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Old   November 28, 2001, 03:31
Default Directivity
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Dear all,

in computational aeroacoustics it is often talked about DIRECTIVITY. Can anybody tell me what does it mean and how to compute it?

Thanks in advance Matthias
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Old   December 4, 2001, 14:27
Default Re: Directivity
Fred Souliez
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Well, for a given distance from your noise source (you somehow have to be far enough to consider that your observer is at the same distance of all the sources in question (if you use a Kirchhoff or FW-H method for example), you describe a certain distribution of observer angles say with respect to the downstream axis. Practical case, I investigate the aerodynamic noise of a landing gear: for each directivity plot, I use 72 observers (one every 5 degrees), at 10 radii, 20 radii, 30 radii, etc... from the center of the landing gear. I give you a link to some plots I made which illustrate the observer grid and the resulting directivity plot. Viel Glueck (Bonne chance?)

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