Abstract base class for grid-based 2-D fluid solver. More...

#include <jet/grid_fluid_solver2.h>

Inheritance diagram for jet::GridFluidSolver2:

Classes
class	Builder
	Front-end to create GridFluidSolver2 objects step by step. More...

Public Member Functions
	GridFluidSolver2 ()
	Default constructor. More...

	GridFluidSolver2 (const Size2 &resolution, const Vector2D &gridSpacing, const Vector2D &gridOrigin)
	Constructs solver with initial grid size. More...

virtual	~GridFluidSolver2 ()
	Default destructor. More...

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

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

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

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

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

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

void	setMaxCfl (double newCfl)
	Sets the max allowed CFL number. More...

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

void	setUseCompressedLinearSystem (bool onoff)
	Sets whether the solver should use compressed linear system. More...

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

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

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

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

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

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

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

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

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

void	resizeGrid (const Size2 &newSize, const Vector2D &newGridSpacing, const Vector2D &newGridOrigin)
	Resizes grid system data. More...

Size2	resolution () const
	Returns the resolution of the grid system data. More...

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

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

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

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

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

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

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

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

virtual	~PhysicsAnimation ()
	Destructor. More...

bool	isUsingFixedSubTimeSteps () 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	numberOfFixedSubTimeSteps () 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	currentFrame () const
	Returns current frame. More...

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

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

Public Member Functions inherited from jet::Animation
	Animation ()

virtual	~Animation ()

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

Static Public Member Functions
static Builder	builder ()
	Returns builder fox GridFluidSolver2. More...

Protected Member Functions
void	onInitialize () override
	Called when it needs to setup initial condition. More...

void	onAdvanceTimeStep (double timeIntervalInSeconds) override
	Called when advancing a single time-step. More...

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

virtual void	onBeginAdvanceTimeStep (double timeIntervalInSeconds)
	Called at the beginning of a time-step. 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...

virtual void	computeAdvection (double timeIntervalInSeconds)
	Computes the advection term using the advection solver. More...

virtual ScalarField2Ptr	fluidSdf () const

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

void	applyBoundaryCondition ()
	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	colliderSdf () const
	Returns the signed-distance field representation of the collider. More...

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

Detailed Description

Abstract base class for grid-based 2-D fluid solver.

This is an abstract base class for grid-based 2-D fluid solver based on Jos Stam's famous 1999 paper - "Stable Fluids". This solver takes fractional step method as its foundation which is consisted of independent advection, diffusion, external forces, and pressure projection steps. Each step is configurable so that a custom step can be implemented. For example, if a user wants to change the advection solver to her/his own implementation, simply call GridFluidSolver2::setAdvectionSolver(newSolver).

Constructor & Destructor Documentation

◆ GridFluidSolver2() [1/2]

jet::GridFluidSolver2::GridFluidSolver2 ( )

Default constructor.

◆ GridFluidSolver2() [2/2]

jet::GridFluidSolver2::GridFluidSolver2	(	const Size2 &	resolution,
		const Vector2D &	gridSpacing,
		const Vector2D &	gridOrigin
	)

Constructs solver with initial grid size.

◆ ~GridFluidSolver2()

virtual jet::GridFluidSolver2::~GridFluidSolver2 ( )

virtual

Default destructor.

Member Function Documentation

◆ advectionSolver()

const AdvectionSolver2Ptr& jet::GridFluidSolver2::advectionSolver ( ) const

Returns the advection solver instance.

◆ applyBoundaryCondition()

void jet::GridFluidSolver2::applyBoundaryCondition ( )

protected

Applies the boundary condition to the velocity field.

This function applies the boundary condition to the velocity field by constraining the flow based on the boundary condition solver.

◆ builder()

static Builder jet::GridFluidSolver2::builder ( )

static

Returns builder fox GridFluidSolver2.

◆ cfl()

double jet::GridFluidSolver2::cfl ( double timeIntervalInSeconds ) const

Returns the CFL number from the current velocity field for given time interval.

Parameters

[in] timeIntervalInSeconds The time interval in seconds.

◆ closedDomainBoundaryFlag()

int jet::GridFluidSolver2::closedDomainBoundaryFlag ( ) const

Returns the closed domain boundary flag.

◆ collider()

const Collider2Ptr& jet::GridFluidSolver2::collider ( ) const

Returns the collider.

◆ colliderSdf()

ScalarField2Ptr jet::GridFluidSolver2::colliderSdf ( ) const

protected

Returns the signed-distance field representation of the collider.

◆ colliderVelocityField()

VectorField2Ptr jet::GridFluidSolver2::colliderVelocityField ( ) const

protected

Returns the velocity field of the collider.

◆ computeAdvection()

virtual void jet::GridFluidSolver2::computeAdvection ( double timeIntervalInSeconds )

protectedvirtual

Computes the advection term using the advection solver.

Reimplemented in jet::LevelSetLiquidSolver2, and jet::PicSolver2.

