Hi @sjoshi, as @BenLewis stayed, there’s a problem with forces. Total X force (Drag) should become steady after a few seconds. Fixed Z position of the hull shouldn’t be a problem for your velocity and Rn. If something as a Karman Vortex is raising behind the hull, it is not visible in your graphics.
By the way, @Maciek, I personally prefer complete screen captures because in that way part of the interface and settings are visible. I have a lot to learn before using the interface properly
At this stage it is premature to compare with existing and real data, but reaching that point there are many well known studies out there. Perhaps one of the most famous is the Delft Series (DSYHS), Delft University recently published all the data, including hull shapes used on tank testing for over 30 years of studies.
This document may be of interest: An extensive cfd analysis (using ANSYS CFX) of one of the Delft hulls.
And here a related video: