PLZ NEED HELP !!! Failed to evaluate variables
I followed the instruction of the absorptive muffler from the COMSOL website and tried to add one 1D plot for it. I tried to see the sound pressure level for the muffler once the length is changing in...
View ArticleSolution instability in 2D axis-symmetric model
Hi all, I'm trying to create a 3D model with three concentric spheres of increasing radii, the goal of my simulation being the evaluation of the acoustic pressure field at various points on the largest...
View ArticleFluid-acoustic structure interaction
Hello to everyone, I would like to model the acoustic field at the outlet of a ducts system ( a muffler) with a fluid flow inside by using comsol. More precisely I want to know the sound pressure level...
View ArticleUnobserved explected plane wave symmetry
Hi everyone. I'm working on an very simple acoustics model in which a plane wave excites the space between two parallel walls. (1) First of all I couldn't find a way to impose a plane wave excitation...
View Articleacoustic sound interaction module_pressure backgound
Hello, this is new user of comsol. when I use background pressure field, P_total=P_incident(=P_background)+P_scattered is satisfied(right?) then when I set the background pressure field as plane wave(...
View ArticleSelecting results from different piezos in same setup
Hi all, I have a 2D model with three piezos attached to the same chamber, where I produce a gaussian explosion. I want to study how the different position of the piezos affects the sound pick-up,...
View ArticleMeasuring phonon transmission spectrum
I'm trying to reproduce what is done in the paper (attached) - that is, we have some periodic material and we want to measure it's sound dispersion curves and transmission spectrum. I managed to get...
View ArticleBiological Porous Scaffold with Ultrasound Wave Propagation
Hello everyone, I have a question: How can we model a biological porous scaffold filled with media and simulate an ultrasound wave propagation through it? I am new to COMSOL and I realize I need to use...
View ArticleAcoustic Modes
Dear All, I have attached a model. It's a tube under acoustic pressure surrounded with air domain. Comsol gives the results of frequency domain based on combining different modes. How can I select my...
View Articlerelation between two sudy
hi all, i created a model of piezoelectric device in piezoelectric module,now i want to transfer it to electromagnetic wave module because i need S parameters(that aren't in piezoelectric answers)but...
View ArticleSuction cup release sound
Do we know what makes the sound of a suction cup releasing from a piece of glass, for example? This popping or snapping sound also occurs under water. Is it the sudden rush of air in or is it the...
View ArticleRemoving energy from a system in the Acoustics module
I'm trying to simulate standing waves inside of a cavity network, so there are no inlets or outlets, just gas at a constant pressure and temperature as the initial conditions. I then apply power...
View ArticleNeed help regarding acoustic model
Hello Guys, I am glad that I finally joined COMSOL community. A bit of information about myself: I am a student at Technion, a university in Israel, working our wind tunnel. Recently, we had some...
View ArticleAcoustics of a Plate in a Spherical Space
I want to simulate the acoustics of a rectangular plate vibrating at a given frequency in a spherical air space. I need sound pressure level in the air domain. I want the PML (perfectly matched layer)...
View ArticleTransmission loss in simple model
Hi, I'd like to analyze the frequency dependency of the transmission loss (TL) of a simple structural/acoustic model, which is depicted here: www.alfwarnock.info/sound/images/tlsuite.gif Some problems...
View ArticleHelp needed with model to find acoustic transmission loss of a membrane.
I've been trying to 2 weeks now to get this model working with no joy so far. It's a membrane with a mass attached to the centre. I have YM, PR & density for membrane & mass. I need to...
View ArticleSound hard and radiation boundaries in acoustic medium!
Hi all, I am using FEMLAB script to solve acoustic problem. I'm facing some difficulty in setting boundary conditions for my model. Here is my code: % DEFINE GEOMETRY, MESH, AND SUBDOMAIN/BOUNDARY...
View Articlefinite volume, volume of fluid, boundary integral method
Hello, I'm trying to model a cavitation air-bubble in water under ultrasound waves. For that I need to use a Boundary integral method to solve the Laplace equation. The finite element method I try to...
View ArticleFlow and pressure Acoustics models
Hai is there any example model of flow and pressure Acoustics, to understand how pressure various when there is a constant flow, or heavy flow of liquids. thank you, taraka
View ArticleModeling Traffic Noise with Comsol
Hello, I am interested in using Comsol's Acoustics module to simulate the sound propagation from different roadway geometries (elevated, depressed, with(out) wall barriers). The setup I wish to use...
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