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New boundary condition definition

Implement following boundary condition given by the following mathematical expression:

$\displaystyle x = \frac{x_0}{1 + e^{-10\frac{t}{t_0}+5}}$(13.1)


  • $ x_0$ and $ t_0$ are prescribed parameters
  • Roughly speaking, $ x$ rises from $ 0$ at time $ 0$ to $ x_0$ at time $ t_0$
  • OpenFOAM provides two main approaches:
    • codedFixedValue – very powerful and easily applicable
    • uniformFixedValue – requires implementation of new function