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Mach number less than 0.1 (Ma < 0.1)
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Mach number greater than 0.1 (Ma > 0.1):
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Note that when the background mean flow velocity u0 is set to zero, the linearized Navier-Stokes equations reduce to the thermoviscous acoustic equations. However, in thermoviscous acoustics the default discretization is P1, P2, P2 and no stabilization is applied.
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