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Dear professor,
 I am new to Nektar++, and I want to know something about the CAA in Nektar++. I see the recent paper which use the Antares library solved the FWH equation, but the paper "Variations with Mach number for gust¨Cairfoil interaction noise" is not using FWH euqation, does Nektar++ itself have the ability to calculate noise problem? If so, can the nosie problem only be calculated by compressible solver?
If the noise problem cannot be calculated by a compressible solver alone,  are we going to use an AcousticSolver? And why the Riemann solver in AcousticSolver  maybe_unused?
With best regards