A class used to model a membrane wall in a DEM simulation. More...

#include <membrane_wall.hpp>

Inheritance diagram for netdem::MembraneWall:

Public Member Functions
	MembraneWall ()
	Default constructor for MembraneWall class.

	MembraneWall (double radius, double height)
	Constructor for MembraneWall class with specified radius and height.

	MembraneWall (double radius, double height, double mesh_size)
	Constructor for MembraneWall class with specified radius, height, and mesh size.

	MembraneWall (double radius, double height, double mesh_size, double center_x, double center_y, double center_z)
	Constructor for MembraneWall class with specified radius, height, mesh size, and center coordinates.

void	SetRootPath (std::string const &root_path)
	Sets the root path for saving membrane wall data.

void	SetDataType (std::string const &data_type)
	Sets the data type for saving membrane wall data.

void	SetSaveByTime (double interval)
	Sets the time interval for saving membrane wall data.

void	SetSaveByCycles (double interval)
	Sets the cycle interval for saving membrane wall data.

void	SetDimensions (double r, double h)
	Sets the radius and height of the membrane wall.

Modifier *	Clone () const override
	Clones the current MembraneWall instance.

void	Init (Simulation *sim) override
	Initializes the MembraneWall instance.

void	SetPressure (double pressure)
	Sets the pressure applied to the membrane wall.

void	Execute () override
	Executes the MembraneWall instance.

Public Member Functions inherited from netdem::Modifier
	Modifier ()
	Default constructor for Modifier class.

virtual void	Enable ()
	Enables the Modifier instance.

virtual void	Disable ()
	Disables the Modifier instance.

virtual void	Update ()
	Updates the Modifier instance.

virtual	~Modifier ()
	Destructor for Modifier class.

Public Member Functions inherited from netdem::Membrane
	Membrane (double radius, double height)
	Constructs a new `Membrane` object with the given radius and height.

	Membrane (double radius, double height, double mesh_size)
	Constructs a new `Membrane` object with the given radius, height, and element size.

	Membrane (double radius, double height, double mesh_size, double center_x, double center_y, double center_z)
	Constructs a new `Membrane` object with the given radius, height, element size, and center.

void	Remesh (double ele_size)
	Remeshes the membrane.

void	Init ()
	Initializes the membrane.

void	SetBCNodalVelocity (int nid, double vx, double vy, double vz, bool use_prescribed_vx, bool use_prescribed_vy, bool use_prescribed_vz)
	Sets the nodal velocity and boundary condition for a given node.

void	Solve (double dt)
	Solves the membrane motion for a given timestep.

void	SaveAsVTK (std::string const &file_name)
	Saves the current state of the membrane as a VTK file.

	~Membrane ()
	Destroys the `Membrane` object.

Public Attributes
bool	enable_deformation {false}

bool	dump_info {true}

bool	facing_outside {true}

VecXT< Wall * >	wall_list

Public Attributes inherited from netdem::Modifier
std::string	label {"default"}

DEMSolver::CyclePoint	cycle_point {DEMSolver::CyclePoint::pre}

Simulation *	sim {nullptr}

Scene *	scene {nullptr}

bool	update_with_scene {false}

bool	enable_logging {true}

Public Attributes inherited from netdem::Membrane
double	radius {0.25}
	The radius of the membrane.

double	height {1.0}
	The height of the membrane.

double	mesh_size {0.1}
	The size of the elements in the mesh used to represent the membrane.

Vec3d	center {0, 0, 0}
	The center of the membrane.

double	neo_k {6.94e5}
	Material properties of the membrane (neo-Hookean material model).

double	neo_mu {5.21e5}
	Material properties of the membrane (neo-Hookean material model).

double	density {500.0}
	Material properties of the membrane.

double	thickness {0.3e-3}
	Material properties of the membrane.

double	damp_coef {0.7}
	Damping coefficient for the membrane motion.

double	timestep {1.0e-4}
	Timestep for the simulation.

VecXT< Vec3d >	nodes
	Triangle mesh representing the membrane: nodes.

VecXT< Vec3i >	elements
	Triangle mesh representing the membrane: elements.

VecXT< Vec3d >	elemental_stress
	Elemental stress tensor for each element in the mesh.

VecXT< double >	nodal_vols
	Nodal volumes for each node in the mesh (used for updating motion using a lumped mass approach).

VecXT< Vec3d >	nodal_vels
	Nodal velocities for each node in the mesh (used for updating motion using a lumped mass approach).

VecXT< double >	bc_facet_pressure
	Facet pressures for the boundary conditions.

VecXT< Vec3d >	bc_facet_forces
	Facet forces for the boundary conditions.

VecXT< VecNT< double, 6 > >	bc_nodal_vels
	Nodal velocities for the boundary conditions. The last three elements indicate if prescribed velocities are used.

Additional Inherited Members
Protected Member Functions inherited from netdem::Membrane
void	Advance (double dt)
	Advances the membrane motion for a given timestep.

void	InitMesh ()
	Initializes the mesh used to represent the membrane.

void	InitInitialCondition ()
	Initializes the initial conditions for the simulation.

Mat2d	GetDeformationGradient (Vec3d const &v0, Vec3d const &v1, Vec3d const &v2)
	Calculates the deformation gradient tensor for an element.