◆ computeExternalForces()

virtual void jet::GridFluidSolver2::computeExternalForces ( double timeIntervalInSeconds )

protectedvirtual

Computes the external force terms.

This function computes the external force applied for given time interval. By default, it only computes the gravity.

See also: GridFluidSolver2::computeGravity

Reimplemented in jet::GridSmokeSolver2.

◆ computeGravity()

void jet::GridFluidSolver2::computeGravity ( double timeIntervalInSeconds )

protected

Computes the gravity term.

◆ computePressure()

virtual void jet::GridFluidSolver2::computePressure ( double timeIntervalInSeconds )

protectedvirtual

Computes the pressure term using the pressure solver.

◆ computeViscosity()

virtual void jet::GridFluidSolver2::computeViscosity ( double timeIntervalInSeconds )

protectedvirtual

Computes the viscosity term using the diffusion solver.

◆ diffusionSolver()

const GridDiffusionSolver2Ptr& jet::GridFluidSolver2::diffusionSolver ( ) const

Returns the diffusion solver instance.

◆ emitter()

const GridEmitter2Ptr& jet::GridFluidSolver2::emitter ( ) const

Returns the emitter.

◆ extrapolateIntoCollider() [1/3]

void jet::GridFluidSolver2::extrapolateIntoCollider ( CollocatedVectorGrid2 * grid )

protected

Extrapolates given field into the collider-occupied region.

◆ extrapolateIntoCollider() [2/3]

void jet::GridFluidSolver2::extrapolateIntoCollider ( FaceCenteredGrid2 * grid )

protected

Extrapolates given field into the collider-occupied region.

◆ extrapolateIntoCollider() [3/3]

void jet::GridFluidSolver2::extrapolateIntoCollider ( ScalarGrid2 * grid )

protected

Extrapolates given field into the collider-occupied region.

◆ fluidSdf()

virtual ScalarField2Ptr jet::GridFluidSolver2::fluidSdf ( ) const

protectedvirtual

\breif Returns the signed-distance representation of the fluid.

This function returns the signed-distance representation of the fluid. Positive sign area is considered to be atmosphere and won't be included for computing the dynamics. By default, this will return constant scalar field of -kMaxD, meaning that the entire volume is occupied with fluid.

Reimplemented in jet::LevelSetLiquidSolver2, and jet::PicSolver2.

◆ gravity()

const Vector2D& jet::GridFluidSolver2::gravity ( ) const

Returns the gravity vector of the system.

◆ gridOrigin()

Vector2D jet::GridFluidSolver2::gridOrigin ( ) const

Returns the origin of the grid system data.

This function returns the resolution of the grid system data. This is equivalent to calling gridSystemData()->origin(), but provides a shortcut.

◆ gridSpacing()

Vector2D jet::GridFluidSolver2::gridSpacing ( ) const

Returns the grid spacing of the grid system data.

This function returns the resolution of the grid system data. This is equivalent to calling gridSystemData()->gridSpacing(), but provides a shortcut.

◆ gridSystemData()

const GridSystemData2Ptr& jet::GridFluidSolver2::gridSystemData ( ) const

Returns the grid system data.

This function returns the grid system data. The grid system data stores the core fluid flow fields such as velocity. By default, the data instance has velocity field only.

See also: GridSystemData2

◆ maxCfl()

double jet::GridFluidSolver2::maxCfl ( ) const

Returns the max allowed CFL number.

◆ numberOfSubTimeSteps()

unsigned int jet::GridFluidSolver2::numberOfSubTimeSteps ( double timeIntervalInSeconds ) const

overrideprotectedvirtual

Returns the required sub-time-steps for given time interval.

This function returns the required sub-time-steps for given time interval based on the max allowed CFL number. If the time interval is too large so that it makes the CFL number greater than the max value, This function will return a numebr that is greater than 1.

See also: GridFluidSolver2::maxCfl

Reimplemented from jet::PhysicsAnimation.

◆ onAdvanceTimeStep()

void jet::GridFluidSolver2::onAdvanceTimeStep ( double timeIntervalInSeconds )

overrideprotectedvirtual

Called when advancing a single time-step.

Implements jet::PhysicsAnimation.

◆ onBeginAdvanceTimeStep()

virtual void jet::GridFluidSolver2::onBeginAdvanceTimeStep ( double timeIntervalInSeconds )

protectedvirtual

Called at the beginning of a time-step.

Reimplemented in jet::LevelSetLiquidSolver2, and jet::PicSolver2.

◆ onEndAdvanceTimeStep()

virtual void jet::GridFluidSolver2::onEndAdvanceTimeStep ( double timeIntervalInSeconds )

protectedvirtual

Called at the end of a time-step.

Reimplemented in jet::GridSmokeSolver2, and jet::LevelSetLiquidSolver2.

◆ onInitialize()

void jet::GridFluidSolver2::onInitialize ( )

overrideprotectedvirtual

Called when it needs to setup initial condition.

Reimplemented from jet::PhysicsAnimation.

Reimplemented in jet::PicSolver2.

