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

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

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1. How to Compile
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Make sure you have a Fortran compiler installed (like gfortran).
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 redirect the input.txt file into stdin:

  reynolds_number < input.txt

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3. Input File Details
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The input file 'input.txt' contains sequential parameters separated by
newlines. Here is the structure of the included 'input.txt':

  Line 1 (Geometry Type (1=Pipe, 2=Plate, 3=Annulus, 4=Duct)): 1
  Line 2 (Diameter D or Length L [mm]): 50.0
  Line 3 (Outer Diameter [mm] (Annulus only)): 0.0
  Line 4 (Width [mm] (Duct only)): 0.0
  Line 5 (Height [mm] (Duct only)): 0.0
  Line 6 (Velocity V [m/s]): 2.0
  Line 7 (Fluid Type (1=Air, 2=Water, 3=Oil, 4=Custom)): 2
  Line 8 (Custom Density [kg/m3] (Custom fluid only)): 0.0
  Line 9 (Custom Viscosity [Pa-s] (Custom fluid only)): 0.0

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ThermoFluidCalc — https://thermofluidcalc.com
