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Problems with fluid-acoustic coupling for CAA simulationsI am currently implementing a 3D block-structured FD-solver for flow-induced
acoustics based on a hybrid approach using linearized equations, like linearized Euler Equations, Linearized Perturbed Compressible Equations etc. For numerical methods, the well-known techniques like DRP-scheme for spatial discretization, low-dissipation and low-dispersion Runge-Kutta schemes of fourth order, appropriate filtering techniques as well as reflecting and non-reflecting boundary conditions are utilized. For purely acoustic phenomena, that would be mostly academic test cases, the developed solver works very well and shows good till excellent agreement to analytical and reference results. Right now I have come to that point where I want to compute an actual flow-induced acoustical simulation, but the problem is that I am struggling with the fluid-acoustics coupling at the moment. I have tried to nondimensionalize the governing equations with two different nondimensioning approaches, resulting in acoustic equations dependent of the Mach-number. Nevertheless, the approach seems not to work. My question is now, whether anyone has ever implemented a CAA-code? Furthermore, can anyone give me a hint how to couple fluid results with the acoustic simulation in an appropriate and correct way? |

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