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  ThermoFluidCalc — Offline Fortran Execution Guide
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Calculator : Transient Diffusion in Solids
Category   : Masstransfer

Files Included:
  - transient_diffusion_solid.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 transient_diffusion_solid.f90 -o transient_diffusion_solid

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

  transient_diffusion_solid < 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 (1=Slab, 2=Cylinder, 3=Sphere)): 1
  Line 2 (Half-Thickness/Radius L [m]): 0.01
  Line 3 (Position x/r [m]): 0.0
  Line 4 (Area A [m2]): 0.0
  Line 5 (Diffusivity D [m2/s]): 1e-9
  Line 6 (Convective Mass Transfer Coeff hm [m/s]): 1e-4
  Line 7 (Initial Concentration C0 [mol/m3]): 0.0
  Line 8 (Ambient/Surface Concentration Cs [mol/m3]): 1.0
  Line 9 (Time t [s]): 3600.0
  Line 10 (Solid Density rho_s [kg/m3]): 1000.0

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