I am using OpenFAST-V3.5.1. This version can output wave surface.
But I did not find options in Hydrodyn to set wave surface side length or the discretization. Thus, I am concerned if there are any variables to get the wave surface with my desired area.
Upcoming in OpenFAST v4.0 with the release of the new SeaState module (see the following pull request for more information: Additional features for the new SeaState module and HydroDyn by luwang00 · Pull Request #1008 · OpenFAST/openfast · GitHub), the user will specify a grid where the wave elevation can be visualized.
Until then, the wave-elevation visualization is computed on a square grid that scales with the rotor diameter (the length of each side is equal to twice the rotor diameter).
Thanks for the clarification.