2-D Fluid-Implicit Particle (FLIP) implementation. More...

#include <Core/Solver/Hybrid/FLIP/FLIPSolver2.hpp>

Inheritance diagram for CubbyFlow::FLIPSolver2:

Classes
class	Builder
	Front-end to create FLIPSolver2 objects step by step. More...

Public Member Functions
	FLIPSolver2 ()
	Default constructor. More...

	FLIPSolver2 (const Vector2UZ &resolution, const Vector2D &gridSpacing, const Vector2D &gridOrigin)
	Constructs solver with initial grid size. More...

	FLIPSolver2 (const FLIPSolver2 &)=delete
	Deleted copy constructor. More...

	FLIPSolver2 (FLIPSolver2 &&) noexcept=delete
	Deleted move constructor. More...

	~FLIPSolver2 () override=default
	Default virtual destructor. More...

FLIPSolver2 &	operator= (const FLIPSolver2 &)=delete
	Deleted copy assignment operator. More...

FLIPSolver2 &	operator= (FLIPSolver2 &&) noexcept=delete
	Deleted move assignment operator. More...

double	GetPICBlendingFactor () const
	Returns the PIC blending factor. More...

void	SetPICBlendingFactor (double factor)
	Sets the PIC blending factor. More...

Public Member Functions inherited from CubbyFlow::PICSolver2
	PICSolver2 ()
	Default constructor. More...

	PICSolver2 (const Vector2UZ &resolution, const Vector2D &gridSpacing, const Vector2D &gridOrigin)
	Constructs solver with initial grid size. More...

	PICSolver2 (const PICSolver2 &)=delete
	Deleted copy constructor. More...

	PICSolver2 (PICSolver2 &&) noexcept=delete
	Deleted move constructor. More...

	~PICSolver2 () override=default
	Default virtual destructor. More...

PICSolver2 &	operator= (const PICSolver2 &)=delete
	Deleted copy assignment operator. More...

PICSolver2 &	operator= (PICSolver2 &&) noexcept=delete
	Deleted move assignment operator. More...

ScalarGrid2Ptr	GetSignedDistanceField () const
	Returns the signed-distance field of particles. More...

const ParticleSystemData2Ptr &	GetParticleSystemData () const
	Returns the particle system data. More...

const ParticleEmitter2Ptr &	GetParticleEmitter () const
	Returns the particle emitter. More...

void	SetParticleEmitter (const ParticleEmitter2Ptr &newEmitter)
	Sets the particle emitter. More...

Public Member Functions inherited from CubbyFlow::GridFluidSolver2
	GridFluidSolver2 ()
	Default constructor. More...

	GridFluidSolver2 (const Vector2UZ &resolution, const Vector2D &gridSpacing, const Vector2D &gridOrigin)
	Constructs solver with initial grid size. More...

	GridFluidSolver2 (const GridFluidSolver2 &)=delete
	Deleted copy constructor. More...

	GridFluidSolver2 (GridFluidSolver2 &&) noexcept=delete
	Deleted move constructor. More...

	~GridFluidSolver2 () override=default
	Default virtual destructor. More...

GridFluidSolver2 &	operator= (const GridFluidSolver2 &)=delete
	Deleted copy assignment operator. More...

GridFluidSolver2 &	operator= (GridFluidSolver2 &&) noexcept=delete
	Deleted move assignment operator. More...

const Vector2D &	GetGravity () const
	Returns the gravity vector of the system. More...

void	SetGravity (const Vector2D &newGravity)
	Sets the gravity of the system. More...

double	GetViscosityCoefficient () const
	Returns the viscosity coefficient. More...

void	SetViscosityCoefficient (double newValue)
	Sets the viscosity coefficient. More...

double	GetCFL (double timeIntervalInSeconds) const
	Returns the CFL number from the current velocity field for given time interval. More...

double	GetMaxCFL () const
	Returns the max allowed CFL number. More...

void	SetMaxCFL (double newCFL)
	Sets the max allowed CFL number. More...

bool	GetUseCompressedLinearSystem () const
	Returns true if the solver is using compressed linear system. More...

void	SetUseCompressedLinearSystem (bool isOn)
	Sets whether the solver should use compressed linear system. More...

const AdvectionSolver2Ptr &	GetAdvectionSolver () const
	Returns the advection solver instance. More...

void	SetAdvectionSolver (const AdvectionSolver2Ptr &newSolver)
	Sets the advection solver. More...

const GridDiffusionSolver2Ptr &	GetDiffusionSolver () const
	Returns the diffusion solver instance. More...

void	SetDiffusionSolver (const GridDiffusionSolver2Ptr &newSolver)
	Sets the diffusion solver. More...

const GridPressureSolver2Ptr &	GetPressureSolver () const
	Returns the pressure solver instance. More...

void	SetPressureSolver (const GridPressureSolver2Ptr &newSolver)
	Sets the pressure solver. More...

int	GetClosedDomainBoundaryFlag () const
	Returns the closed domain boundary flag. More...

void	SetClosedDomainBoundaryFlag (int flag)
	Sets the closed domain boundary flag. More...

const GridSystemData2Ptr &	GetGridSystemData () const
	Returns the grid system data. More...

void	ResizeGrid (const Vector2UZ &newSize, const Vector2D &newGridSpacing, const Vector2D &newGridOrigin) const
	Resizes grid system data. More...

