LS-DYNA provides two types of Smoothed Particle Galerkin (SPG) solvers:
The standard SPG solver used in the simulation of destructive manufacturing process such as riveting, screwing, drilling, and machining.
The Incompressible SPG (ISPG) Solver used for the simulation of incompressible free surface fluid flow such as the reflow process of solder joints in electronic equipment.
SPG and ISPG are mesh-free methods that use a finite element mesh, unlike SPH which requires the generation of a specific particle mesh. The SPG and ISPG bodies must be solid.
To apply SPG or ISPG methods on a part, scope the part in a section object with the method property set to SPG or ISPG. Additional information on SPG and ISPG are described in the following items:
To handle the interaction between a finite element part and an ISPG part, there is a new coupling object called ISPG to Surface Coupling. For additional information on this object, see:
To use the ISPG solver, the Solver Precision in the Analysis Settings must be Double and the mesh for the ISPG body must use tetrahedral elements. If these two conditions are not met, error messages that indicate the problem will be generated.
When you are using MPP for an SPG analysis, the card *CONTROL_MPP_DECOMPOSITION_PARTS_DISTRIBUTE is written to the input file. This card specifies the ID of a *SET_PART_LIST that includes all SPG part IDs. For further details, see *CONTROL_MPP_DECOMPOSITION_PARTS_DISTRIBUTE in the LS-DYNA Keyword and Theory Manuals.