.TRANSFORM.HeatExchangers.GenericDistributed_HX_withMass.InternalTraceGen_shell .TRANSFORM.HeatExchangers.GenericDistributed_HX_withMass.InternalTraceGen_shellmodel InternalTraceGen_shell = Fluid.ClosureRelations.InternalTraceGeneration.Models.DistributedVolume_Trace_1D.GenericTraceGeneration;