Global variables to evaluate in Parametric Sweep
Does anyone know the syntax to evaluate the velocity at a specific point? I'm running a parametric sweep of my model and in my output for the "Globar variables to evaluate" portion I want to store the...
View Articlestress tensor-elasticity matrix
COMSOL assumes the elasticity matrix to be symmetric. I need to define an unsymmetric stress tensor but seems that it is impossible in COMSOL. Has anyone experienced such a problem so far? Thanks
View ArticleMicrowave heating module - Microwave Oven, time varying frequency source
Dear all, I'm almost new in comsol and I'm not very practice with this software. I'm training with the Microwave Heating module, in particular I'm evaluating the behavior of the microwave oven...
View ArticleExporting Specific Mesh Data
I am quite new to Comsol so please excuse my ignorance when trying to explain my problem. I am currently working with a model of a redox flow battery, and I am interested in exporting data such as flow...
View Articlepost processing (plotting velocity and ... vs length)
hi i am working on 3D blood vessel with non solid wall. i have finished the study part and now i have problem with plotting velocity , pressure and shear stress vs length. i wanted to attach the mph...
View ArticleRelation between the norm of a vector and its components
Hi, i'd like to know the relation between the quantities normJ and the components of the vector J (Jr, Jphi, Jz). I have simulated a coil group domain driven by a current of 10A. The components Jr and...
View ArticleHelp needed in Model:1852
Hi All I have been trying to build this model (HCCI combustion using COMSOL, model ID# 1852) using the PDF instructions, however whenever I am trying to compute I get the following error in the log...
View ArticleHow to interact a wave with object
How to interact Rayleigh wave with a object so that the wave will drive the substance loaded upon the wave generating substrate. How to introduce the dynamic equation to the model.
View ArticleThe difference between Impedance Boundary Condition and Magnetic Shielding...
Hi, everyone! I'm doing the simulation about Magnetic Shielding ,and I wonder what's the difference between Impedance Boundary Condition and Magnetic Shielding Condition? Both of them can simulate the...
View ArticleUsing interpolation functions.
Hi, I have a persumeably very simple problem when using interpolation functions. I have added two images to illustrate the problem. I defined a simple saw tooth interpolation function and now I want to...
View ArticleEarly Bird Abstract Deadline *This FRIDAY* for COMSOL Conference 2013 Rotterdam
Dear COMSOL users, We are less than a week away from the Early Bird Abstract Submission Deadline! Do you have any work using COMSOL you would like to present? Already I have received some interesting...
View ArticleBoundary conditions
Dear COMSOL Community, I am quite new in COMSOL world and I would like to ask some help for my problem. I am trying to simulate neuron behaviour. I started with a really simple model to see if...
View ArticleCutting a simple geometry in half
I'm trying to cut a relatively simple 3D geometry in half. My approach is to first partition the geometry using a work-plane and then delete the entities that I don't want. Unfortunately, some parts of...
View ArticleMoving Mesh - Thermal stress coupling
Hello to all, I need to perform an RF frequency domain analysis on a waveguide which has been previously deformed by a Thermal Stress stationary analysis. In order to do this, I need to calculate the...
View ArticleTime dependent boundary
Hi all, I have flow through a cylinder, and want the inlet velocity to be periodic [ u(r,t) ]. Im new to comsol and havent been able to find an answer to this. Thanks in advance for any help!.
View ArticleFailing to get ion-current in a microwave plasma
Hello, I am using the plasma module mwp in 4.3b. Microwave heated Plasma. Within this microwave plasma , I want to have a sample on DC bias.. This all looks nice.. but I am not sure I get current out...
View Articletime information of streamline
Hi I solved a laminar flow diffusion mixing stationary problem for a simple system. In the result I plot 1000 streamlines. I need to know the mixing time for every streamline so I have to get the time...
View ArticleInduction Heating, equivalent resistance
Hi, when I simulate an induction heating process the value of the equivalent resistance decrease over time. Shouldn't it increase because of the increase of the resistivity due to the increase of the...
View ArticleAC/DC Module Multiturn 1/4 , 1/2 symmetric geometery
I build a 3D model of my inductor in AC/DC module using multiturn coil domain but it took too much computational time that even 16GB of RAM was not sufficient. So Edgar suggested to use 1/2 or 1/4...
View ArticleLumped port in Joule heating
Hi, I want to study the distribution of heat and magnetic flux density of a structure. So how can I couple the AC/DC and the heat transfer modules? Specifically, I want to use the lumped port in AC/DC...
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