Fixed the implementations of surface tension models from the following papers:
1) M. Shadloo, M. Yildiz, "Numerical modelling of Kelvin-Helmholtz
instability using smoothed particle hydrodynamics", IJNME, 2011
2) Adami et al. "A new surface-tension formulation for multi-phase SPH
using a reproducing divergence approximation", JCP 2010
3) X.Y.Hu, N.A. Adams. "A multi-phase SPH method for macroscopic and
mesoscopic flows", JCP 2006
Fixed the implementations of surface tension models from the following papers:
1) M. Shadloo, M. Yildiz, "Numerical modelling of Kelvin-Helmholtz instability using smoothed particle hydrodynamics", IJNME, 2011 2) Adami et al. "A new surface-tension formulation for multi-phase SPH using a reproducing divergence approximation", JCP 2010 3) X.Y.Hu, N.A. Adams. "A multi-phase SPH method for macroscopic and mesoscopic flows", JCP 2006