1. 05 Aug, 2016 5 commits
  2. 04 Aug, 2016 7 commits
    • Henry Weller's avatar
      epsilonWallFunction, omegaWallFunction: Set generation to zero in laminar sub-layer · 55065d63
      Henry Weller authored
      Improves stability for complex flows
      55065d63
    • Henry Weller's avatar
      dd659dcc
    • Henry Weller's avatar
      BrunDrippingInjection: Calculate drop diameter from the capillary length · c022e5ad
      Henry Weller authored
      The diameter of the drops formed are obtained from the local capillary
      length multiplied by the \c dCoeff coefficient which defaults to 3.3.
      
      Reference:
          Lefebvre, A. (1988).
          Atomization and sprays
          (Vol. 1040, No. 2756). CRC press.
      c022e5ad
    • Henry Weller's avatar
      omegaWallFunction: Improved low-Reynolds number behavior and consistency with... · 6131d5c1
      Henry Weller authored
      omegaWallFunction: Improved low-Reynolds number behavior and consistency with the epsilonWallFunction
      
      Changed default mode of operation to use standard y+ based switching
      rather than the previous ad hoc blending and added consistent handling
      of the near-wall generation term.
      
      This boundary condition provides a wall constraint on turbulnce specific
      dissipation, omega for both low and high Reynolds number turbulence models.
      
      The near-wall omega may be either blended between the viscous region and
      logarithmic region values using:
      
          \f[
              \omega = sqrt(\omega_{vis}^2 + \omega_{log}^2)
          \f]
      
      where
      
      \vartable
          \omega_{vis} | omega in viscous region
          \omega_{log} | omega in logarithmic region
      \endvartable
      
      see eq.(15) of:
      \verbatim
          Menter, F., Esch, T.
          "Elements of Industrial Heat Transfer Prediction"
          16th Brazilian Congress of Mechanical Engineering (COBEM),
          Nov. 2001
      \endverbatim
      
      or switched between these values based on the laminar-to-turbulent y+ value
      derived from kappa and E.  Recent tests have shown that the standard
      switching method provides more accurate results for 10 < y+ < 30 when used
      with high Reynolds number wall-functions and both methods provide accurate
      results when used with continuous wall-functions.  Based on this the
      standard switching method is used by default.
      6131d5c1
    • Henry Weller's avatar
      epsilonWallFunction: Updated to work with both low- and high-Reynolds number turbulence models · 712f6277
      Henry Weller authored
      This boundary condition provides a turbulence dissipation wall constraint
      for low- and high-Reynolds number turbulence models.
      
      The condition can be applied to wall boundaries for which it
      - calculates \c epsilon and \c G
      - specifies the near-wall epsilon value
      
      where
      
      \vartable
          epsilon | turblence dissipation field
          G       | turblence generation field
      \endvartable
      
      The model switches between laminar and turbulent functions based on the
      laminar-to-turbulent y+ value derived from kappa and E.
      
      Recent tests have shown that this formulation is more accurate than
      the standard high-Reynolds number form for 10 < y+ < 30 with both
      standard and continuous wall-functions.
      
      Replaces epsilonLowReWallFunction and should be used for all
      low-Reynolds number models for which the epsilonLowReWallFunction BC was
      recommended.
      712f6277
    • Henry Weller's avatar
    • Henry Weller's avatar
      4652677f
  3. 03 Aug, 2016 1 commit
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  5. 01 Aug, 2016 6 commits
  6. 31 Jul, 2016 1 commit
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  9. 26 Jul, 2016 1 commit
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  11. 22 Jul, 2016 2 commits