CubicInterpolation_Re

Cubic Hermite spline interpolation of the Reynolds number in transition regime of the Moody diagram (inverse formulation)

Information

This information is part of the Modelica Standard Library maintained by the Modelica Association.

Syntax

Re = CubicInterpolation_Re(0, Re1, Re2, Delta, lambda2);

Description

Function CubicInterpolation_Re(..) approximates the Reynolds number Re in the transition regime between laminar and turbulent flow of the Moody diagram by an inverse formulation of a cubic Hermite spline interpolation. See Modelica.Fluid.UsersGuide.ComponentDefinition.WallFriction (especially Region 2) for a detailed explanation.

Syntax

Re = CubicInterpolation_Re(Re_turbulent, Re1, Re2, Delta, lambda2)

Inputs (5)

Re_turbulent

Type: Real

Description: Unused input

Re1

Type: ReynoldsNumber

Description: Boundary Reynolds number for laminar regime

Re2

Type: ReynoldsNumber

Description: Boundary Reynolds number for turbulent regime

Delta

Type: Real

Description: Relative roughness

lambda2

Type: Real

Description: Modified friction coefficient (= independent variable)

Outputs (1)

Re

Type: ReynoldsNumber

Description: Interpolated Reynolds number in transition region