupled a moving mesh and a laminar flow model. First I solved a simple geometry using 2D axial...
View ArticleAre all post-processing function only using single CPU core?
Hi all, I'm doing 3D eigenvalue simulations. I noticed that I can used pardiso direct solver to take advantage of multi-core CPUs. However, when I went to the point of post-processing, e.g. exporting...
View Articleabout doubt about amgnetic ferrite core
Dear all , i have small doubt , how to apply ferrite core to coil and model the geometry , in attached model , i created a rectangular and iron and renamed and changed a relative permeability of 1500 ,...
View ArticleTemperature discrepancy
Hi, I am modeling a simple conduction problem in solids. When I model my geometry as a unified body, I get a maximum temperature of 358. But when I split my geometry into subdomains and define a heat...
View ArticleError with particle tracing
Hello, I´m trying to solve particle tracing on a previous resolved velocity field using massless formulation. Whenever I try to run it get error messages, I suspects it comes fromo a bad implementation...
View ArticleAdsorption model almost working!
Hi there, I'm trying to design a simple model. There's an inlet concentration of a species "cp" that will be adsorbed to a circular surface located at the center of the microfluidic cell (I named the...
View ArticleRotation
Hello, I am trying to allow the remanent flux density within a magneto-active elastomer (MAE) to rotate with the elastomer as a magnetic field is applied to the material. Within the ampere's law that...
View ArticlePZT/piezo material properties
Hi, I am working in version 4.3a structural mechanics module with Piezoelectric Material Model. I am a little confused about which material properties are which in the matrix. The input field for the...
View ArticleNVIDIA driver 305.93 causing erratic behavior
COMSOL was working great until I got a Tesla NVIDIA GPU. After installing the driver NVIDIA 305.93 I started getting erratic behavior when mouse clicking on the graphics. When I click to highlight a...
View Article[Solved] Selection Left Click
Hello community, I am faced with a strange problem. I just updated to Comsol 4.3 after using 4.2a for a long time. But it seems I can't left-click on an object to select it anymore. I don't know...
View ArticleSwitched reluctance motor - rotor and stator deformation - How?
Hi. I am building a 2D model in which I would like to showcase how the stator and especially the rotor of a switched reluctance motor deforms because of the radial and tangential magnetic force on the...
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