.TRANSFORM.Fluid.ClosureRelations.HeatTransfer.Models.DistributedPipe_1D_MultiTransferSurface.Nus_SinglePhase_2Region_modelBased.Nus_region2 .TRANSFORM.Fluid.ClosureRelations.HeatTransfer.Models.DistributedPipe_1D_MultiTransferSurface.Nus_SinglePhase_2Region_modelBased.Nus_region2model Nus_region2 = TRANSFORM.Fluid.ClosureRelations.HeatTransfer.Models.DistributedPipe_1D_MultiTransferSurface.BaseClasses.SinglePhase.Nu_DittusBoelter;