'Java exception occurred' error
I use COMSOL 4.3a with Live link for MATLAB The version of MATLAB is 7.10.0 (R2010a) Some times, irregularly, when I run m file with COMSOL live link for MATLAB, 'java exception error' occurred. I...
View ArticleLorentz Force calculation
I want to simulate the displacement of an current-carrying wire due to an external magnetic field, due to the Lorentz Force: vect{F} = I(current) * vect{l(legth)} x vect{B}. The geometry is 3D. I'm...
View ArticleLaminar flow
Hi I am modelling the flow of liquid alloy during casting process. In the laminar flow physics, I have used inlet boundary condition as velocity field with cast inlet velocity in x-direction, outlet...
View Articlestart a study from a solution solved
simple example: i have a component loaded by a positive pressure (+1) and when is loaded i need to put under another pressure (-3) so total shoul be -2. one model,2 phisics (solid mechanic) one with...
View ArticleNorton Creep parameters
Hi I 'm simulating the creep of polycarbonate part under a constant load and constant temperature during the time. I used the Norton model, but I've got some doubts about three parameters: stress...
View ArticleLiquid Crystal - Director distribution
Hello, I would like to calculate the director distribution of liquid crystals. The formula fs=1/2(K11*(div n)^2 + K22*(n * rot n + q0)^2 +K33* |(n x rot n)|^2) describes the Oseen-Frank free energy...
View Articleelectrospray simulation
Hi, I'm trying to simulate an electrospray experiment using comsol 4.1 in order to see the formation of droplets leaving a needle to a plate. A high voltage is applied on the needle and the plate is...
View ArticleMissing Infinite Element Domain
I cannot find the Infinite element domain node, which I thought was under Definitions. I'm using the Heat Transfer in Solids in the base package. If it is not available there, where could I find it?
View ArticleCOMSOL Releases COMSOL Multiphysics version 4.3a
We at COMSOL are proud to introduce version 4.3a of COMSOL Multiphysics to the COMSOL community See: www.comsol.com/products/4.3a/ This introduces: * LiveLink™ for Excel® * LiveLink™ for Solid Edge® *...
View ArticleDielectrophoresis
Hi there. I tried to observe the particle movement effect through the "particle tracing for fluid module". However, the result of particle trajectories didn't show up any particle movement. Please...
View ArticleCutting a simple geometry in half
I'm trying to cut a relatively simple 3D geometry in half. My approach is to first partition the geometry using a work-plane and then delete the entities that I don't want. Unfortunately, some parts of...
View ArticleAccessing database
Hello, Is it possible to access the database of a study and modify the value of a dependent variable? I am running v4.3b with Matlab. In my Comsol model, I have two studies; general form PDE and...
View ArticleHow to cut a geometry
Hello, I have a 3D geometry and I need to cut half of it to create a symmetry plane. Can you please describe the steps. Thanks. Regards, Dimitris
View ArticleIdentifying Acoustic Shape of Sound Localization
New to this forum. I am a researcher but limited in acoustic knowledge. Hoping you guys can help. Is it possible to identify the shape of a sound source? We are trying to identify whether the sound...
View ArticleProblem with Mesh Swept
There is something I don't get right with the Mesh Swept option. I used the model "biased_resonator_3d_modes.mph" from the Model Library as a starting point. There they built a mesh on one face of the...
View Articlelong running time
Hey: I hope you all are well, I have a question, when I run my model it takes lots of time to run and finally the analyses wouldn't be completed. and also no errors would be appeared. Now, I am not...
View ArticleVolume concentrations in transport of diluted species module
I am confused by the fact that the" transport of diluted species node" in COMSOL only lets me work with surface concentrations. I want to model a 3D problem that has a given volume concentration as...
View Articleproblem in inputting signal
i am working on SAW RFID using acoustic module with piezoelectric devices physics and i want to input a signal of type S= Acos(wt+p)rect(t/p) to the input IDT and i dont know how to do it .please help me.
View ArticlePointwise constraint in weak form
Hello, What is the meaning of the value of "Pointwise constraint" in Comsol? It is a strong, bidirectional constraint. If the constraint expression is "-x+1", then is the value of the variable "x"...
View Articledependent variables: sweep over "initial values" and "variables not solved for"?
Hello all- I have 2 Studies in my 2D model: Study 1 solves for various fields within my geometry. These fields are different for each wavelength (lam0). Study 2 takes the lam0-dependent fields from...
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