[acasas]

Hi there.
I have many questions about this simulation. Hopefully I´ll capture the attention of this forum members and get some help. I'll be adding those questions one after another so you don't get bored. I more or less have been successful in simulating a body slamming against water when dropped from 1m above water surface, flowing at 27m/sec, and getting stresses and deformations. This is a 2 way FSI between transient structural and fluent, using open channel and explicit method with two phases being air and water.

My first question is: if the water and air is flowing at 27 m/s , the body falls (due to gravity) from 1m above water level, and its dimensions are 15m length, and about 4 m2 cross section, what should be the dimensions of my "open channel box", and what height should I use for the water level from the bottom? Should my flow be subcritical or supercritical.If supercritical, then my water level should be higher than y>V^2/9.81 >74m from the bottom?
The total time period i´m using its about 0.6 to 0.8 seconds. The time step about .0074 for a minimum cell size of 0.2m .
I'm open to any other suggestions.
Thanks