1. 24 Mar, 2017 1 commit
  2. 13 Dec, 2016 1 commit
  3. 04 Dec, 2016 1 commit
  4. 26 Aug, 2015 1 commit
  5. 12 Jun, 2015 1 commit
    • Henry Weller's avatar
      reactingTwoPhaseEulerFoam: New twoPhaseEulerFoam supporting mass-transfer and reactions · eb53f9bd
      Henry Weller authored
      Multi-species, mass-transfer and reaction support and multi-phase
      structure provided by William Bainbridge.
      
      Integration of the latest p-U and face-p_U algorithms with William's
      multi-phase structure is not quite complete due to design
      incompatibilities which needs further development.  However the
      integration of the functionality is complete.
      
      The results of the tutorials are not exactly the same for the
      twoPhaseEulerFoam and reactingTwoPhaseEulerFoam solvers but are very
      similar.  Further analysis in needed to ensure these differences are
      physical or to resolve them; in the meantime the twoPhaseEulerFoam
      solver will be maintained.
      eb53f9bd
  6. 27 Apr, 2015 1 commit
    • Henry's avatar
      twoPhaseEulerFoam: Added experimental face-based momentum equation formulation · fc6b44ee
      Henry authored
      This formulation provides C-grid like pressure-flux staggering on an
      unstructured mesh which is hugely beneficial for Euler-Euler multiphase
      equations as it allows for all forces to be treated in a consistent
      manner on the cell-faces which provides better balance, stability and
      accuracy.  However, to achieve face-force consistency the momentum
      transport terms must be interpolated to the faces reducing accuracy of
      this part of the system but this is offset by the increase in accuracy
      of the force-balance.
      
      Currently it is not clear if this face-based momentum equation
      formulation is preferable for all Euler-Euler simulations so I have
      included it on a switch to allow evaluation and comparison with the
      previous cell-based formulation.  To try the new algorithm simply switch
      it on, e.g.:
      
      PIMPLE
      {
          nOuterCorrectors 3;
          nCorrectors      1;
          nNonOrthogonalCorrectors 0;
          faceMomentum     yes;
      }
      
      It is proving particularly good for bubbly flows, eliminating the
      staggering patterns often seen in the air velocity field with the
      previous algorithm, removing other spurious numerical artifacts in the
      velocity fields and improving stability and allowing larger time-steps
      For particle-gas flows the advantage is noticeable but not nearly as
      pronounced as in the bubbly flow cases.
      
      Please test the new algorithm on your cases and provide feedback.
      
      Henry G. Weller
      CFD Direct
      fc6b44ee