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boundaryFoam

Overview​

  • Category: Incompressible
  • steady state
  • incompressible
  • turbulence
  • evolves the flow system to reach a target average velocity
  • useful to set velocity and turbulence inflow conditions based on a fully developed flow profile

Equations​

The velocity is modelled according to the equation

∇ ∙ Rdev=∇p+SU \div \tensor{R}_{dev} = \grad p + S_U

where the velocity and pressure gradient are corrected to achieve the target velocity u‾\overline{\u}. After solving the above equation, the velocity is corrected from the current volume-averaged velocity, i.e.

un+1=un+(u‾−u‾n) \u^{n+1} = \u^n + \left( \overline{\u} - \overline{\u}^n \right)

and the pressure gradient from:

(∇p)n+1=(∇p)n+1A(u‾−u‾n)‾ \left(\grad p\right)^{n+1} = \left(\grad p\right)^{n} + \overline{\frac{1}{\mat{A}}\left( \overline{\u} - \overline{\u}^n \right)}

where the averages are calculated as volume averages.

Input requirements​

Mandatory fields:

Physical models​

Solution controls​

Further information​

Source code

See also

Tutorials