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Reference documentation for deal.II version 9.6.0
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#include <deal.II/particles/particle.h>
Public Member Functions | |
Particle () | |
Particle (const Point< spacedim > &location, const Point< dim > &reference_location, const types::particle_index id) | |
Particle (const Particle< dim, spacedim > &particle) | |
Particle (const void *&begin_data, PropertyPool< dim, spacedim > *const property_pool=nullptr) | |
Particle (Particle< dim, spacedim > &&particle) noexcept | |
Particle< dim, spacedim > & | operator= (const Particle< dim, spacedim > &particle) |
Particle< dim, spacedim > & | operator= (Particle< dim, spacedim > &&particle) noexcept |
~Particle () | |
void * | write_particle_data_to_memory (void *data) const |
const void * | read_particle_data_from_memory (const void *data) |
void | set_location (const Point< spacedim > &new_location) |
const Point< spacedim > & | get_location () const |
Point< spacedim > & | get_location () |
void | set_reference_location (const Point< dim > &new_reference_location) |
const Point< dim > & | get_reference_location () const |
types::particle_index | get_id () const |
void | set_id (const types::particle_index &new_id) |
void | set_property_pool (PropertyPool< dim, spacedim > &property_pool) |
bool | has_properties () const |
void | set_properties (const ArrayView< const double > &new_properties) |
ArrayView< double > | get_properties () |
ArrayView< const double > | get_properties () const |
std::size_t | serialized_size_in_bytes () const |
template<class Archive > | |
void | save (Archive &ar, const unsigned int version) const |
template<class Archive > | |
void | load (Archive &ar, const unsigned int version) |
void | free_properties () |
template<class Archive > | |
void | serialize (Archive &archive, const unsigned int version) |
Private Attributes | |
PropertyPool< dim, spacedim > * | property_pool |
PropertyPool< dim, spacedim >::Handle | property_pool_handle |
Static Private Attributes | |
static PropertyPool< dim, spacedim > | global_property_pool |
A class that represents a particle in a domain that is meshed by a triangulation of some kind. The data this class stores is the position of the particle in the overall space, the position of the particle in the reference coordinate system of the cell it is currently in, an ID number that is unique among all particles, and a variable number of "properties".
The "properties" attached to each object of this class are stored by a PropertyPool object. These properties are stored as an array of double
variables that can be accessed via an ArrayView object. For example, if one wanted to equip each particle with a "temperature" and "chemical composition" property that is advected along with the particle (and may change from time step to time step based on some differential equation, for example), then one would allocate two properties per particle in the PropertyPool object.
In practice, however, one often wants to associate properties with particles that are not just independent numbers as in the situation above. An example would be if one wanted to track the stress or strain that a particle is subjected to – a tensor-valued quantity. In these cases, one would interpret these scalar properties as the components of the stress or strain. In other words, one would first tell the PropertyPool to allocate as many properties per particle as there are components in the tensor one wants to track, and then write small conversion functions that take the ArrayView of scalar properties returned by the get_properties() function and convert it to a tensor of the appropriate type. This can then be evaluated and evolved in each time step. A second conversion function would convert back from a tensor to an ArrayView object to store the updated data back in the particle via the set_properties() function.
There are of course cases where the properties one cares about are not real (or, in computers, floating point) numbers but rather categorical: For example, one may want to mark some particles as "red", "blue", or "green". The property might then either be represented as an integer, or as an element of an enum
. In these cases, one would need to come up with a way to represent these sorts of categorical fields in terms of floating point numbers. For example, one could map "red" to the floating point number 1.0, "blue" to 2.0, and "green" to 3.0. The conversion functions to translate between these two representations should then not be very difficult to write either.
Definition at line 93 of file particle.h.
Particles::Particle< dim, spacedim >::Particle | ( | ) |
Empty constructor for Particle, creates a particle at the origin.
Definition at line 29 of file particle.cc.
Particles::Particle< dim, spacedim >::Particle | ( | const Point< spacedim > & | location, |
const Point< dim > & | reference_location, | ||
const types::particle_index | id ) |
Constructor for Particle. This function creates a particle with the specified ID at the specified location. Note that there is no check for duplicate particle IDs so the user must make sure the IDs are unique over all processes. Data is stored in a global PropertyPool object (corresponding to the global "heap") but can later be transferred to another property pool by calling set_property_pool().
