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The 'featureAngle' control defines the included angle between faces above which layer extrusion is prevented. Its use within snappyHexMesh was incorrect in that the cosine was not being taken before being compared to dot products of face normals. This has now been corrected. Existing 'featureAngle' settings may need changing to recover equivalent behaviour. Any angle previously set to 58 degrees or above previously resulted in no reduction of layer coverage. A large angle between 90 and 180 degrees is likely to be an appropriate replacement for cases such as this. Angles previously set to 57 degrees and below can be equivalently replaced by a value of (180/pi)*arccos(<angle>*(pi/180)). Note that changing the feature angle also affects the slip feature angle. The slip feature angle is taken to be half the feature angle if a 'slipFeatureAngle' is not specified.
Reference: Duisburg Test Case (DTC) el Moctar, O., Shigunov, V., Zorn, T., Duisburg Test Case: Post-Panamax Container Ship for Benchmarking, Journal of Ship Technology Research, Vol.59, No.3, pp. 50-65, 2012