Define dimension factor φ for different types of fittings.


function FittingPhi
  extends Modelica.Icons.Function;
  input SI.Velocity v "Flow velocity";
  input SI.Diameter D_i "Pipe diameter of inlet (LHS)";
  input SI.Diameter D_o "Pipe diameter of outlet (RHS)";
  input SI.Length L "Fitting length";
  input Modelica.Units.NonSI.Angle_deg theta = 90 "Angle of the tapered reduction/expansion";
  input SI.Density rho "Density";
  input SI.DynamicViscosity mu "Dynamic viscosity of water";
  input SI.Height p_eps "Pipe roughness height";
  input Types.Fitting fit_type "Type of pipe fitting";
  output Real phi;
end FittingPhi;

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