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Allows the specification of a reference height, for example the height of the free-surface in a VoF simulation, which reduces the range of p_rgh. hRef is a uniformDimensionedScalarField specified via the constant/hRef file, equivalent to the way in which g is specified, so that it can be looked-up from the database. For example see the constant/hRef file in the DTCHull LTSInterFoam and interDyMFoam cases.
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