Bandstructure of 2D solid-fluid phononic crystal
Hi all, I am trying to obtain the band structure for 2 dimesnional phononic crystal composed of liquid (water) cylinders in Al through the acustic-structure interaction model in COMSOL 4.3a. Although...
View ArticlePiezoelectric Devices, Surface Charge Density,Zero Charge and Current Density
Hi all I have designed a 100.1 MHz surface acoustic wave (SAW) device on YZ Lithium Niobate in 2D and 3D using Piezoelectric Devices module. I need to analyze the Surface Charge Density and Current...
View ArticleOscillation of an air bubble in microfluidic channel
Hello, I am currently trying to simulate oscillation of an air bubble inside a microfludic channel, using pressure acoustics study. More specifically, I would like to observe displacement of an...
View Articlescattering of a sphere and compared to analytical solution
Hi everyone I was trying to work on the model which appears in the Model Gallery "Acoustic Scattering Off an Ellipsoid Model ID: 12417" to describe the scattering of a solid sphere, but I got some...
View ArticleSurface acoustic wafe sensors - Out put voltage
Hi Is want to simulate a Surface Acoustic Waves (SAW) device. For reducing the problem complexity, I work in 2D in the plane cut indicated in the figure here below (top view of metal lines). A floating...
View ArticleAcoustic sine wave source
How to give acoustic sin wave of specific frequency from a point source?
View ArticlePoroelastic waves - acoustic module - material definition
Hi, I would like to model a poroelastic material with the acoustic module. However, can you tell me how I can link my parameters to material proporties. My parameters are : - porosity - tortuosity -...
View Articlecapacitive transducer, Harmonic Perturbation problem, output pressure
Hello,everyone I'm trying to simulate a capacitive transducer to get the ultrasound with the vibratng membrane. In the begining I use 2D axial symmetry, MEMS module, Pressure Acoustic,Frequency Domain...
View ArticleHello, Mr Wen, may I ask you a few questions please?
Hello, Mr Wen I think you are a Chinese, right? I have seen your question about Harmonic Perturbation. Have you make it? may I ask you a few questions please? my email: ascxw2008@gmail.com
View ArticleHello, Mr Wen, may I ask you a few questions please?
Hello, Mr Wen I think you are a Chinese, right? I have seen your question about Harmonic Perturbation. Have you make it? may I ask you a few questions please? my email: ascxw2008@gmail.com
View ArticleHow can we use Poroelastic Wave Interface to simulate waves in partially...
Hello everyone, I have a question here: How can we use the Poroelastic Wave Interface to simulate wave propagation in partially saturated porous media in COMSOL Multiphysics ? Biot's theory is...
View ArticleLoudspeaker Modelling
Hi, I have a simple cabinet with a port on the front face. I then have half a sphere normal to the front face acting as the air domain. Firstly, how can I look at the modes inside the cabinet? Using...
View ArticleCircular variable dependency detected
Hi, I am trying to solve a problem of a 3D acoustic perforated panel under un incident plane wave. When running the simulation, i get this error:"the following feature has encountered a proble:...
View ArticlePressure and shear waves in a solid, induced by waves in a fluid
Hi, I'm using the 'Acoustic-Solid Interaction, Transient' interface from the acoustics module to investigate pressure and shear waves induced in a metal structure, caused by sound waves in water that...
View ArticleMissing linearised Navier-Stocks module in aeroacoustics.
I reinstall the COMSOL 4.4 (with update 1), and can not find the linearised NS module in the aeroacoustics any more. I can also find the user guide of this module in the help file. (See attachment). I...
View ArticleHow to coupling Pressure Acoustic, Frequency Domain(acsl) and Solid Mechanics...
hello, everyone I want to simulate a vibrating membrane to measure the output sound pressure in the air. I want to use Pressure Acoustic, Frequency Domain(acsl) and Solid Mechanics (solid) Physics,...
View Articlehow to model 128 Y cut LiNbO3 ( piezoelectric material ) in a 2-D domain
In my project, I want to model a 128 Y cut LiNbO3 substrate in a 2-D domain. However, in the coordinate system selection, Comsol only allows me to select, like XY, YZ... Plane material system. But I...
View ArticleUse results plot, graphs, derived values from one file in different existing...
I was wondering if anyone knew it was possible to set up a "template" type file where there are multiple 2D, 1D, derived values and plots for one file and then import those plots into another file...
View Articlebaffled duct - PML 3D PROBLEM
Hello every one, I’d like to excite a cylindrical waveguide (rigid in one face and flanged in the other one) with a monopole located in M(x,y,z) and compute the pressure inside the duct. Also, compute...
View ArticleParameter caculation
Hey, I want to calculate the radiation force in a pressure field. The radiation force can be derived ( based on equation )from the pressure. How can I do it in Comsol? Thanks Ying
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