You said you were able to run with 50 m/s from scratch. From the UDF or Transient Table the maximum velocity is 15 m/s. Please verify your statements here.
Transient run depends on the initialization but might lead to steady-state result with might correspond to a case which is run without ramping. I do just highlight "might" as flow hysteresis and numerical inconsistencies.
Please scrutinize the area where the pressure profile is not behaving as it should by showing the plot every time-step and check the contour of pressure on walls of the airfoil directly.
I hope that community members might help you here further.
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