Sloshing Tank with FSI
Hello All I calculate the waves of a water tank and then damp with a structure the waves. At the beginning I start with a single excitation an then wait and just let the gravity do the job. My model is...
View ArticleIll Conditioned Preconditioner
Hi everyone, I haver been trying to untangle this ill conditioned error with different meshings, which I think is the cause of the error. The temperature distribution in the soil (from 3D plot group -...
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 Articlehow to make sure the soil is saturated
I am using poroelasticity module, how to make sure the porous media is saturated? is there any configuration to attain the totally saturated condition for porous media? thanks
View Articlewater flow in a hydrophobic tube
Hi, I want to simulate water flow inside a tube. This tube has surface tension of 30.35mN/m which is high hydrophobicity. For now, I only able to simulate just the water flow itself. I don’t know how...
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 ArticleHow to couple T variables in bluk and thin film
We are modeling heat transfer in solids that contain a thin film within the bulk. So we have "Heat Transfer in Solids" for the bulk, and "Thin Conductive Shell" for the thin film. The default variable...
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 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 ArticleContinuing Modeling Issues with 2D & 3D piezoelectric SAW model
Hello all, I’m in desperate need of help with my model. The initial model setup is a 2D cross-sectional SAW device where I have silicon, a metallic electrode as my ground, a buffer layer, a...
View Articleabout helix geometry modeling
Hi, I am trying to model a spiraling geometry (helix-like) with a complicated cross section. Does anyone know how to do it with comsol 4.2/4.3a? I used the build-in "helix" one but that was with a...
View ArticleImporting real data heat flux boundary condition to COMSOL
Hello all, I'm working on a 2D transient heat transfer project and I can't figure out how to import real data for heat flux vs.time in COMSOL. It only allow me to input a fix value or function, not...
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 Articlehow to draw a rectangle on a 3D cylinder's surface ?
hey ! we are working on the simulation of MEMS Based pressure sensor for biomedical applications. We are not able to create the heater element which will heat the liquid inside the cylinder. Kindly...
View Articlemode analysis for 2D slab waveguide
Hi, Everyone, I am new for using comsol, and firstly I built a easy model to learn. It is a 2D slab waveguide (see attached ). By mode analysis, I found the effective mode index obtained by comsol is...
View Article2D hinge in compliant mechanism
Hi all, I am trying to simulate a compliant mechanism as seen in the attached picture but I am having difficulties simulating the rotating pin in 2D. As see in the picture the structure is composed of...
View Article