Convection

Some numerical methods, most notaby the algebraic Volume of Fluid method for interface capturing in free surface flows, require the selection of a convective flux.

Upwind

The simplest flux for the colour function is pure upwind. This flux leads to a very diffusive free surface when used with a piecewise constant VOF colour function.

convection:
    c:
        convection_scheme: Upwind

HRIC

High Resolution Interface Capturing. A compressive flux designed to be used in combination with a piecewise constant VOF colour function.

Three versions are implemented

  • Standard HRIC (HRIC, default, the only one that is well tested) 2

  • Modified HRIC (MHRIC, practically untested code, use with caution) 1

  • Refined HRIC (RHRIC, practically untested code, use with caution) 3

convection:
    c:
        convection_scheme: HRIC
        HRIC_version: HRIC          # <-- not needed, HRIC is default

CICSAM

Compressive Interface Capturing Scheme for Arbitrary Meshes. A compressive flux designed to be used in combination with a piecewise constant VOF colour function.

“Numerical prediction of two fluid systems with sharp interfaces”, Imperial College, London, 1997, Onno Ubbink

convection:
    c:
        convection_scheme: CICSAM

Citations

1

ANSYS. Fluent v. 15.0 Theory Manual. ANSYS Inc., 2013.

2

Samir Muzaferija, Milovan Peric, Pierre C. Sames, and Thomas E. Schellin. A two-fluid Navier-Stokes solver to simulate water entry. In Proceedings from the 22nd symposium on naval hydrodynamics, 277–289. 1998.

3

II-Ryong Park, Kwang-Soo Kim, Jin Kim, and Suak-Ho Van. Numerical simulation of free surface flow using a refined HRIC VOF method. Journal of the Society of Naval Architects of Korea, 47(3):279–290, 2010. doi:10.3744/SNAK.2010.47.3.279.