Vector2UZ	GetResolution () const
	Returns the resolution of the grid system data. More...

Vector2D	GetGridSpacing () const
	Returns the grid spacing of the grid system data. More...

Vector2D	GetGridOrigin () const
	Returns the origin of the grid system data. More...

const FaceCenteredGrid2Ptr &	GetVelocity () const
	Returns the velocity field. More...

const Collider2Ptr &	GetCollider () const
	Returns the collider. More...

void	SetCollider (const Collider2Ptr &newCollider)
	Sets the collider. More...

const GridEmitter2Ptr &	GetEmitter () const
	Returns the emitter. More...

void	SetEmitter (const GridEmitter2Ptr &newEmitter)
	Sets the emitter. More...

Public Member Functions inherited from CubbyFlow::PhysicsAnimation
	PhysicsAnimation ()
	Default constructor. More...

	PhysicsAnimation (const PhysicsAnimation &)=default
	Default copy constructor. More...

	PhysicsAnimation (PhysicsAnimation &&) noexcept=default
	Default move constructor. More...

virtual	~PhysicsAnimation ()=default
	Default virtual destructor. More...

PhysicsAnimation &	operator= (const PhysicsAnimation &)=default
	Default copy assignment operator. More...

PhysicsAnimation &	operator= (PhysicsAnimation &&) noexcept=default
	Default move assignment operator. More...

bool	GetIsUsingFixedSubTimeSteps () const
	Returns true if fixed sub-timestepping is used. More...

void	SetIsUsingFixedSubTimeSteps (bool isUsing)
	Sets true if fixed sub-timestepping is used. More...

unsigned int	GetNumberOfFixedSubTimeSteps () const
	Returns the number of fixed sub-timesteps. More...

void	SetNumberOfFixedSubTimeSteps (unsigned int numberOfSteps)
	Sets the number of fixed sub-timesteps. More...

void	AdvanceSingleFrame ()
	Advances a single frame. More...

Frame	GetCurrentFrame () const
	Returns current frame. More...

void	SetCurrentFrame (const Frame &frame)
	Sets current frame cursor (but do not invoke update()). More...

double	GetCurrentTimeInSeconds () const
	Returns current time in seconds. More...

Public Member Functions inherited from CubbyFlow::Animation
	Animation ()=default
	Default constructor. More...

	Animation (const Animation &)=default
	Default copy constructor. More...

	Animation (Animation &&) noexcept=default
	Default move constructor. More...

virtual	~Animation ()=default
	Default virtual destructor. More...

Animation &	operator= (const Animation &)=default
	Default copy assignment operator. More...

Animation &	operator= (Animation &&) noexcept=default
	Default move assignment operator. More...

void	Update (const Frame &frame)
	Updates animation state for given `frame`. More...

Static Public Member Functions
static Builder	GetBuilder ()
	Returns builder fox FLIPSolver2. More...

Static Public Member Functions inherited from CubbyFlow::PICSolver2
static Builder	GetBuilder ()
	Returns builder fox PICSolver2. More...

Static Public Member Functions inherited from CubbyFlow::GridFluidSolver2
static Builder	GetBuilder ()
	Returns builder fox GridFluidSolver2. More...

Protected Member Functions
void	TransferFromParticlesToGrids () override
	Transfers velocity field from particles to grids. More...

void	TransferFromGridsToParticles () override
	Transfers velocity field from grids to particles. More...

Protected Member Functions inherited from CubbyFlow::PICSolver2
void	OnInitialize () override
	Initializes the simulator. More...

void	OnBeginAdvanceTimeStep (double timeIntervalInSeconds) override
	Invoked before a simulation time-step begins. More...

void	ComputeAdvection (double timeIntervalInSeconds) override
	Computes the advection term of the fluid solver. More...

ScalarField2Ptr	GetFluidSDF () const override
	Returns the signed-distance field of the fluid. More...

virtual void	MoveParticles (double timeIntervalInSeconds)
	Moves particles. More...

