Post removed for no apparent reason
Dear administrators or moderators, i posted a Discussion the other day about getting wrong results in the AC/DC module and it was removed. Now, i just read again the "Rules and guidelines" and could...
View Articleflim2curve in comsol 4.3a??
Hi, I need to use the command flim2curve and solid2 in my code. Does COMSOL 4.3a have these functionalities?? If not, is there an alternate command to perform the same action? Thanks
View Article2D structure rotate problem
Hi, The question arises from the model "micromixer_particle tracing" in the Model Gallery. (Rotating Machinery, Laminar Flow)The impeller revolution per time is rotating at 1/s (constant velocity)....
View ArticleNorton Creep parameters
Hi experts/users, I'm going to simulate creep of polymer by using Norton model in situation which temperature and applied force are constant. I've got question regarding parameters in Norton creep...
View Articledynamic or static pressure?
For some reason, the question I asked in this forum yesterday was deleted, so I´ll post it again..... Hi, I have a simple "problem" when using the "free and porous media flow" physics. The pressure...
View ArticleCOMSOL 4.3b Product Booklet - New modules and features added
Hello, Check out the Product Booklet for version 4.3b at: www.comsol.com/offers/booklet In the tradition of every new product release, the Product Booklet has now been updated to include five new...
View ArticleGeometry Parametric sweep
Hello, I want to run a geometry parametric sweep. Consider the following geometry sweep parameters: H range(20[mm],10[mm],60[mm]) Z range(0[mm],10[mm],20[mm]+H) The idea is that Z maximum value is...
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.
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