Lift and Drag coefficients - 2D stationary turbulent k-epsilon flow
Hello, I am starting with COMSOL, and I have made a 2D flow simulation around a multi-element airfoil for a project at school. I used a turbulent k-epsilon flow for my model. After reading multiple...
View Articlesolution does not converge when using more intensive mesh
Dear: I am making a 2d model about laminar flow around a plane. When I use better mesh, the solution does not converge. It works quite well using not so intensive mesh. Can anybody explain this to me...
View ArticleExcavation process - time dependent
Hi, I am trying to model a real-time excavation of a borehole. Assuming that at the time t = 0, the drilling begins and at time t = 1 day, the tunnel advancement is 1 m (drilling velocity = 1m/day)....
View ArticleHow to make sure AC/DC and Structural models are coupled? SIMULATION ATTACHED
I'm doing my thesis on the magneto-mechanical coupled analysis. The attached file is only a simple example showing what I want to do about magneto-mechanical coupling. I chose to use the AC/DC model,...
View ArticleCOMSOL Finite element parameters
Does anyone know the meaning of two parameters, Physical Width and Pole Distance defined for infinite element domain? Or if possible, can anyone provide a reference? Thanks!
View ArticleRigid connector equivalent in 4.2a
Good day i am using version 4.2a but the tutorial i am using is for 4.3 and it says to find a rigid connector in solid mechanics. I need to apply a torque to a fillet bar,what is the equivalent function?.
View ArticleCan I use "soil plasticity" in the poroelasticity module?
Can I use "soil plasticity" in the poroelasticity module? Because I want to consider plastic behavior of soil when I am using poroelasticity module.
View ArticleFracture flow in a single fracture
Dear Comsol community, I've been trying to model fracture flow in a porous media and I've encountered a big problem. I'm trying to simulate flow in a fracture. I've modeled a well pumping at the rate...
View ArticleHow to see the plots after running in batch mode?
Hello! I managed to get comsol to run in batch mode (Linux). However, after I open my newly created output model file out.mph, I do not see any graphs available. I am solely interested in CFD module,...
View ArticleElectrical Circuit and Comsoll
Dear memebers I Work with Comsol 4.3 ACDC. I know now how to import a SPICE Netlist to Comsol.But I still have a problem. I followed the exmaple in ACDC modul called "inductor in a Circuit". So to be...
View Article[Batch Run on Linux Cluster Problem]
Hello, I am currently trying to run COMSOL/4.3a in batch mode on our university cluster. I am able to submit the job and pull it back after computation. However, although the size of the *.mph has...
View ArticleHow to 'fill' the space between two parametric curves.
Good morning, I'm trying to make an S shape drawing to my model that consists in two rectangles and 4 parametric curves ( forming 2 semi-circles). But when I make the extrusion the parametric part of...
View Articleheat exchanger
Hi Im trying to model a heat exchanger under Conjugate Heat Transfer module but i got an error. I attached the file. Would you please look at it and let me know where is my problem? Regards
View ArticleSliding boundary conditions in Solid Mechanics
Hi! I am trying to model a sliding boundary condition between to elastic bodies. By sliding condition here I mean, that the DIFFERENCE between the displacement fileds should always be zero in the...
View ArticleDifference Between Fixed Constraint and Rigid Connector .
Whats the difference between fixed constraint and rigid connector ?? I'm trying to simulate a Frequency Response Analysis on a Aluminum Box that has a 'shaker' on it's lid and the lid is fixed to an...
View ArticlePolynomial Issue with User-defined Variables
I have a 2D rectangular geometry that has porosity and permeability values dependent on x-coordinate. Polynomial expressions are used to define the local porosity and permeability. However, COMSOL does...
View ArticlePML for infinite layered films
Dear folks, I am trying to simulate a point source illuminating on a stacked films extending to infinite. A intuitive way to truncate the film, I think, is to use PML. However, when extending the...
View ArticleUse eigenfrequency found in study 1 as a parameter in study 2
Hello all, My simulation is divided into 2 studies: Study 1: Eigenfrequency (model: solid1) Study 2: Frequency domain (model: solid2) Have you an idea how to use one of the eigenfrequencies found in...
View ArticleWhat COMSOL Module is Needed for a "fluid-structure interaction" model?
Just a quick question here... What COMSOL Module is Needed for a "fluid-structure interaction" model? Can one perform this is the "Microfluidics Module"? Or, does one need the "Structural Mechanics...
View ArticleInitial Concentration in Reacting Flow in Porous Media
Hello, I need to know if I can add a starting concentration for a variable in the Reacting Flow in Porous Media, that will then change via the Reactions Node. The Initial Values Node does not seem to...
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