I Designed a concrete Capsule and tested in DualSPHysics. When inter particle distance set to 0.02, Simulation looks good. It floats vertically because most of the weight is at bottom that’s why gravity center is not in the middle. However resolution is too low, thus I decided to change it from 0.02 to 0.01. Simulation of DualSPHysics changed the gravity center and object float horizontal on the water surface. It is impossible because almost %30 weight is at bottom. Problem suppose to be conversion of solid model from low to better definition. Bottom side is not a hole however it removed bottom side thus volume of capsule got less and it's weight thus gravity center was changed perhaps.