Description

SPH-based fluid solver and FSI interface This sub-module provides a Smoothed Particle Hydrodynamics fluid solver with support for:

incompressible Navier-Stokes, and
continuous representation model for terramechanics.

Collaboration diagram for SPH-based FSI module:

Modules
	Physics objects

	Math support

	Utilities

	Visualization

Namespaces
namespace	chrono::fsi::sph::PeriodicSide
	Enumeration for specifying whether the sides of a computational domain are periodic or not.

namespace	chrono::fsi::sph::BoxSide
	Enumeration for box sides.

namespace	chrono::fsi::sph::CylSide
	Enumeration for cylinder sides.

Classes
struct	chrono::fsi::sph::Real2
	Pair of reals. More...

struct	chrono::fsi::sph::Real3
	Triplet of reals. More...

struct	chrono::fsi::sph::Real4
	Quadruplet of reals. More...

struct	chrono::fsi::sph::RealAABB
	Axis-aligned bounding box (real coordinates). More...

struct	chrono::fsi::sph::IntAABB
	Axis-aligned bounding box (integer grid coordinates). More...

struct	chrono::fsi::sph::BoundaryConditions
	Boundary condition types in all three directions of the computational domain. More...

class	chrono::fsi::sph::ChFsiFluidSystemSPH
	Physical system for an FSI-aware SPH fluid solver. More...

class	chrono::fsi::sph::ChFsiInterfaceSPH
	Custom FSI interface between a Chrono multibody system and the SPH-based fluid system. More...

struct	chrono::fsi::sph::ChFsiParamsSPH
	Structure with FSI simulation parameters. More...

class	chrono::fsi::sph::ChFsiProblemSPH
	Base class to set up a Chrono::FSI problem. More...

class	chrono::fsi::sph::ChFsiProblemCartesian
	Class to set up a Chrono::FSI problem using particles and markers on a Cartesian coordinates grid. More...

class	chrono::fsi::sph::ChFsiProblemWavetank
	Class to construct a wavetank with a rigid piston or flap wavemaker mechanism. More...

class	chrono::fsi::sph::ChFsiProblemCylindrical
	Class to set up a Chrono::FSI problem using particles and markers on a cylindrical coordinates grid. More...

class	chrono::fsi::sph::DepthPressurePropertiesCallback
	Predefined SPH particle initial properties callback (depth-based pressure). More...

class	chrono::fsi::sph::WaveTankRampBeach
	Predefined wave tank profile with a ramp beach. More...

class	chrono::fsi::sph::WaveTankParabolicBeach
	Predefined wave tank profile with a parabolic beach. More...

class	chrono::fsi::sph::ChFsiSystemSPH
	FSI system using an SPH-based fluid solver. More...

Typedefs
typedef float	chrono::fsi::sph::Real
	Real type used in the SPH Chrono::FSI module (float or double).

typedef unsigned int	chrono::fsi::sph::uint
	Unsigned int type used in the SPH Chrono::FSI module.

typedef unsigned short	chrono::fsi::sph::ushort
	Unsigned short type used in the SPH Chrono::FSI module.

Enumerations
enum class	chrono::fsi::sph::PhysicsProblem { chrono::fsi::sph::PhysicsProblem::CFD , chrono::fsi::sph::PhysicsProblem::CRM }
	Physics problem type. More...

enum class	chrono::fsi::sph::IntegrationScheme { chrono::fsi::sph::IntegrationScheme::EULER , chrono::fsi::sph::IntegrationScheme::RK2 , chrono::fsi::sph::IntegrationScheme::VERLET , chrono::fsi::sph::IntegrationScheme::SYMPLECTIC , chrono::fsi::sph::IntegrationScheme::IMPLICIT_SPH }
	Integration scheme. More...

enum class	chrono::fsi::sph::ShiftingMethod { NONE , PPST , XSPH , PPST_XSPH , DIFFUSION , DIFFUSION_XSPH }
	Shifting Methods.

enum class	chrono::fsi::sph::EosType { TAIT , ISOTHERMAL }
	Equation of State type. More...

enum class	chrono::fsi::sph::KernelType { QUADRATIC , CUBIC_SPLINE , QUINTIC_SPLINE , WENDLAND }
	SPH kernel type.

enum class	chrono::fsi::sph::ViscosityMethod { LAMINAR , ARTIFICIAL_UNILATERAL , ARTIFICIAL_BILATERAL }
	Visosity method type.

enum class	chrono::fsi::sph::BoundaryMethod { ADAMI , HOLMES }
	Boundary method type.

enum class	chrono::fsi::sph::Rheology { INERTIA_RHEOLOGY , NONLOCAL_FLUIDITY }
	Rheology type.

enum class	chrono::fsi::sph::FrictionLaw { CONSTANT , LINEAR , NONLINEAR }
	Friction law in ISPH.

enum class	chrono::fsi::sph::SolverType { JACOBI , BICGSTAB , GMRES , CR , CG , SAP }
	Linear solver type.

enum class	chrono::fsi::sph::RheologyCRM { MU_OF_I , MCC }
	Rheology for CRM Mu_of_I: Rate dependent friction law MCC: Modified Cam Clay with hardening.

