function m_flow_of_dp_fric extends Modelica.Icons.Function; input dp_IN_con IN_con "Input record for function dp_overall_MFLOW" annotation( Dialog(group = "Constant inputs")); input dp_IN_var IN_var "Input record for function dp_overall_MFLOW" annotation( Dialog(group = "Variable inputs")); input SI.Pressure dp_fric "Pressure loss due to friction (dp = port_a.p - port_b.p)"; output SI.MassFlowRate m_flow; output Real dm_flow_ddp_fric "Derivative of mass flow rate with dp_fric"; end m_flow_of_dp_fric;