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Wave and Current Interactions
Oral
David Fuhrman
Technical University of Denmark
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.