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  1. Nov 13, 2015
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  15. Oct 31, 2015
    • Henry Weller's avatar
      equationOfState/Boussinesq: New equation of state for the Boussinesq... · dfecb23b
      Henry Weller authored 
      equationOfState/Boussinesq: New equation of state for the Boussinesq approximation for buoyant flows

Description
    Incompressible gas equation of state using the Boussinesq approximation for
    the density as a function of temperature only:

    \verbatim
        rho = rho0*(1 - beta*(T - T0))
    \endverbatim

To be used with the buoyantPimpleFoam and buoyantSimpleFoam solvers as
an alternative to using buoyantBoussinesqPimpleFoam or
buoyantBoussinesqSimpleFoam, providing consistency with all other
solvers and utilities using the thermodynamics package in OpenFOAM.
      dfecb23b
  17. Oct 30, 2015
  19. Oct 29, 2015
  21. Oct 25, 2015
  23. Oct 24, 2015
  25. Oct 23, 2015
  27. Oct 22, 2015
  29. Oct 21, 2015
  31. Oct 19, 2015
    • Henry Weller's avatar
      polyMesh: Correct CELL_TETS mode in findCell · 2c46bf15
      Henry Weller authored 
      Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1792
      2c46bf15
    • Henry Weller's avatar
      sixDoFSolver: Run-time selectable solver (integrator) for sixDoFRigidBodyMotion · 95c4f934
      Henry Weller authored 
      The built-in explicit symplectic integrator has been replaced by a
general framework supporting run-time selectable integrators.  Currently
the explicit symplectic, implicit Crank-Nicolson and implicit Newmark
methods are provided, all of which are 2nd-order in time:

Symplectic 2nd-order explicit time-integrator for 6DoF solid-body motion:

    Reference:
        Dullweber, A., Leimkuhler, B., & McLachlan, R. (1997).
        Symplectic splitting methods for rigid body molecular dynamics.
        The Journal of chemical physics, 107(15), 5840-5851.

    Can only be used for explicit integration of the motion of the body,
    i.e. may only be called once per time-step, no outer-correctors may be
    applied.  For implicit integration with outer-correctors choose either
    CrankNicolson or Newmark schemes.

    Example specification in dynamicMeshDict:
    solver
    {
        type    symplectic;
    }

Newmark 2nd-order time-integrator for 6DoF solid-body motion:

    Reference:
        Newmark, N. M. (1959).
        A method of computation for structural dynamics.
        Journal of the Engineering Mechanics Division, 85(3), 67-94.

    Example specification in dynamicMeshDict:
    solver
    {
        type    Newmark;
        gamma   0.5;    // Velocity integration coefficient
        beta    0.25;   // Position integration coefficient
    }

Crank-Nicolson 2nd-order time-integrator for 6DoF solid-body motion:

    The off-centering coefficients for acceleration (velocity integration) and
    velocity (position/orientation integration) may be specified but default
    values of 0.5 for each are used if they are not specified.  With the default
    off-centering this scheme is equivalent to the Newmark scheme with default
    coefficients.

    Example specification in dynamicMeshDict:
    solver
    {
        type    CrankNicolson;
        aoc     0.5;    // Acceleration off-centering coefficient
        voc     0.5;    // Velocity off-centering coefficient
    }

Both the Newmark and Crank-Nicolson are proving more robust and reliable
than the symplectic method for solving complex coupled problems and the
tutorial cases have been updated to utilize this.

In this new framework it would be straight forward to add other methods
should the need arise.

Henry G. Weller
CFD Direct
      95c4f934
  33. Oct 17, 2015
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