Sea level has a very small negative slope for large simulations (>100 s)
I am evaluating irregular waves in a 2D domain and measuring the waves approximately 4 m (1 wavelength) from piston. When I plot the surface elevation for 150 s, I notice a very small negative slope (3.08x10^-5) as if the surface elevation is decreasing.
I tried the following to see if this is reduced
- Increase Ramp time from 20 to 40 s
- Increase domain size with a large damping zone (to prevent reflection)
- Increase coefh from 1 to 1.2 and 1.5
For all three methods, the issue persists. I am currently running simulations with DensityDT delta term reduced from 0.15 to 0.1 and another case with artificial viscosity. I am wondering if anyone has encountered this issue before?
I have attached my input as a text file. Please let me know what my issue might be. This is in a 2D domain with about 147k particles.