Function for defining the friction forces using the Darcy friction factor.


function Friction
  extends Modelica.Icons.Function;
  import Modelica.Constants.pi;
  input SI.Velocity v "Flow velocity";
  input SI.Diameter D "Pipe diameter";
  input SI.Length L "Pipe length";
  input SI.Density rho "Density";
  input SI.DynamicViscosity mu "Dynamic viscosity of water";
  input SI.Height p_eps "Pipe roughness height";
  output SI.Force F_f "Friction force";
end Friction;

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