.Annex60.Fluid.BaseClasses.FlowModels.basicFlowFunction_m_flow_der

Information

Function that implements the first order derivative of Annex60.Fluid.BaseClasses.FlowModels.basicFlowFunction_m_flow with respect to the mass flow rate.

Interface

function basicFlowFunction_m_flow_der
  extends Modelica.Icons.Function;
  input Modelica.SIunits.MassFlowRate m_flow "Mass flow rate in design flow direction";
  input Real k(unit = "") "Flow coefficient, k=m_flow/sqrt(dp), with unit=(kg.m)^(1/2)";
  input Modelica.SIunits.MassFlowRate m_flow_turbulent(min = 0) "Mass flow rate where transition to turbulent flow occurs";
  input Real m_flow_der(unit = "kg/s2") "Derivative of mass flow rate in design flow direction";
  output Real dp_der "Derivative of pressure difference between port_a and port_b (= port_a.p - port_b.p)";
end basicFlowFunction_m_flow_der;

Revisions

• July 29, 2015, by Michael Wetter:
  First implementation to avoid in Dymola 2016 the warning "Differentiating ... under the assumption that it is continuous at switching".