Inconsistent uni-directional constraint with Conjugate Heat transfer
I am trying to model a simple high temperature hydrogen heat exchanger with the conjugate heat transfer module. While I have been sucessfull in modeling individual tubes of the hydrogen alone, I cannot...
View ArticleHow to implement a biphasic asymmetric waveform?
Hello everyone. I'm trying to figure out how to implement a biphasic asymmetric waveform in Comsol 4.3a. I need to be able to use the following electrical simulator settings in order to stimulate an...
View ArticlePMLs in the Mathematics (PDEs) Module
Hi all, I'm having trouble making PMLs work in the PDEs module. I'm just working on a toy model at the moment - the diffraction pattern example from the model library but with a PML on the outside of...
View ArticleAdding a Faxen Force on Stokes drag force in Particle Tracing Module
Hi everyone, I am trying to use the particle tracing module with a non-uniform laminar flow in a channel. I am using "Drag Force" to trace the particles' motion. However, the Stokes force is defined...
View Articleerror in pulsatile waveform stenosis
hii, I am solving pulsatile waveform for velocity inlet in Steonsis. As the waveform is regular so i have to cut into 3 pieces and used interpolation to get equation for them. I assign 3 equations of...
View ArticleMeshing Error
Hello everyone, i want to attach the electrodes to the boundary of my model , but when i am try to mesh or add the sub domains, it shows me error"Could not resolve subdomain relations" could you please...
View ArticleFailed to find the consistent initial values
Dear sir, I am getting an error after solving as follows"Failed to find the consistent initial values Last time step is not converged. - Feature : Time - Dependent Solver1 (sol1/t1) - Error : Failed to...
View Articlesolver
sir Is there is any option to use two parametric values while solving. I want to change frequency and resistance
View ArticleError when Maxwell stress is used as boudary condition for Structural Mechanics.
Dear all, I am working on a Synchronous reluctant machine model in which I want to simulate the effect of the magnetic force on the iron core of the machine. First, I made a rmm physics where I define...
View ArticleFinal electric displacement and remanent electric displacement
Deal All I am solving electrostatic problem using Electrostatic module. I used remanent electric displacement option from the constitutive equations D=E0*Er*E + Dr E0- permittivity of free space Er...
View ArticleChange in Eigenfrequency due to added mass
Hello everybody, I have a very simple doubt, which is as follows. I have calculated the Eigenfrequency of a clamped plate. Now, I would like to add another body, which has a definite surface and...
View ArticleHTC calculation
Hi, I'm trying to simulate a model of heat transfer between two solids. I have, through experimentation, data on the variation of temperature at different points, density, etc. Is it possible to...
View ArticleParallel computing MatLab Comsol
Hi, I am using Comsol 4.3 with Livelink for Matlab. I run an optimization code in Matlab where i call Comsol to perform frequency response simulations. Now i would like to start two parallel frequency...
View ArticleStraw Poll: Who would like to see the model gallery documentation overhauled???
Hello all, I thought I'd post this here to get the community opinions before suggesting it to support. If I want to learn how to use an aspect of Comsol I work through example models and I visit the...
View ArticlePlasticity
Whats the difference between Small Plastic Strain and Large plastic strain? How is a model with contact and friction to simulate? What is important? My models usually have convergence errors when I...
View ArticleMoving Mesh problem/ Electromagnetism / Induction heating of rod
Dear Ivar, I am working over a problem, induction heating of a rod moving inside the furnace with a certain velocity, required to relieve stress from the surface. The furnace is stationary, means the...
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 ArticleAveraged flux
Hi, how to average the time-dependent diffusive flux for pre-defined time intervals at a domain boundary and allocate those (averaged) values to the arithmetic mean of the time intervals? The...
View ArticleCOMSOL 4.3 with MATLAB error
I have a problem with COMSOL 4.3 with matlab simulation. The error message is below. ??? Java exception occurred: Exception: java.lang.RuntimeException: java.lang.reflect.InvocationTargetException...
View Articletransient heat flux and temperature analysis
Dear all, I am very new to COMSOL multiphysics. I am doing a transient thermal analysis on geometry containing ceramic and aluminum blocks. for the boundary conditions I need to define volumetric heat...
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