A correction technique for spurious signals from the permeable ffowcs williams-hawkings equation
(2018) AIAA/CEAS Aeroacoustics Conference, 2018 (15.June.2018)
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- Abstract
- In this paper, an equivalent source based correction technique for the spurious signals observed when utilizing the permeable Ffowcs Williams-Hawkings equation is proposed. The methodology aims to ensure that the fundamental assumption of a null field inside the permeable data surface is maintained at all times. Since it is based on this fundamental assumption, it should be generally applicable for all cases with an arbitrary motion and shape of the permeable data surface, in a stationary or moving medium. The methodology is non-intrusive, and thus could be coupled with any existing permeable surface acoustic solver. The concept of the method is to define control points inside the permeable data surface, and observe the spurious signals present at these points. Equivalent sources are then defined to nullify the acoustic pressure at the control points, and correspondingly correct the predicted far-field acoustic pressure. The effectiveness of the method has been demonstrated in both a two-dimensional stationary medium test case, and a moving medium test case, correcting the predicted far-field acoustic pressure to the analytical solution with minimal error. However, further investigation is required in regards to the exact definition of the equivalent sources and control points, specifically in moving medium cases. © 2018 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.
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Ricks, N., Siozos-Rousoulis, L., Huang, Z., Contino, F., & Ghorbaniasl, G. (2018). A correction technique for spurious signals from the permeable ffowcs williams-hawkings equation. AIAA/CEAS Aeroacoustics Conference, 2018. https://hdl.handle.net/2078.5/169836