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  ThermoFluidCalc — Offline Fortran Execution Guide
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Calculator : Lumped System Analysis (Transient)
Category   : Conduction

Files Included:
  - lumped_system_analysis.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 lumped_system_analysis.f90 -o lumped_system

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

  lumped_system < 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=Plate)): 1
  Line 2 (Characteristic Dimension (Radius or Half-Thickness) [m]): 0.03
  Line 3 (Material Density ($\rho$) [kg/m³]): 8500.0
  Line 4 (Specific Heat ($c_p$) [J/kg-K]): 380.0
  Line 5 (Conductivity ($k$) [W/m-K]): 110.0
  Line 6 (Convection Coefficient ($h$) [W/m²-K]): 250.0
  Line 7 (Initial Temperature ($T_i$) [°C]): 150.0
  Line 8 (Ambient Temperature ($T_\infty$) [°C]): 20.0
  Line 9 (Time ($t$) [s]): 180.0

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