[in] | location | Initial location of particle. |
[in] | reference_location | Initial location of the particle in the coordinate system of the reference cell. |
[in] | id | Globally unique ID number of particle. |
Definition at line 37 of file particle.cc.
Particles::Particle< dim, spacedim >::Particle | ( | const Particle< dim, spacedim > & | particle | ) |
Copy-constructor for Particle. This function creates a particle with exactly the state of the input argument. The copied data is stored in a global PropertyPool object (corresponding to the global "heap") but can later be transferred to another property pool by calling set_property_pool().
Definition at line 51 of file particle.cc.
Particles::Particle< dim, spacedim >::Particle | ( | const void *& | begin_data, |
PropertyPool< dim, spacedim > *const | property_pool = nullptr ) |
Constructor for Particle. This function creates a particle from a data vector. Data is stored in a global PropertyPool object (corresponding to the global "heap") but can later be transferred to another property pool by calling set_property_pool(). This constructor is usually called after serializing a particle by calling the write_data() function.
[in,out] | begin_data | A pointer to a memory location from which to read the information that completely describes a particle. This class then de-serializes its data from this memory location and advances the pointer beyond the data that has been read to initialize the particle information. |
[in,out] | property_pool | An optional pointer to a property pool that is used to manage the property data used by this particle. If this argument is not provided, then a global property pool is used; on the other hand, if a non-null pointer is provided, this constructor assumes begin_data contains serialized data of the same length and type that is allocated by property_pool . If the data pointer provided here corresponds to data for a particle that has properties, then this function will only succeed if a property pool is provided as second argument that is able to store the correct number of properties per particle. |
Definition at line 75 of file particle.cc.
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noexcept |
Move constructor for Particle, creates a particle from an existing one by stealing its state.
Definition at line 112 of file particle.cc.
Particles::Particle< dim, spacedim >::~Particle | ( | ) |
Destructor. Releases the property handle if it is valid, and therefore frees that memory space for other particles. (Note: the memory is managed by the property pool, and the pool is responsible for what happens to the memory.
Definition at line 190 of file particle.cc.
Particle< dim, spacedim > & Particles::Particle< dim, spacedim >::operator= | ( | const Particle< dim, spacedim > & | particle | ) |
Copy assignment operator.
Definition at line 129 of file particle.cc.
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noexcept |
Move assignment operator.
Definition at line 161 of file particle.cc.
void * Particles::Particle< dim, spacedim >::write_particle_data_to_memory | ( | void * | data | ) | const |
Write particle data into a data array. The array is expected to be large enough to take the data, and the void pointer should point to the first entry of the array to which the data should be written. This function is meant for serializing all particle properties and later de-serializing the properties by calling the appropriate constructor Particle(void *&data, PropertyPool *property_pool = nullptr);
[in] | data | The memory location to write particle data into. |
Definition at line 218 of file particle.cc.
const void * Particles::Particle< dim, spacedim >::read_particle_data_from_memory | ( | const void * | data | ) |
Update all of the data associated with a particle: id, location, reference location and, if any, properties by using a data array. The array is expected to be large enough to take the data, and the void pointer should point to the first entry of the array to which the data should be written. This function is meant for de-serializing the particle data without requiring that a new Particle class be built. This is used in the ParticleHandler to update the ghost particles without de-allocating and re-allocating memory.
[in] | data | A pointer to a memory location from which to read the information that completely describes a particle. This class then de-serializes its data from this memory location. |
Definition at line 251 of file particle.cc.
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inline |
Set the location of this particle. Note that this does not check whether this is a valid location in the simulation domain.
[in] | new_location | The new location for this particle. |
const
objects that shouldn't be modified even if the objects allow for calls that modify properties. Rather, properties should only be modified on processors that actually own the particle. Definition at line 545 of file particle.h.
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inline |
Get the location of this particle.
Definition at line 554 of file particle.h.
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inline |
Get read- and write-access to the location of this particle. Note that changing the location does not check whether this is a valid location in the simulation domain.
const
objects that shouldn't be modified even if the objects allow for calls that modify properties. Rather, properties should only be modified on processors that actually own the particle.Definition at line 563 of file particle.h.
