Author(s): William Pringle; Nozomu Yoneyama
Linked Author(s):
Keywords: Two-way coupling; Tsunami; Depth-averaged wave equations; RANS; VOF
Abstract: To correctly replicate flow velocities through towns and the forces on structures due to tsunami or storm surge attacks, more sophisticated models may be required than traditional depth-averaged models if greater detail is desired. We describe a two-way coupling procedure for combining a depth-averaged shallow water model with a RANS model. To show that the model is stable and able to replicate wave breaking phenomena we investigate solitary wave runup on a plane beach in detail. We find that in terms of stability and accuracy the boundary to the RANS model may be inserted anywhere on the slope below the position of the initial shoreline. Furthermore, by optimizing the RANS boundary position the combined model could replicate the wave shoaling and breaking process for a solitary wave where H/h=0.05 on a 1:19.85 slope, almost identically to the full RANS calculation but in only 7.9%of the calculation time.
Year: 2014