Today I was trying to model a rainfall infiltration using the Richards flow process. I have applied a rainfall intensity of 45.4mm/day for a 5-day period and then an extra 10 days to monitor post rainfall behaviour. I am not much satisfied with the result obtained from the Richards flow process. So, I prepared another model with the Richards mechanics process but with zero displacement boundary throughout the domain (which basically turns the Richards mechanics process into the Richards flow process).
I did a comparative study and observe, water seepage after the rainfall is unnoticeable in Richards flow but seen in the Richards Mechanics process.
Could anybody check my test model and suggest to me why this is happening?