coupling model, extrusion 2D-axy towards 3D
Hello, Is it possible to re-use temperature boundary results of a 2D-axy simulation towards a boundary destination of a 3D model (4.3a version)? Which operator could I use if it's possible? Thank you...
View ArticleSegregated Solver, Segregated group
What is the meaning of "Segregated Solver" and "Segregated Group"? While computing for the results, I am getting a line like follows... "Segregated Solver 17% Step 3" . And the value beside Step in...
View ArticleAdapting transport of diluted species interface using mathematical PDE
Hello! I'm trying to adapt the transport of diluted species interface using custom PDE:s in order to open up for further modification later on. I have been trying to copy the functionality of the...
View ArticleE or E1 or E2 in my plasma model
Hello, I am trying since some days now to "copy" the microwave heated 2D model to a different geometry. My geometry is axial-symmetric in real. But I first started it in 2D only, but since I am not...
View ArticleHow to define Function in Definitions / Variables.
I'm currently working on electrical simulation using AC/DC module. I define nonlinear electric conductivity for zinc oxide material using following function(ZnO) in subdomain settings, but it shown...
View Articledomain deformation while doing moving mesh
Right now i am solving a moving mesh problem where the particle is moving in the domain. i have used moving wall and prescribed mesh velocity for the problem. It is doing fine for sometimes , however...
View ArticlePeak-to-peak amplitude in Comsol 4.3a ?
Hi I need to evaluate the peak-to-peak (pk-pk) amplitude of a voltage, which means the difference between the maximum positive and the maximum negative of a waveform. Are there any predefined function...
View ArticleHow to set displacement from study 1 as prescribed displacement in study 2?
Hey, I have a trouble with defining a prescribed displacement. Let's say that i received displacement of the edge caused by heating of sample. But displacement of this edge is different in every point...
View ArticleCompressible Flow
Hello , I have a simple question. What module should I use to simulate a gas flow in a tube.Something like the Pipeline Insulation in the Model Library but with a gas. Thanks,
View ArticleThere's pressure gradient, but no velocity, anyone can help me out? thanks
Hi, I'm using the Free and Porous Media Flow module to simulate the fluid flow on the particle level. I used it for 2D condition and it worked. When I switched to 3D case, something weird happened. I...
View ArticleOut of memory during LU factorization!! ( please help!!! )( muffler simulate )
Hey guys! I have a muffler that i will simulate by acpr interface. I used this pdf for do this job:www.mediafire.com/?zzvc170c23s3zvt I have a problem when i solve this projcet. i take a picture of the...
View ArticleSpatially graded index / graded material properties
Hi, can anyone of you tell me if it is possible to define a graded index in comsol? It seems as if sth. like this has been done in www.comsol.se/academic/papers/2871/ But how? Is it simply possible to...
View ArticleGeometric nonlinearity
Hi, I have used structural mechanics to simulate an indenting sphere on a half space polymer film. I am changing the elastic modulus of the polymer film to go from hard material to soft material. I am...
View ArticleModeling Jet flow of Water in Air Atmosphere
Dear All I am modeling the flow of jet (say water or similar liquid) in an atmosphere of air. The problem is very similar to the one in the model library (the inkjet example). However, my domain...
View ArticleMovement of air due to thermal expansion
Hi everybody! I'm trying to simulate the movement of the air in 2D and I only get errors. I use two physics: laminar flow with heat transfer. I've created a square full of air and I put easy boundary...
View ArticlePostprocessing in cyclindrical coordinates
I am doing a plane strain analysis of a pipe with a crack in it. I would like to get the stress components in the cyclindridcal coordinate system (radial, hoop stress) rather than in the cartesian...
View ArticleEigenfrequency seems right, but displacement units are totally wrong.
Dear Comsol Community, in the model attached I have a 20 micron long beam using the Solid Mechanics module to get the Eigenfrequencies. I calculated them manually using Euler-Beam theory and the first...
View ArticleProblems with sweep mesh
Hi, I have been trying to sweep mesh a domain (3-D). It will be like a small straight tube of rectangular cross section and having turns at right angles (like a serpentine). I tried to mesh the source...
View ArticleBasic issue with plotting derivative
Hi everybody, I am using the 2d structural mechanics for static simulations of a cantilever undergoing a point force. I want to plot the derivative of the deflection u by respect to the position x...
View ArticleStresses built up in a rotating disk
I am trying to analyze the stresses built up in in rotating disk. This disk is not subjected to any external loading. Only forces applied is centrifugal forces due to rotation. When I try to model the...
View Article