Velocity 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 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 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...
View ArticleThermal Stress Analysis
Dear all, I am trying to model and analyze thermal stress in a solid block sandwiched inside a Steel-press. The model is attached. As I used to work on CFD and I am fairly new to the FEA, there is a...
View ArticleHow do I do a plot of total plate stress against frequency?
I have a shell plate being driven by a point load and I already have surface stress plots that show stress at particular frequencies. What I'd like to do now is do a line graph showing total plate...
View Articlehow can I use plasticity model in the poroelasticity module
I want to use soil plasticity model in the poroelasticity module? How can I add soil plasticity model into the poroelasticity module? I notice I can add soil plasticity model in the structural...
View ArticleStep Function as BC
I want to implement a change in the velocity/flow in a laminar flow problem. I added the step function (tag: step1) but I am wondering what the correct syntax is when adding this in the velocity...
View ArticleConvergence: when should I stop the model?
Hi everyone I have been working on models that take several days to solve. One of them is running at the moment, and I just have a general question. When I look at the Convergence Plot 2, which is...
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