Dear Rob,
I have provided the 6cm wave height (third order Stoke's theory) at the inlet, but the wave is not starting from the inlet.
Meshing details:-
I have given face sizing for the structure and didn't use inflation.
Nodes:- 437302
Elements:- 2330736
Element Quality: 0.19651 Min- 0.99992 Max
Aspect ratio of mesh: 9.9957 Max -- 1.1656 Min
Thank you.