Description

Class to represent the fluid/granular dynamics system.

This class is used to represent a fluid/granular system and take care of the time integration of the fluid/granular dynamics. This is a class designed for base SPH simulation. The class holds pointer to data, which is hold somewhere else. It also include a forceSystem, which takes care of the computation of force between particles. The forceSystem is owned by the class FsiForce.

Collaboration diagram for chrono::fsi::sph::FluidDynamics:

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Public Member Functions
	FluidDynamics (FsiDataManager &data_mgr, BceManager &bce_mgr, bool verbose)
	Constructor of the fluid/granular dynamics class. More...

	~FluidDynamics ()
	Destructor of the fluid/granular dynamics class.

void	SortParticles ()
	Sort particles.

void	IntegrateSPH (std::shared_ptr< SphMarkerDataD > sortedSphMarkers2_D, std::shared_ptr< SphMarkerDataD > sortedSphMarkers1_D, Real dT, Real time, bool firstHalfStep=true)
	Integrate the fluid/granular system in time. More...

void	CopySortedToOriginal (MarkerGroup group, std::shared_ptr< SphMarkerDataD > sortedSphMarkersD2, std::shared_ptr< SphMarkerDataD > sphMarkersD)
	Copy markers in the specified group from sorted arrays to original-order arrays.

void	DensityReinitialization ()
	Function to Shepard Filtering. More...

void	Initialize ()
	Synchronize the copy of the data between device (GPU) and host (CPU). More...

std::shared_ptr< FsiForce >	GetForceSystem ()
	Return the FsiForce type used in the simulation.

void	UpdateActivity (std::shared_ptr< SphMarkerDataD > sphMarkersD)
	Update activity of SPH particles. More...

Protected Member Functions
void	UpdateFluid (std::shared_ptr< SphMarkerDataD > sortedSphMarkersD, Real dT)
	Update SPH particles data for explicit integration.

void	ApplyBoundarySPH_Markers (std::shared_ptr< SphMarkerDataD > sortedSphMarkersD)
	Apply periodic boundary to the normal SPH particles.

void	ApplyModifiedBoundarySPH_Markers (std::shared_ptr< SphMarkerDataD > sphMarkersD)
	Modify the velocity of BCE particles. More...

Protected Attributes
FsiDataManager &	m_data_mgr
	FSI data manager.

std::shared_ptr< FsiForce >	forceSystem
	force system object; calculates the force between particles

bool	m_verbose

Constructor & Destructor Documentation

◆ FluidDynamics()

chrono::fsi::sph::FluidDynamics::FluidDynamics	(	FsiDataManager &	data_mgr,
		BceManager &	bce_mgr,
		bool	verbose
	)

Constructor of the fluid/granular dynamics class.

Instantiate FsiForce, i.e. force system;
Copy the pointer to SPH particle data, parameters, and number of objects to member variables.

Parameters

data_mgr	FSI data manager
bce_mgr	BCE manager
verbose	verbose output

Member Function Documentation

◆ ApplyModifiedBoundarySPH_Markers()

void chrono::fsi::sph::FluidDynamics::ApplyModifiedBoundarySPH_Markers ( std::shared_ptr< SphMarkerDataD > sphMarkersD )

protected

Modify the velocity of BCE particles.

TODO (Huzaifa) - Might need to deprecated this function.

◆ DensityReinitialization()

void chrono::fsi::sph::FluidDynamics::DensityReinitialization ( )

Function to Shepard Filtering.

It calculates the densities directly, not based on the derivative of the density. This function is used in addition to the density update in UpdateFluid.

◆ Initialize()

void chrono::fsi::sph::FluidDynamics::Initialize ( )

Synchronize the copy of the data between device (GPU) and host (CPU).

Including the parameters and number of objects. This function needs to be called once the host data are modified.

◆ IntegrateSPH()

void chrono::fsi::sph::FluidDynamics::IntegrateSPH	(	std::shared_ptr< SphMarkerDataD >	sortedSphMarkers2_D,
		std::shared_ptr< SphMarkerDataD >	sortedSphMarkers1_D,
		Real	dT,
		Real	time,
		bool	firstHalfStep = `true`
	)

Integrate the fluid/granular system in time.

The underlying SPH method implementation goes inside this function. In a explicit scheme, to perform the integration, the force system calculates the forces between the particles. Then the forces are used to to update the particles position, velocity, and density in time, the latter is used to update the pressure from an equation of state. In the implicit scheme, the pressures are updated instead of density.

Parameters

sortedSphMarkers2_D	SPH particle information at the second half step
sortedSphMarkers1_D	SPH particle information at the first half step
dT	simulation stepsize
time	simulation time
firstHalfStep	flag to indicate the first half step in case of explicit integration

◆ UpdateActivity()

void chrono::fsi::sph::FluidDynamics::UpdateActivity ( std::shared_ptr< SphMarkerDataD > sphMarkersD )

Update activity of SPH particles.

SPH particles which are in an active domain (e.g., close to a solid) are set as active particles.

The documentation for this class was generated from the following file:

/builds/uwsbel/chrono/src/chrono_fsi/sph/physics/FluidDynamics.cuh