1. 18 Dec, 2019 2 commits
    • Andrew Heather's avatar
    • Kutalmış Berçin's avatar
      ENH: new RAS model: kEpsilonPhitF · e38e5d67
      Kutalmış Berçin authored
          ENH: modify fWallFunction for kEpsilonPhitF model
          The k-epsilon-phit-f turbulence closure model for incompressible and
          compressible flows.
          The model is a three-transport-equation linear-eddy-viscosity turbulence
          closure model alongside an elliptic relaxation equation:
            - Turbulent kinetic energy, \c k,
            - Turbulent kinetic energy dissipation rate, \c epsilon,
            - Normalised wall-normal fluctuating velocity scale, \c phit,
            - Elliptic relaxation factor, \c f.
              Standard model (Tag:LUU):
                  Laurence, D. R., Uribe, J. C., & Utyuzhnikov, S. V. (2005).
                  A robust formulation of the v2−f model.
                  Flow, Turbulence and Combustion, 73(3-4), 169–185.
          The default model coefficients are (LUU:Eqs. 19-20):
                  Cmu         0.22,    // Turbulent viscosity constant
                  Ceps1a      1.4,     // Model constant for epsilon
                  Ceps1b      1.0,     // Model constant for epsilon
                  Ceps1c      0.05,    // Model constant for epsilon
                  Ceps2       1.9,     // Model constant for epsilon
                  Cf1         1.4,     // Model constant for f
                  Cf2         0.3,     // Model constant for f
                  CL          0.25,    // Model constant for L
                  Ceta        110.0,   // Model constant for L
                  CT          6.0,     // Model constant for T
                  sigmaK      1.0,     // Turbulent Prandtl number for k
                  sigmaEps    1.3,     // Turbulent Prandtl number for epsilon
                  sigmaPhit   1.0,     // Turbulent Prandtl number for phit = sigmaK
          The name of the original variable replacing 'v2' is 'phi' (LUU:Eq. 14).
          However, the name 'phi' preexisted in OpenFOAM; therefore, this name was
          replaced by 'phit'