Mat2d	GetCauchyStress (Mat2d const &def_grad)
	Calculates the Cauchy stress tensor for an element.

std::tuple< Mat3d, Mat3d >	GetGlobalForces (Mat2d const &cauchy_stress, double pressure, Vec3d const &v0, Vec3d const &v1, Vec3d const &v2)
	Calculates the global internal and external forces acting on an element.

Protected Attributes inherited from netdem::Membrane
double	ref_ele_width {0.1}
	Reference width and height of each element.

double	ref_ele_height {0.1}

double	ref_ele_area {0.05}
	Reference area of each element.

VecXT< Vec3d >	nodal_forces_int
	Nodal internal forces.

VecXT< Vec3d >	nodal_forces_ext
	Nodal external forces.

Detailed Description

A class used to model a membrane wall in a DEM simulation.

This class inherits from both the Modifier and Membrane classes.

Examples: 1_membrane_case.cpp.

Constructor & Destructor Documentation

◆ MembraneWall() [1/4]

MembraneWall::MembraneWall ( )

Default constructor for MembraneWall class.

◆ MembraneWall() [2/4]

MembraneWall::MembraneWall	(	double	radius,
		double	height )

Constructor for MembraneWall class with specified radius and height.

Parameters

radius	The radius of the membrane wall.
height	The height of the membrane wall.

◆ MembraneWall() [3/4]

MembraneWall::MembraneWall	(	double	radius,
		double	height,
		double	mesh_size )

Constructor for MembraneWall class with specified radius, height, and mesh size.

Parameters

radius	The radius of the membrane wall.
height	The height of the membrane wall.
mesh_size	The size of the mesh used to represent the wall.

◆ MembraneWall() [4/4]

MembraneWall::MembraneWall	(	double	radius,
		double	height,
		double	mesh_size,
		double	center_x,
		double	center_y,
		double	center_z )

Constructor for MembraneWall class with specified radius, height, mesh size, and center coordinates.

Parameters

radius	The radius of the membrane wall.
height	The height of the membrane wall.
mesh_size	The size of the mesh used to represent the wall.
center_x	The x-coordinate of the center of the wall.
center_y	The y-coordinate of the center of the wall.
center_z	The z-coordinate of the center of the wall.

Member Function Documentation

◆ Clone()

Modifier * MembraneWall::Clone ( ) const

overridevirtual

Clones the current MembraneWall instance.

Returns: A pointer to the cloned MembraneWall instance.

Reimplemented from netdem::Modifier.

◆ Execute()

void MembraneWall::Execute ( )

overridevirtual

Executes the MembraneWall instance.

Positions of particles are constrained to be within the membrane wall.

Reimplemented from netdem::Modifier.

◆ Init()

void MembraneWall::Init ( Simulation * sim )

overridevirtual

Initializes the MembraneWall instance.

Parameters

sim	Pointer to the current simulation object.

Reimplemented from netdem::Modifier.

◆ SetDataType()

void MembraneWall::SetDataType ( std::string const & data_type )

Sets the data type for saving membrane wall data.

Parameters

data_type The data type to save as (e.g. "vtk").

◆ SetDimensions()

void MembraneWall::SetDimensions	(	double	r,
		double	h )

Sets the radius and height of the membrane wall.

Parameters

r	The new radius of the wall.
h	The new height of the wall.

◆ SetPressure()

void MembraneWall::SetPressure ( double pressure )

Sets the pressure applied to the membrane wall.

Parameters

pressure The pressure to apply to the wall.

◆ SetRootPath()

void MembraneWall::SetRootPath ( std::string const & root_path )

Sets the root path for saving membrane wall data.

Parameters

root_path The root path to save data to.

◆ SetSaveByCycles()

void MembraneWall::SetSaveByCycles ( double interval )

Sets the cycle interval for saving membrane wall data.

Parameters

interval The cycle interval between saves.

◆ SetSaveByTime()

void MembraneWall::SetSaveByTime ( double interval )

Sets the time interval for saving membrane wall data.

Parameters

interval The time interval between saves.

Member Data Documentation

◆ dump_info

bool netdem::MembraneWall::dump_info {true}

◆ enable_deformation

bool netdem::MembraneWall::enable_deformation {false}

◆ facing_outside

bool netdem::MembraneWall::facing_outside {true}

◆ wall_list

VecXT<Wall *> netdem::MembraneWall::wall_list

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

/Users/lzhshou/Documents/Research/myProjects/apaam/repo/netdem/src/modifier/membrane_wall.hpp
/Users/lzhshou/Documents/Research/myProjects/apaam/repo/netdem/src/modifier/membrane_wall.cpp

Public Member Functions

Public Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ MembraneWall() [1/4]

◆ MembraneWall() [2/4]

◆ MembraneWall() [3/4]

◆ MembraneWall() [4/4]

Member Function Documentation

◆ Clone()

◆ Execute()

◆ Init()

◆ SetDataType()

◆ SetDimensions()

◆ SetPressure()

◆ SetRootPath()

◆ SetSaveByCycles()

◆ SetSaveByTime()

Member Data Documentation

◆ dump_info

◆ enable_deformation

◆ facing_outside

◆ wall_list