◆ pressureSolver()

const GridPressureSolver2Ptr& jet::GridFluidSolver2::pressureSolver ( ) const

Returns the pressure solver instance.

◆ resizeGrid()

void jet::GridFluidSolver2::resizeGrid	(	const Size2 &	newSize,
		const Vector2D &	newGridSpacing,
		const Vector2D &	newGridOrigin
	)

Resizes grid system data.

This function resizes grid system data. You can also resize the grid by calling resize function directly from GridFluidSolver2::gridSystemData(), but this function provides a shortcut for the same operation.

Parameters

[in]	newSize	The new size.
[in]	newGridSpacing	The new grid spacing.
[in]	newGridOrigin	The new grid origin.

◆ resolution()

Size2 jet::GridFluidSolver2::resolution ( ) const

Returns the resolution of the grid system data.

This function returns the resolution of the grid system data. This is equivalent to calling gridSystemData()->resolution(), but provides a shortcut.

◆ setAdvectionSolver()

void jet::GridFluidSolver2::setAdvectionSolver ( const AdvectionSolver2Ptr & newSolver )

Sets the advection solver.

◆ setClosedDomainBoundaryFlag()

void jet::GridFluidSolver2::setClosedDomainBoundaryFlag ( int flag )

Sets the closed domain boundary flag.

◆ setCollider()

void jet::GridFluidSolver2::setCollider ( const Collider2Ptr & newCollider )

Sets the collider.

◆ setDiffusionSolver()

void jet::GridFluidSolver2::setDiffusionSolver ( const GridDiffusionSolver2Ptr & newSolver )

Sets the diffusion solver.

◆ setEmitter()

void jet::GridFluidSolver2::setEmitter ( const GridEmitter2Ptr & newEmitter )

Sets the emitter.

◆ setGravity()

void jet::GridFluidSolver2::setGravity ( const Vector2D & newGravity )

Sets the gravity of the system.

◆ setMaxCfl()

void jet::GridFluidSolver2::setMaxCfl ( double newCfl )

Sets the max allowed CFL number.

◆ setPressureSolver()

void jet::GridFluidSolver2::setPressureSolver ( const GridPressureSolver2Ptr & newSolver )

Sets the pressure solver.

◆ setUseCompressedLinearSystem()

void jet::GridFluidSolver2::setUseCompressedLinearSystem ( bool onoff )

Sets whether the solver should use compressed linear system.

◆ setViscosityCoefficient()

void jet::GridFluidSolver2::setViscosityCoefficient ( double newValue )

Sets the viscosity coefficient.

This function sets the viscosity coefficient. Non-positive input will be clamped to zero.

Parameters

[in] newValue The new viscosity coefficient value.

◆ useCompressedLinearSystem()

bool jet::GridFluidSolver2::useCompressedLinearSystem ( ) const

Returns true if the solver is using compressed linear system.

◆ velocity()

const FaceCenteredGrid2Ptr& jet::GridFluidSolver2::velocity ( ) const

Returns the velocity field.

This function returns the velocity field from the grid system data. It is just a shortcut to the most commonly accessed data chunk.

◆ viscosityCoefficient()

double jet::GridFluidSolver2::viscosityCoefficient ( ) const

Returns the viscosity coefficient.

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

jet/grid_fluid_solver2.h

Classes

Public Member Functions

Static Public Member Functions

Protected Member Functions

Detailed Description

Constructor & Destructor Documentation

◆ GridFluidSolver2() [1/2]

◆ GridFluidSolver2() [2/2]

◆ ~GridFluidSolver2()

Member Function Documentation

◆ advectionSolver()

◆ applyBoundaryCondition()

◆ builder()

◆ cfl()

◆ closedDomainBoundaryFlag()

◆ collider()

◆ colliderSdf()

◆ colliderVelocityField()

◆ computeAdvection()

◆ computeExternalForces()

◆ computeGravity()

◆ computePressure()

◆ computeViscosity()

◆ diffusionSolver()

◆ emitter()

◆ extrapolateIntoCollider() [1/3]

◆ extrapolateIntoCollider() [2/3]

◆ extrapolateIntoCollider() [3/3]

◆ fluidSdf()

◆ gravity()

◆ gridOrigin()

◆ gridSpacing()

◆ gridSystemData()

◆ maxCfl()

◆ numberOfSubTimeSteps()

◆ onAdvanceTimeStep()

◆ onBeginAdvanceTimeStep()

◆ onEndAdvanceTimeStep()

◆ onInitialize()

◆ pressureSolver()

◆ resizeGrid()

◆ resolution()

◆ setAdvectionSolver()

◆ setClosedDomainBoundaryFlag()

◆ setCollider()

◆ setDiffusionSolver()

◆ setEmitter()

◆ setGravity()

◆ setMaxCfl()

◆ setPressureSolver()

◆ setUseCompressedLinearSystem()

◆ setViscosityCoefficient()

◆ useCompressedLinearSystem()

◆ velocity()

◆ viscosityCoefficient()