Movement 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 ArticlePressure boundary conditions
Hi All, I am working on a coupled problem involving a piezoelectric and fluid.....I need to apply the pressure from the piezoelectric after each iteration step and apply it as a pressure boundary...
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 ArticleSloshing 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 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 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 ArticleI want the optimization solver to evaluate the objective at all time steps
Hello, I am using the optimization module in conjunction with the Heat Transfert in Solids and the Solid Mechanics. After computation, I always get the warning message: ' The objective is only...
View ArticleSame model but Convergence Problem
Hi I have a model (using solid mechanics and heat) which is setup in 4.2a and I get excellent convergence. I have alos setup the exact model in 4.3a no changes been made in any boundary conditons or...
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 ArticleUse of Ports to calculate the Transmittance and Reflectance of an array of...
Hi everybody, +Problem: I want to simulate an square array of gold nanorings, in order to get the graphs for the transmittance and the reflectance and find the resonant frequency. +My first approach:...
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 ArticleNot able to properly use remesh feature in multiphysics stationary simulation
Hi, I have simulated a steel specimen that becomes deformed due to bending. For that, I use the solid mechanics interface in a stationary study. Parametrizing the magnitude of bending also works....
View Articlestress corrosion cracking
Is it possible to be stress corrosion cracking? The steel structure has tensile stresses and would be susceptible to stress corrosion cracking. Thanks -- Arthur Rupel
View Article"comsol batch" crashed with Java errors
Hi, I am trying to run a CFD model using the batch mode but crashed with some Java errors. The same model runs fine using the GUI (comsol client) and a Comsol Server. OS: SLES 11 COMSOL version: 4.0a...
View ArticleSImulation of an electrostatically actuated beam
Hi, I am new to COMSOL and presently trying to simulate the pull-in instability of electrostatically actuated micro beams in COMSOL MEMS module. I need further insights into the following topics...
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