#### Command list

• Input handling
• Solution control and techniques
• Output
• Mesh commands
• Nodes and connectivity
• Material properties
• Initial conditions
• Boundary conditions
• Contact and tied interfaces
• Rigid bodies
• Connectors
• Parameters and functions
• Geometries
• Sets
• Coordinate system
• Particle
• SPH

### PARTICLE_DOMAIN

###### Particle
*PARTICLE_DOMAIN
entype, enid, N${}_p$, $\mu$, $pfac$, $c_{dec}$, xsmooth, $t_{end}$
$x_0$, $y_0$, $z_0$, $x_1$, $y_1$, $z_1$
bc${}_{x0}$, bc${}_{y0}$, bc${}_{z0}$, bc${}_{x1}$, bc${}_{y1}$, bc${}_{z1}$
$\delta_0^{max}$

#### Parameter definition

VariableDescription
entype Structure entity type for particle structure interaction
options: P, PS, ALL
enid Structure entity ID
N${}_p$ Total number of particles
$\mu$ Particle-structure contact friction
$pfac$ Particle-structure contact stiffness
$c_{dec}$ Impulse transfer smoothing time (gas-structure)
xsmooth Spatial impulse smoothing level
default: inactive
$t_{end}$ Particle deactivation time
$x_0$ Particle domain minimum x-coordinate
$y_0$ Particle domain minimum y-coordinate
$z_0$ Particle domain minimum z-coordinate
$x_1$ Particle domain maximum x-coordinate
$y_1$ Particle domain maximum y-coordinate
$z_1$ Particle domain maximum z-coordinate
bc${}_{x0}$ Boundary condition at $x=x_0$
options:
0 $\rightarrow$ free
1 $\rightarrow$ rigid reflecting boundary
2 $\rightarrow$ fully clamped (SPH only)
bc${}_{y0}$ Boundary condition at $y=y_0$
options:
0 $\rightarrow$ free
1 $\rightarrow$ rigid reflecting boundary
2 $\rightarrow$ fully clamped (SPH only)
bc${}_{z0}$ Boundary condition at $z=z_0$
options:
0 $\rightarrow$ free
1 $\rightarrow$ rigid reflecting boundary
2 $\rightarrow$ fully clamped (SPH only)
bc${}_{x1}$ Boundary condition at $x=x_1$
options:
0 $\rightarrow$ free
1 $\rightarrow$ rigid reflecting boundary
2 $\rightarrow$ fully clamped (SPH only)
bc${}_{y1}$ Boundary condition at $y=y_1$
options:
0 $\rightarrow$ free
1 $\rightarrow$ rigid reflecting boundary
2 $\rightarrow$ fully clamped (SPH only)
bc${}_{z1}$ Boundary condition at $z=z_1$
options:
0 $\rightarrow$ free
1 $\rightarrow$ rigid reflecting boundary
2 $\rightarrow$ fully clamped (SPH only)
$\delta_0^{max}$ Max allowed initial contact penetration
default: 0

#### Description

Discrete particle global domain definition.

The spatial impulse smoothing option smears out transferred impulses to more than one element face. xsmooth is an integer that defines the size of the region where impulses are distributed. xsmooth=1 means that only the direct neighbours of an impacted face will share a fraction of the impulse. With xsmooth=2 the impulse is distributed to both the direct and to the second level neighbours. Typical xsmooth parameters are in the range 1 to 10.

Particles overlapping the underlying Finite Element mesh by more than $\delta_0^{max}$ will be removed from the model during initialization.