Solid to SPH Option (Sol2SPH)

The solid to SPH option (Sol2SPH) enables you to turn a solid element into particles in order to increase the time step/robustness of a Lagrangian calculation, while not significantly changing the physics.

It is compatible with the solid property options /PROP/TYPE14 (SOLID) and /PROP/TYPE6 (SOL_ORTH) and is limited to:
  • Isolid = 1, 2 or 24
  • Iframe = 1 or 2
  • 8-node bricks (/BRICK including degenerated) and 4-node tetras (TETRA4), but not 10-node tetras.
The input is:
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/PROP/SOLID/3
Prop example
#   Isolid    Ismstr               Icpre  Itetra10     Inpts   Itetra4    Iframe                  dn
        24        -1                  -1         0         0         0        -1                 0.0
#                q_a                 q_b                   h            LAMBDA_V                MU_V
                 0.0                 0.0                 0.0                 0.0                 0.0
#         deltaT_min            Vdef_min            Vdef_max             ASP_max             COL_min
                 0.0                 0.0                 0.0                 0.0                 0.0
#     Ndir sphpartID  Icontrol
         1        10         0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
Where,
SPH_part
Part number defining the SPH properties
Ndir
Number of particles created for each direction, the maximum value is 9
Table 1. 8 Nodes Brick


The particles are created according to a cubic net.
Table 2. 4 Nodes Tetra

The transition from solid elements to SPH particles can be triggered by contact or by brick deletion.