.BuildingSystems.Fluid.BaseClasses.FlowModels.basicFlowFunction_m_flow_der2

Information

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

Interface

function basicFlowFunction_m_flow_der2
  extends Modelica.Icons.Function;
  input Modelica.Units.SI.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.Units.SI.MassFlowRate m_flow_turbulent(min = 0) "Mass flow rate where transition to turbulent flow occurs";
  input Real m_flow_der(unit = "kg/s2") "1st derivative of mass flow rate in design flow direction";
  input Real m_flow_der2(unit = "kg/s3") "2nd derivative of mass flow rate in design flow direction";
  output Real dp_der2 "2nd derivative of pressure difference between port_a and port_b (= port_a.p - port_b.p)";
end basicFlowFunction_m_flow_der2;

Revisions

• January 4, 2019, by Michael Wetter:
  Set `Inline=false`.
  See #1070.
• May 1, 2017, by Filip Jorissen:
  Revised implementation such that BuildingSystems.Fluid.BaseClasses.FlowModels.basicFlowFunction_dp is C2 continuous. See #725.
• January 22, 2016, by Michael Wetter:
  Corrected type declaration of pressure difference. This is for #404.
• July 29, 2015, by Michael Wetter:
  First implementation.