Wave and Current Interactions

Oral

1467 - A Solution To The Over-Production Of Turbulence Beneath Surface Waves In Rans-Models

Presenting Author(s)

• DF

  David Fuhrman

  Technical University of Denmark

Additional Author #1(s)

• 

  Bjarke Eltard Larsen, PhD

  Postdoc
  Technical University of Denmark

Over the past two decades, CFD simulations of breaking waves with RANS closure models have shown a marked tendency to over-predict turbulence, both outside and within the surf-zone. This is most likely due to the conditional instability of such closures in the nearly potential-flow region, as originally shown by Mayer & Madsen (ICCE, 2000). In this work we prove that: (1) standard two-equation closures (k-omega and k-epsilon) are unconditionally unstable and (2) they can be simply and elegantly stabilized, thus solving this long-standing and wide-spread problem. CFD applications with stabilized closures will be shown for both non-breaking and breaking waves.