Crack propagation with COMSOL
Hello, I am studying the possibility of acquiring COMSOL and I need to know if it is possible to solve problems of cracks propagation using cohesive elements, or if there are specific modules to solve...
View Article3-D Modelling , Filling an open gap
Good Afternoon, I'm building a damper that has a hollow casing and a rubber-ish inside. This rubber is applied inside the case trough a direct injection. I'd like to know if I can model the casing (...
View ArticleThermal stress analysis
Hi sir, i have analysed thermal stress by passing the laser beam on rectangular plate (through structural mechanics module).i used stainless steel temp dependent material properties to my simulation. i...
View ArticleCell Convection
Hello! I need some tricks to know how can I simulate my problem. I've got a rectangular cell ( 4cm height, 2,5 width, 3 mm thick) with a dilute suspension in it. I want to investigate the possibile...
View ArticleExtrapolating BH curve & Relative permeability
Hello, The BH curve from experimental data is normally in the first quadrant. When I extrapolate using the given methods, the extrapolated BH curve in the 3rd quadrant is unrealistic and am concerned...
View ArticleCOMSOL 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 ArticleVelocity gradient expression in 2D-axisymmetric
Hello, the velocity gradient tensor for a 2D-axisymmetric problem presents, for the phiphi component, the following expression chns.graduDGphiphi = if(abs(r)<0.0010*h,d(u,r),u/r) does anyone know...
View ArticleMultiple-size particle tracing
Hello everyone I have a short question on the particle tracing module. Does anyone know that whether it is possible to simulat particles of different sizes in the same model. How to implement this...
View ArticleElectromagnet modeling in 3D BH curve&relative permeability
Hi all, at start let me say I am new in Comsol. I am using v 4.0a AC/DC Magnetic Fields. What I am trying to model is type of a magnetic brake. It`s geometry is very similar to plain electromagnet,...
View ArticleMoving mesh ALE
Hi, I am simulating a moving boundary with ALE method. My program is working fine with a certain geometry, mesh and time, but if I would like to change the geometry or set a larger time, then I get a...
View ArticleGravity volume force in non-isothermal laminar flow
Hello I'm trying to simulate non-isothermal laminar flow through a tube, and I use 2D-axisymmetrical to decrease the computing time. The model works fine with laminar flow and heat transfer, but when I...
View ArticleResistivity change vs deflection
dear all, How to plot the resistivity change of a simple piezoresistor vs deflection of a membrane in a MEMS sensor? thanks
View ArticleFluid flow channel in cantilever beam
Hello, My model is the following: a cantilever beam has one longitudinal channel containing a fluid flow. My goal is to find the effects of the fluid flow (viscosity, velocity, size of the channel) on...
View ArticleHow to find temperature variation for a single element in my model
My model has 7 elements as a whole. I am able to plot the temperature variations of the whole model but not for any separate element in the model. I request if somebody helps me know how to plot the...
View ArticleProblem with air as a fluid ;-)
Dear sir, While solving my model, I am getting an error that the "Last time step is not converged" if the air is taken as a fluid whereas it is showing the results when air is taken as a solid. What...
View ArticleTem analysis-Joule Heating and Thermal expansion of wire
Tem analysis Hello, I was using Joule Heating and Thermal Expansion Analysis of Wire Bond. Basically, I would like to apply 2.1 Voltage to the wire and see displacement . However, I am not sure that i...
View ArticleHow to set a compliance current
Hi, I'm relatively new at Comsol. I am working on an electronic model of a NVRAM. I would like to clamp the current within my cell. But I cannot find a easier way than create a transistor that will set...
View ArticleSolve PDE on 1D domain?
Hy guys, I have a problem with solving a PDE based model defined by me, it is not a default template in COMSOL. My problem is that the equation is solved for the time domain, but not for the geometry...
View ArticleConvergence error using batch command line
Hello, I want to solve a single phase fluid flow, turbulent low Reynolds k-epsilon model in batch mode. This works fine when trying to run from the COMSOL desktop (i.e. with GUI). However when I try to...
View ArticleHow to combine the Frequency Domain and Coil Current Calculation
Hello everyone, i´m trying to simulate an numerical coil with alternating current. The coil is built with the "Multi-Turn Coil Domain". My coil type is numeric wich requires an additional "Coil Current...
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