.Modelica.Fluid.Dissipation.Utilities.Functions.General.CubicInterpolation_lambda

Information

Syntax

lambda2 = CubicInterpolation_lambda(Re, Re1, Re2, Delta);

Description

Function CubicInterpolation_lambda(..) approximates the modified friction coefficient lambda2=lambda*Re^2 in the transition regime between laminar and turbulent flow of the Moody diagram by a (direct) cubic Hermite spline interpolation. See Modelica.Fluid.UsersGuide.ComponentDefinition.WallFriction (especially Region 2) for a detailed explanation.

Interface

function CubicInterpolation_lambda
  extends Modelica.Icons.Function;
  import Modelica.Math;
  input SI.ReynoldsNumber Re "Reynolds number (= independent variable)";
  input SI.ReynoldsNumber Re1 "Boundary Reynolds number for laminar regime";
  input SI.ReynoldsNumber Re2 "Boundary Reynolds number for turbulent regime";
  input Real Delta "Relative roughness";
  output Real lambda2 "Interpolated modified friction coefficient in transition regime";
end CubicInterpolation_lambda;

Revisions