stress 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 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
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 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 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 ArticleCoupling transport of diluted species and laminar flow modules.
I am trying to couple the transport of diluted species and the laminar flow modules. What am I doing wrong? I'm guessing it has something to do with my solver settings. Do I need to solve the laminar...
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 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 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 Articleheat tansfer in porous medias
Hello COMSOL users, I am training a problem of heat transfer and mass transfer in porous media, the medium consists of the wet fibers and particles of air circulating in the pore spaces I used the...
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...
View ArticleHow to identify boundary edges together
Hi, everyone, I'm new to COMSOL, so I'm still getting used to things, but I was wondering if someone could help me with identifying boundary edges. I've attached the geometry I'm working with right...
View ArticleReference Point for Moment computation
Hello, I am using the 2D beam module in order to model 2 structures A and B and to couple them together through 2 springs. The springs have stiffness in the x and y directions, but also a rotational...
View ArticleProgramming a constitutive equation?
Hello, I want to simulate the fracture mode using a specific fracture model and I don't know if it is possible to program different constitutive models in COMSOL. e.g. The Gurson model (One of the...
View ArticleRe-creating
Hello, I am trying to recreate a classic problem. I have air trapped in a box. The top and bottom walls are insulated. The left wall is at a fixed temperature of 100C and the right wall at 0C. Due to...
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