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  ThermoFluidCalc — Offline Fortran Execution Guide
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Calculator : External Flow Drag Force Solver
Category   : Fluid

Files Included:
  - drag_force_calculator.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 -ffree-line-length-none drag_force_calculator.f90 -o drag_calc

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

  drag_calc < 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 Code (1=Sphere, 2=Cylinder, 3=Flat Plate)): 1
  Line 2 (Characteristic Dimension (Diameter or Length) [m]): 0.05
  Line 3 (Free-stream Velocity ($V$) [m/s]): 10.0
  Line 4 (Fluid Density ($\rho$) [kg/m³]): 1.2
  Line 5 (Fluid Viscosity ($\mu$) [Pa-s]): 1.8e-5

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ThermoFluidCalc — https://thermofluidcalc.com