enum class	chrono::fsi::sph::BCType { chrono::fsi::sph::BCType::NONE , chrono::fsi::sph::BCType::PERIODIC , chrono::fsi::sph::BCType::INLET_OUTLET }
	Boundary conditions along directions of the computational domain. More...

enum class	chrono::fsi::sph::NodeDirections { NONE , AVERAGE , EXACT }
	Methods for FEA node direction information.

enum class	chrono::fsi::sph::BcePatternMesh1D { FULL , STAR }
	BCE pattern in cross section of 1-D flexible elements. More...

enum class	chrono::fsi::sph::BcePatternMesh2D { CENTERED , OUTWARD , INWARD }
	BCE pattern along normal of 2-D surface of flexible elements. More...

enum class	chrono::fsi::sph::OutputLevel { chrono::fsi::sph::OutputLevel::STATE , chrono::fsi::sph::OutputLevel::STATE_PRESSURE , chrono::fsi::sph::OutputLevel::CFD_FULL , chrono::fsi::sph::OutputLevel::CRM_FULL }
	Output level. More...

Functions
std::ostream &	chrono::fsi::sph::operator<< (std::ostream &out, const Real2 &v)
	Insertion of a Real2 to output stream.

std::ostream &	chrono::fsi::sph::operator<< (std::ostream &out, const Real3 &v)
	Insertion of a Real3 to output stream.

std::ostream &	chrono::fsi::sph::operator<< (std::ostream &out, const Real4 &v)
	Insertion of a Real4 to output stream.

Variables
constexpr BoundaryConditions	chrono::fsi::sph::BC_NONE = {BCType::NONE, BCType::NONE, BCType::NONE}

constexpr BoundaryConditions	chrono::fsi::sph::BC_X_PERIODIC = {BCType::PERIODIC, BCType::NONE, BCType::NONE}

constexpr BoundaryConditions	chrono::fsi::sph::BC_Y_PERIODIC = {BCType::NONE, BCType::PERIODIC, BCType::NONE}

constexpr BoundaryConditions	chrono::fsi::sph::BC_Z_PERIODIC = {BCType::NONE, BCType::NONE, BCType::PERIODIC}

constexpr BoundaryConditions	chrono::fsi::sph::BC_ALL_PERIODIC = {BCType::PERIODIC, BCType::PERIODIC, BCType::PERIODIC}

Enumeration Type Documentation

◆ BcePatternMesh1D

enum class chrono::fsi::sph::BcePatternMesh1D

strong

BCE pattern in cross section of 1-D flexible elements.

The available patterns are illustrated below (assuming 3 BCE layers):

FULL:
     X--X--X
     X--X--X
     X--X--X
STAR:
     ---X---
     X--X--X
     ---X---

◆ BcePatternMesh2D

enum class chrono::fsi::sph::BcePatternMesh2D

strong

BCE pattern along normal of 2-D surface of flexible elements.

The choices are illustrated below (assuming 3 BCE layers):

OUTWARD:
   ^ n
   |    ...--X--X--X--...
   |    ...--X--X--X--...
---|---------X--X--X-------- surface

CENTERED:
   ^ n
   |    ...--X--X--X--...
---|---------X--X--X-------- surface
   |    ...--X--X--X--...

INWARD:
   ^ n
---|---------X--X--X-------- surface
   |    ...--X--X--X--...
   |    ...--X--X--X--...

◆ BCType

enum class chrono::fsi::sph::BCType

strong

Boundary conditions along directions of the computational domain.

Enumerator
NONE	no boundary conditions enforced
PERIODIC	periodic boundary conditions
INLET_OUTLET	inlet-outlet boundary conditions

◆ EosType

enum class chrono::fsi::sph::EosType

strong

Equation of State type.

See https://pysph.readthedocs.io/en/latest/reference/equations.html#basic-wcsph-equations. An equation of state is used only with an explicit WCSPH formulation.

◆ IntegrationScheme

enum class chrono::fsi::sph::IntegrationScheme

strong

Integration scheme.

All explicit integratioon schemes use a Weakly-Compressible SPH (WCSPH) formulation in which the density is integrated and an equation of state is used to calculate the corresponding pressure. For the implicit SPH scheme, the pressure is instead updated.

Enumerator
EULER	Explicit Euler.
RK2	Runge-Kutta 2.
VERLET	Velocity Verlet.
SYMPLECTIC	Symplectic Euler.
IMPLICIT_SPH	Implicit SPH.

◆ OutputLevel

enum class chrono::fsi::sph::OutputLevel

strong

Output level.

Enumerator
STATE	marker state, velocity, and acceleration
STATE_PRESSURE	STATE plus density and pressure.
CFD_FULL	STATE_PRESSURE plus various CFD parameters.
CRM_FULL	STATE_PRESSURE plus normal and shear stress.

◆ PhysicsProblem

enum class chrono::fsi::sph::PhysicsProblem

strong

Physics problem type.

Enumerator
CFD	incompressible fluid problem
CRM	continuous granular problem

Description

Modules

Namespaces

Classes

Typedefs

Enumerations

Functions

Variables

Enumeration Type Documentation

◆ BcePatternMesh1D

◆ BcePatternMesh2D

◆ BCType

◆ EosType

◆ IntegrationScheme

◆ OutputLevel

◆ PhysicsProblem