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  ThermoFluidCalc — Standalone Fortran Execution Guide
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Calculator : Reynolds Number & Entry Length
Category   : Fluid

Files Included:
  - reynolds_number.f90 (Fortran 90/2008 Source Code)
  - input.txt (Pre-configured Sample Input)

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1. How to Compile
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Make sure you have GNU Fortran (gfortran) or Intel Fortran (ifort) installed.
Run the following compilation command in your terminal:

  gfortran -O3 reynolds_number.f90 -o reynolds_number

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2. How to Execute
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Run the compiled binary and pipe the input.txt file into stdin:

  reynolds_number < input.txt

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3. Input Parameter Sequence
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Geometry Type (1=Pipe, 2=Plate, 3=Annulus, 4=Duct)
Diameter D or Length L [mm]
Outer Diameter [mm] (Annulus only)
Width [mm] (Duct only)
Height [mm] (Duct only)
Velocity V [m/s]
Fluid Type (1=Air, 2=Water, 3=Oil, 4=Custom)
Custom Density [kg/m3] (Custom fluid only)
Custom Viscosity [Pa-s] (Custom fluid only)

Website : https://thermofluidcalc.com
