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The FWH Solver is a VNoise module that permit to consider aero-acoustic sources
in VNoise analyses. Typical applications include:
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Sound radiated by blades, fans, rotors.
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Sound generated by unsteady pressure fluctuations on solid surfaces
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Sound radiated by turbulence.
The
FWH Solver is based on an advanced integration technique of the
Ffowcs Williams Hawkings equation. Typically the FWH solver require
some aerodynamic data computed by a CFD code, and that characterize
the aero-acoustic source.
The FWH Solver then permit to
integrate the FWH equation over a suitable surface that enclose the
source. Both permeable and non permeable surfaces are available
enabling a more easy choice of the integration surface, and a more
easy coupling with CFD codes.
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Typical example of the integration surface are:
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Surface of rotating blades and fans.
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Physical surfaces on which aerodynamic loads are applied.
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Fictitious surfaces that enclose an aeroacoustic source.
Both fixed and rotating integration surfaces can be used. The results provided
by the FWH Solver are the acoustic pressures generated by the aerodynamic sound
in any desired microphone position. If in the proximity of the aerodynamic
noise sources, other objects are present that can scatter the aerodynamic
noise, or if some elastic structure is present that can couple with the
generated sound field, then the sound field computed by the FWH Solver can be
used as a starting point for a VNoise BEM analysis that can eventually take
into account the scattering effects of other bodies or can include the coupling
with structural deformations.
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