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- W1978753148 abstract "The relative contribution of broadband noise has steadily increased over the last decadesas the mechanisms creating tones are now well understood and can be efficiently reduced.For fan-design capabilities an interim or intermediate solution is needed between restrictiveanalytical models and full-resolved costly simulations.Ewert et al.1 proposed an affordable way to simulate broadband noise with a CAA solverin the time domain while accounting for the complex geometry and background flow. TheRandom-Particle-Mesh (RPM) method reconstructs the turbulent fluctuations based on aRANS calculation. Turbulence source is coupled to the Acoustic Perturbation Equationssolved by a CAA solver. The approach was applied sucessfully for slat noise and generictrailing-edge noise problems.Our investigations showed that this coupling method does not work sufficiently for lead-ing edge noise of generic airfoil configurations if the vortex sound sources are determinedfrom an incident vorticity field that does not include the additional effect of scatteredvorticity shed from the trailing edge of the airfoil due to the presence of a Kutta condition.The objective of this article is to extend and validate the coupling between the RPMand the CAA domain to explicitly include the enforcement of the Kutta condition intothe CAA model for homogeneous and potential flow. This is achieved by adding anotherdomain which computes the vorticity–wall interaction.Theoretically the approach should be sufficient to separate the surface from the volu-metric sources. This works very well for a flat plate. But we apply this on a NACA0012airfoil in potential flow which gives unreasonable results. We discuss the issue and offerideas for this cause." @default.
- W1978753148 created "2016-06-24" @default.
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- W1978753148 date "2013-05-24" @default.
- W1978753148 modified "2023-10-14" @default.
- W1978753148 title "Simultaneous Computation of Surface and Volume Sources for Fan Broadband Noise with the Random-Particle-Mesh Method" @default.
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- W1978753148 doi "https://doi.org/10.2514/6.2013-2119" @default.
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