Why is it showing Mach number at Pressure Far-Field boundary should not be set to zero?

10 October 2018 0 10K Report

Hello I am running a simulation of rectangular oscillating plate about its center , free stream flow velocity is 12.6 m/s , which makes my mach no to be 0.037 .

I have defined the far surfaces of the stationary enclosure as far-field and I have encountered this issue .

Kindly help !

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