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SPH- Smoothed Particle Hydrodynamics and Type7 interface

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Good morning to everybody


I'm working on ditching bodies in water, modelling it with SPH elements, and the bodies like rigid bodies.


I use interface type7, as master i take the body surface, and slave nodes i take the sph elements (nodes);


In interface edit panel, i use Istf=1 (just 0 and 1 avaible for sph formulation) and here we came to my need:


i have to calculate the interface stifness (with istf=1 STFAC=costant interface sifness), between water and body,


because from this depends in a large part the time step, but i don't know how. 


Should i consider a simple average value between bulk modulus of water and young modulus of body material,


or a average weighted value, by a characteristic of entry in water, like entry speed or water height...


thanks to all






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