Description

Structure with SPH method parameters.

#include <ChFsiFluidSystemSPH.h>

Public Attributes
IntegrationScheme	integration_scheme
	Integration scheme (default: RK2)

EosType	eos_type
	equation of state (default: ISOTHERMAL)

ViscosityMethod	viscosity_method
	viscosity treatment (default: ARTIFICIAL_UNILATERAL)

BoundaryMethod	boundary_method
	boundary treatment (default: ADAMI)

KernelType	kernel_type
	kernel type (default: CUBIC_SPLINE)

ShiftingMethod	shifting_method
	shifting method (default: XSPH)

int	num_bce_layers
	number of BCE layers (boundary and solids, default: 3)

double	initial_spacing
	initial particle spacing (default: 0.01)

double	d0_multiplier
	kernel length multiplier, h = d0_multiplier * initial_spacing (default: 1.2)

double	max_velocity
	maximum velocity (default: 1.0)

double	shifting_xsph_eps
	XSPH coefficient (default: 0.5)

double	shifting_ppst_push
	PPST pushing coefficient (default: 3.0)

double	shifting_ppst_pull
	shifting beta coefficient (default: 1.0)

double	shifting_beta_implicit
	shifting coefficient used in implicit solver (default: 1.0)

double	shifting_diffusion_A
	Fickian shifting coefficient, scaling the shifting velocity driven by the discrete gradient of particle concentration (default: 1.0, range 1 to 6)

double	shifting_diffusion_AFSM
	upper anchor of the free-surface taper on diffusion shifting: particles whose position-field divergence reaches AFSM get the full shift, and between AFST and AFSM the shift ramps linearly (default: 2.9)

double	shifting_diffusion_AFST
	lower anchor of the free-surface taper on diffusion shifting: particles whose position-field divergence is at or below AFST are not shifted (default: 2.0)

double	min_distance_coefficient
	min inter-particle distance as fraction of kernel radius (default: 0.01)

int	density_reinit_steps
	number of steps between density re-initializations (default: 2e8)

bool	use_density_based_projection
	(ISPH only, default: false)

bool	use_consistent_gradient_discretization
	use G matrix in SPH gradient approximation (default: false)

bool	use_consistent_laplacian_discretization
	use L matrix in SPH Laplacian approximation (default: false)

double	artificial_viscosity
	artificial viscosity coefficient (default: 0.02)

bool	use_delta_sph
	use delta SPH (default: true)

double	delta_sph_coefficient
	delta SPH coefficient (default: 0.1)

double	free_surface_threshold
	threshold for identifying free surface. More...

int	num_proximity_search_steps
	number of steps between updates to neighbor lists (default: 1)

bool	use_variable_time_step
	use variable time step (default: false)

Member Data Documentation

◆ free_surface_threshold

double chrono::fsi::sph::ChFsiFluidSystemSPH::SPHParameters::free_surface_threshold

threshold for identifying free surface.

The divergence of the position field is computed and compared to this threshold. Particles with divergence less than this threshold are considered free surface particles. Evaluated for both CFD and CRM problems, but currently only the CRM solution consumes the result (the stress state is zeroed at flagged particles); default: 2.4

The documentation for this struct was generated from the following files:

/builds/uwsbel/chrono/src/chrono_fsi/sph/ChFsiFluidSystemSPH.h
/builds/uwsbel/chrono/src/chrono_fsi/sph/ChFsiFluidSystemSPH.cpp

Description

Public Attributes

Member Data Documentation

◆ free_surface_threshold