Hello Caleb,
Which solver are you using? Have you tried with the latest R14 MPP double precision solver? You can download it here:
https://ftp.lstc.com/user/download_page.html
username: user
password: computer
Have you tried decreasing the timestep?
Here are 2 examples with wave generation:
https://www.dynaexamples.com/icfd/basics-examples/wave_gen
https://www.dynaexamples.com/icfd/advanced-examples/pillar
Let me know how it goes.
Reno.