I simulated a water entry problem with DualSPHysics. But I noticed that a small gap between fluid and boundary particles always occured, especially when the particle distance is large. After reading User Guide, it said 1.5*h is set between fluid and boundary particles. I'm confused that when I build the geometric model, should I shrink or enlarge the model's boundary size with 1.5*h in order to fit the exact size of my original model?
Thank you very much!