Protected Member Functions inherited from CubbyFlow::GridFluidSolver2
void	OnAdvanceTimeStep (double timeIntervalInSeconds) override
	Called when advancing a single time-step. More...

unsigned int	GetNumberOfSubTimeSteps (double timeIntervalInSeconds) const override
	Returns the required sub-time-steps for given time interval. More...

virtual void	OnEndAdvanceTimeStep (double timeIntervalInSeconds)
	Called at the end of a time-step. More...

virtual void	ComputeExternalForces (double timeIntervalInSeconds)
	Computes the external force terms. More...

virtual void	ComputeViscosity (double timeIntervalInSeconds)
	Computes the viscosity term using the diffusion solver. More...

virtual void	ComputePressure (double timeIntervalInSeconds)
	Computes the pressure term using the pressure solver. More...

void	ComputeGravity (double timeIntervalInSeconds)
	Computes the gravity term. More...

void	ApplyBoundaryCondition () const
	Applies the boundary condition to the velocity field. More...

void	ExtrapolateIntoCollider (ScalarGrid2 *grid)
	Extrapolates given field into the collider-occupied region. More...

void	ExtrapolateIntoCollider (CollocatedVectorGrid2 *grid)
	Extrapolates given field into the collider-occupied region. More...

void	ExtrapolateIntoCollider (FaceCenteredGrid2 *grid)
	Extrapolates given field into the collider-occupied region. More...

ScalarField2Ptr	GetColliderSDF () const
	Returns the signed-distance field representation of the collider. More...

VectorField2Ptr	GetColliderVelocityField () const
	Returns the velocity field of the collider. More...

Additional Inherited Members
Protected Attributes inherited from CubbyFlow::PICSolver2
Array2< char >	m_uMarkers

Array2< char >	m_vMarkers

Detailed Description

2-D Fluid-Implicit Particle (FLIP) implementation.

This class implements 2-D Fluid-Implicit Particle (FLIP) solver from the SIGGRAPH paper, Zhu and Bridson 2005. By transferring delta-velocity field from grid to particles, the FLIP solver achieves less viscous fluid flow compared to the original PIC method.

See also: Zhu, Yongning, and Robert Bridson. "Animating sand as a fluid." ACM Transactions on Graphics (TOG). Vol. 24. No. 3. ACM, 2005.

Constructor & Destructor Documentation

◆ FLIPSolver2() [1/4]

CubbyFlow::FLIPSolver2::FLIPSolver2 ( )

Default constructor.

◆ FLIPSolver2() [2/4]

CubbyFlow::FLIPSolver2::FLIPSolver2	(	const Vector2UZ &	resolution,
		const Vector2D &	gridSpacing,
		const Vector2D &	gridOrigin
	)

Constructs solver with initial grid size.

◆ FLIPSolver2() [3/4]

CubbyFlow::FLIPSolver2::FLIPSolver2 ( const FLIPSolver2 & )

delete

Deleted copy constructor.

◆ FLIPSolver2() [4/4]

CubbyFlow::FLIPSolver2::FLIPSolver2 ( FLIPSolver2 && )

deletenoexcept

Deleted move constructor.

◆ ~FLIPSolver2()

CubbyFlow::FLIPSolver2::~FLIPSolver2 ( )

overridedefault

Default virtual destructor.

Member Function Documentation

◆ GetBuilder()

static Builder CubbyFlow::FLIPSolver2::GetBuilder ( )

static

Returns builder fox FLIPSolver2.

◆ GetPICBlendingFactor()

double CubbyFlow::FLIPSolver2::GetPICBlendingFactor ( ) const

Returns the PIC blending factor.

◆ operator=() [1/2]

FLIPSolver2& CubbyFlow::FLIPSolver2::operator= ( const FLIPSolver2 & )

delete

Deleted copy assignment operator.

◆ operator=() [2/2]

FLIPSolver2& CubbyFlow::FLIPSolver2::operator= ( FLIPSolver2 && )

deletenoexcept

Deleted move assignment operator.

◆ SetPICBlendingFactor()

void CubbyFlow::FLIPSolver2::SetPICBlendingFactor ( double factor )

Sets the PIC blending factor.

This function sets the PIC blending factor which mixes FLIP and PIC results when transferring velocity from grids to particles in order to reduce the noise. The factor can be a value between 0 and 1, where 0 means no blending and 1 means full PIC. Default is 0.

Parameters

[in] factor The blending factor.

◆ TransferFromGridsToParticles()

void CubbyFlow::FLIPSolver2::TransferFromGridsToParticles ( )

overrideprotectedvirtual

Transfers velocity field from grids to particles.

Reimplemented from CubbyFlow::PICSolver2.

◆ TransferFromParticlesToGrids()

void CubbyFlow::FLIPSolver2::TransferFromParticlesToGrids ( )