Wave and Current Interactions
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.