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    • Will Bainbridge's avatar
      Lagrangian: Rewrite of the particle tracking algorithm to function in · 743dea87
      Will Bainbridge authored
      terms of the local barycentric coordinates of the current tetrahedron,
      rather than the global coordinate system.
      
      Barycentric tracking works on any mesh, irrespective of mesh quality.
      Particles do not get "lost", and tracking does not require ad-hoc
      "corrections" or "rescues" to function robustly, because the calculation
      of particle-face intersections is unambiguous and reproducible, even at
      small angles of incidence.
      
      Each particle position is defined by topology (i.e. the decomposed tet
      cell it is in) and geometry (i.e. where it is in the cell). No search
      operations are needed on restart or reconstruct, unlike when particle
      positions are stored in the global coordinate system.
      
      The particle positions file now contains particles' local coordinates
      and topology, rather than the global coordinates and cell. This change
      to the output format is not backwards compatible. Existing cases with
      Lagrangian data will not restart, but they will still run from time
      zero without any modification. This change was necessary in order to
      guarantee that the loaded particle is valid, and therefore
      fundamentally prevent "loss" and "search-failure" type bugs (e.g.,
      2517, 2442, 2286, 1836, 1461, 1341, 1097).
      
      The tracking functions have also been converted to function in terms
      of displacement, rather than end position. This helps remove floating
      point error issues, particularly towards the end of a tracking step.
      
      Wall bounded streamlines have been removed. The implementation proved
      incompatible with the new tracking algorithm. ParaView has a surface
      LIC plugin which provides equivalent, or better, functionality.
      
      Additionally, bug report <https://bugs.openfoam.org/view.php?id=2517>
      is resolved by this change.
      743dea87
  15. 20 Apr, 2017 1 commit
    • Henry Weller's avatar
      The "<type>Coeffs" sub-dictionary is now optional for most model parameters · 5c518365
      Henry Weller authored
      except turbulence and lagrangian which will also be updated shortly.
      
      For example in the nonNewtonianIcoFoam offsetCylinder tutorial the viscosity
      model coefficients may be specified in the corresponding "<type>Coeffs"
      sub-dictionary:
      
      transportModel  CrossPowerLaw;
      
      CrossPowerLawCoeffs
      {
          nu0         [0 2 -1 0 0 0 0]  0.01;
          nuInf       [0 2 -1 0 0 0 0]  10;
          m           [0 0 1 0 0 0 0]   0.4;
          n           [0 0 0 0 0 0 0]   3;
      }
      
      BirdCarreauCoeffs
      {
          nu0         [0 2 -1 0 0 0 0]  1e-06;
          nuInf       [0 2 -1 0 0 0 0]  1e-06;
          k           [0 0 1 0 0 0 0]   0;
          n           [0 0 0 0 0 0 0]   1;
      }
      
      which allows a quick change between models, or using the simpler
      
      transportModel  CrossPowerLaw;
      
      nu0         [0 2 -1 0 0 0 0]  0.01;
      nuInf       [0 2 -1 0 0 0 0]  10;
      m           [0 0 1 0 0 0 0]   0.4;
      n           [0 0 0 0 0 0 0]   3;
      
      if quick switching between models is not required.
      
      To support this more convenient parameter specification the inconsistent
      specification of seedSampleSet in the streamLine and wallBoundedStreamLine
      functionObjects had to be corrected from
      
          // Seeding method.
          seedSampleSet   uniform;  //cloud; //triSurfaceMeshPointSet;
      
          uniformCoeffs
          {
              type        uniform;
              axis        x;  //distance;
      
              // Note: tracks slightly offset so as not to be on a face
              start       (-1.001 -0.05 0.0011);
              end         (-1.001 -0.05 1.0011);
              nPoints     20;
          }
      
      to the simpler
      
          // Seeding method.
          seedSampleSet
          {
              type        uniform;
              axis        x;  //distance;
      
              // Note: tracks slightly offset so as not to be on a face
              start       (-1.001 -0.05 0.0011);
              end         (-1.001 -0.05 1.0011);
              nPoints     20;
          }
      
      which also support the "<type>Coeffs" form
      
          // Seeding method.
          seedSampleSet
          {
              type        uniform;
      
              uniformCoeffs
              {
                  axis        x;  //distance;
      
                  // Note: tracks slightly offset so as not to be on a face
                  start       (-1.001 -0.05 0.0011);
                  end         (-1.001 -0.05 1.0011);
                  nPoints     20;
              }
          }
      5c518365
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