Enhancing active wave absorption in RANS models

TL;DR

This paper extends active wave absorption methods in RANS models to work effectively across all water depths by re-deriving the formulation, demonstrating superior performance over traditional methods in various wave conditions.

Contribution

The authors introduce the Extended Range Active Wave Absorption (ER-AWA), which overcomes previous limitations and enhances wave absorption in RANS models across shallow to deep waters.

Findings

ER-AWA outperforms traditional methods in all tested scenarios.

Combining ER-AWA with relaxation zones further reduces wave reflections.

Performance depends on parameter tuning for relaxation zones.

Abstract

In this work we review the most common methods for absorbing waves in Reynolds-Averaged Navier-Stokes (RANS) models. The limitations of active wave absorption, originating from its initial assumption of linear wave theory in shallow waters are overcome and the range of applicability is extended to any relative water depth conditions by re-deriving the formulation. The new Extended Range Active Wave Absorption (ER-AWA) overperforms the traditional implementation in all the tests performed, which comprise solitary waves and regular waves from shallow to deep waters. Moreover, the combined use of a relaxation zone and ER-AWA is tested to further reduce wave reflections. This is most often achieved for a given set of parameters, although some case by case tuning of the relaxation zone parameters would be needed to obtain the best overall performance.