Automatic Remeshing for Moving Meshes
According to the release notes, version 4.2 is supposed to have a new automatic remeshing feature for moving meshes:"For a simulation that includes a moving mesh, a new automatic remeshing feature...
View ArticleDeposition rate using particle tracing module
Hi I have modeled a reactor using the "fluid flow" and "particle tracing module". A substrate wafer is placed across the flow channel. I have implemented the boundary condition so that whenever a...
View ArticleState Space Export
Hi , i have build a simple cantilever beam model using time depented model. after defining the points of forces and parameters, i want to export the model to matlb (State Space Matrices) so i could...
View ArticlePacked bed mean field model
Hi, I am trying to solve the time-dependent concentration profile in a packed bed using the mean field theory rather than the whole CFD definition of the problem. The mass giving rise to the...
View ArticleRadiation heating
Hello, we are trying to solve the following problem: We have four radiant heaters on top of a rectangular cavity and two at the bottom. So, we could set up a symmetric problem two at the top and one at...
View ArticlePDE
I am currently working on COMSOL 4.0a. Can anybody tell me how the variables for stress are defined in COMSOL? Since I want to define a Coefficient PDE, which its diffusion coefficient (c) is coupled...
View ArticleBoundary error
Hello, I'm trying to calculate the electric field distortion produced by a water droplet, which I simulate as a half sphere. When depositing the droplet on flat surfaces, like the one shown on the...
View ArticleHow to write stop condition in solver
I am using a COMSOL V 3.5. I would like to use stop condition for time or temperature in solver parameters. Can you suggest me the how to write a equation for particular time or temperature? Thanks in...
View ArticleAcoustic transmission through periodic structures
In the underwater acoustic structure interaction problem I have done a @D problem in 3.5a version. When I convert this to 3D in 4.3b what is the periodic boundary condition to be given. In 3.5a version...
View ArticleAcoustic properties of a ventilation duct
I am trying to model a ventilation duct to try and and understand what happens to sound within a duct and when it exits the duct into a room. I am trying to look at the sound pressure variation and...
View Articleboundary condition dependent on dependent variable
Hello everybody, In a coupled heat and mass transfer problem, I would like a pressure BC to get updated at each time step. Let's call this pressure pv. pv depends on the temperature and pressure...
View ArticleConstant voltage at top surface of piezo
Hi, I want to apply compressive load on a piezo sensor (10mmx10mmx0.3mm) and ensure that its top surface should have constant voltage all along its area. How to ensure this constant voltage condition?...
View ArticleDielectric Loss in piezo sensors
HI, I want to give dielectric loss of 0.02 on a piezo sensor. I have tried by altering the 'dielectric loss setting' in 'model builder/piezoelectric devices/piezoelectric materials/damping and loss'...
View ArticleThick Cylinder under pressure
Plz tell me how can i model a thick cylinder under pressure as attached in the file. I made a 2D model, defined material, chose "solid mechanics". Applied a "boundary load" at inner circle boundaryand...
View ArticleReacting Flow in Porous Media
I am working on simulating a flow through a channel which is adjacent to a porous media which functions as an electrode to oxidize the electroactive species in the electrolyte (think fuel cell or flow...
View ArticleSimulating a rheometer
Hi Everyone, I'm a bit new to Comsol so sorry if this is a dumb question. I'm trying to simulate a rheometer in my lab. It's basically a cone in a petri dish. For simplicity I'm using 2-D and have...
View ArticleAccess depenant variable in Matlab code
Hi I am trying to develop a diffusion-reaction model using COMSOL - MATLAB interface. My model requires access to dependent variables during the execution so that they can be passed to an external...
View ArticleHow to calculate the reflectance and transmittance using scattering wave...
Dear communities: Recently I am trying to model my 3D periodic structure with COMSOL 4.3b. The periodicity of my sturctuture is 1.5um, but the incident wavelength can be as low as 400nm, so that the...
View ArticleModeling magnetic nano-particles in a fluid
Hi all, We wants to model magnetic nano-particles in a fluid (fluid velocity is 0). We don't know which model to choose in the model navigator, and how to create a nano-particles. Thanks
View ArticleFailed to find consistent initial values.
Hi. I coose frekvenci transient study and get thise error. Failed to find consistent initial values. Last time step is not converged. THANK
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