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inline |
Set the reference location of this particle.
[in] | new_reference_location | The new reference location for this particle. |
const
objects that shouldn't be modified even if the objects allow for calls that modify properties. Rather, properties should only be modified on processors that actually own the particle. Definition at line 572 of file particle.h.
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inline |
Return the reference location of this particle in its current cell.
Definition at line 581 of file particle.h.
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inline |
Return the ID number of this particle. The ID of a particle is intended to be a property that is globally unique even in parallel computations and is transferred along with other properties of a particle if it moves from a cell owned by the current processor to a cell owned by a different processor, or if ownership of the cell it is on is transferred to a different processor.
Definition at line 590 of file particle.h.
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inline |
Set the ID number of this particle. The ID of a particle is intended to be a property that is globally unique even in parallel computations and is transferred along with other properties of a particle if it moves from a cell owned by the current processor to a cell owned by a different processor, or if ownership of the cell it is on is transferred to a different processor. As a consequence, when setting the ID of a particle, care needs to be taken to ensure that particles have globally unique IDs. (The ParticleHandler does not itself check whether particle IDs so set are globally unique in a parallel setting since this would be a very expensive operation.)
[in] | new_id | The new ID number for this particle. |
const
objects that shouldn't be modified even if the objects allow for calls that modify properties. Rather, properties should only be modified on processors that actually own the particle. Definition at line 599 of file particle.h.
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inline |
Tell the particle where to store its properties (even if it does not own properties). Usually this is only done once per particle, but since the particle does not know about the properties, we want to do it not at construction time. Another use for this function is after particle transfer to a new process.
If a particle already stores properties in a property pool, then their values are saved, the memory is released in the previous property pool, and a copy of the particle's properties will be allocated in the new property pool.
Definition at line 608 of file particle.h.
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inline |
Return whether this particle has a valid property pool and a valid handle to properties.
Definition at line 670 of file particle.h.
void Particles::Particle< dim, spacedim >::set_properties | ( | const ArrayView< const double > & | new_properties | ) |
Set the properties of this particle.
[in] | new_properties | An ArrayView containing the new properties for this particle. |
const
objects that shouldn't be modified even if the objects allow for calls that modify properties. Rather, properties should only be modified on processors that actually own the particle. Definition at line 305 of file particle.cc.
ArrayView< double > Particles::Particle< dim, spacedim >::get_properties | ( | ) |
Get write-access to properties of this particle. If the particle has no properties yet, but has access to a PropertyPool object it will allocate properties to allow writing into them. If it has no properties and has no access to a PropertyPool this function will throw an exception.
Definition at line 330 of file particle.cc.
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inline |
Get read-access to properties of this particle. If the particle has no properties this function throws an exception.
Definition at line 658 of file particle.h.
std::size_t Particles::Particle< dim, spacedim >::serialized_size_in_bytes | ( | ) | const |
Return the size in bytes this particle occupies if all of its data is serialized (i.e. the number of bytes that is written by the write_data function of this class).
Definition at line 286 of file particle.cc.
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inline |
Write the data of this object to a stream for the purpose of serialization using the BOOST serialization library.
Definition at line 523 of file particle.h.
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inline |
Read the data of this object from a stream for the purpose of serialization using the BOOST serialization library. Note that in order to store the properties correctly, the property pool of this particle has to be known at the time of reading, i.e. set_property_pool() has to have been called, before this function is called.
Definition at line 489 of file particle.h.
void Particles::Particle< dim, spacedim >::free_properties | ( | ) |
Free the memory of the property pool
Definition at line 203 of file particle.cc.
void Particles::Particle< dim, spacedim >::serialize | ( | Archive & | archive, |
const unsigned int | version ) |
Write and read the data of this object from a stream for the purpose of serialization using the BOOST serialization library.
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staticprivate |
A global property pool used when a particle is not associated with a property pool that belongs to, for example, a ParticleHandler.
Definition at line 468 of file particle.h.
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private |
A pointer to the property pool. Necessary to translate from the handle to the actual memory locations.
Definition at line 474 of file particle.h.
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private |
A handle to all particle properties
Definition at line 479 of file particle.h.