.TRANSFORM.HeatExchangers.GenericDistributed_HX_Rwall.FlowModel_shell .TRANSFORM.HeatExchangers.GenericDistributed_HX_Rwall.FlowModel_shellShell side flow models (i.e., momentum, pressure loss, wall friction)
model FlowModel_shell = TRANSFORM.Fluid.ClosureRelations.PressureLoss.Models.DistributedPipe_1D.SinglePhase_Developed_2Region_NumStable;