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nutkRoughWallFunction: Re-derived and implemented to improve stabilit…
…y and range of applicability This wall function is now stable even if the near-wall cell centre distance is less than the roughness height although it is unlikely to be very accurate if used in this way. The sudden change limit stabilisation has been re-implemented to avoid the near-wall viscosity being lower limited to half the laminar viscosity which has no physical meaning.
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