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contact_detector.hh
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/**
* @file contact_detection.hh
*
* @author Mohit Pundir <mohit.pundir@epfl.ch>
*
* @date creation: Wed Sep 12 2018
* @date last modification: Tue Oct 23 2018
*
* @brief Mother class for all detection algorithms
*
* @section LICENSE
*
* Copyright (©) 2010-2018 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* Akantu is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free
* Software Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* Akantu is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
* A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
* details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Akantu. If not, see <http://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#include "aka_bbox.hh"
#include "aka_common.hh"
#include "aka_grid_dynamic.hh"
#include "aka_memory.hh"
#include "contact_element.hh"
#include "element_class.hh"
#include "element_group.hh"
#include "fe_engine.hh"
#include "mesh.hh"
#include "mesh_io.hh"
#include "parsable.hh"
#include "surface_selector.hh"
#include "geometry_utils.hh"
/* -------------------------------------------------------------------------- */
#ifndef __AKANTU_CONTACT_DETECTOR_HH__
#define __AKANTU_CONTACT_DETECTOR_HH__
namespace akantu {
enum class Surface { master, slave };
/* -------------------------------------------------------------------------- */
class ContactDetector : private Memory, public Parsable {
/* ------------------------------------------------------------------------ */
/* Constructor/Destructors */
/* ------------------------------------------------------------------------ */
public:
ContactDetector(Mesh &, const ID & id = "contact_detector",
const MemoryID & memory_id = 0);
ContactDetector(Mesh &, Array<Real> positions,
const ID & id = "contact_detector",
const MemoryID & memory_id = 0);
~ContactDetector() = default;
/* ------------------------------------------------------------------------ */
/* Members */
/* ------------------------------------------------------------------------ */
public:
/// performs all search steps
void search(Array<ContactElement> & contact_map,
Array<Real> & gaps, Array<Real> & normals,
Array<Real> & projections);
/// performs global spatial search to construct spatial grids
void globalSearch(SpatialGrid<UInt> &, SpatialGrid<UInt> &);
/// performs local search to find closet master node to a slave node
void localSearch(SpatialGrid<UInt> &, SpatialGrid<UInt> &);
/// create contact elements
void createContactElements(Array<ContactElement> & elements,
Array<Real> & gaps, Array<Real> & normals,
Array<Real> & projections);
private:
/// reads the input file to get contact detection options
void parseSection();
/// computes the orthogonal projection on master elements
UInt computeOrthogonalProjection(const UInt &, const Array<Element> &,
Array<Real> &, Array<Real> &, Array<Real> &);
/// computes tangents on a given natural coordinate
void computeTangentsOnElement(const Element &, Vector<Real> &,
Matrix<Real> &);
/// computes tangents on a given natural coordinate
void computeTangentsOnElement(const Element &, Vector<Real> &,
Vector<Real> &, Matrix<Real> &);
/// computes projection of a query point on an element
void computeProjectionOnElement(const Element &, const Vector<Real> &,
const Vector<Real> &, Vector<Real> &,
Vector<Real> &);
/// computes natural projection of a real projection
void computeNaturalProjection(const Element &, Vector<Real> &,
Vector<Real> &);
/* ------------------------------------------------------------------------ */
/* Inline Methods */
/* ------------------------------------------------------------------------ */
public:
/// checks whether the natural projection is valid or not
inline bool checkValidityOfProjection(Vector<Real> &);
/// extracts the coordinates of an element
inline void coordinatesOfElement(const Element &, Matrix<Real> &);
/// computes the optimal cell size for grid
inline void computeCellSpacing(Vector<Real> &);
/// constructs a grid containing nodes lying within bounding box
inline void constructGrid(SpatialGrid<UInt> &, BBox &, const Array<UInt> &);
/// constructs the bounding box based on nodes list
inline void constructBoundingBox(BBox &, const Array<UInt> &);
/// computes the maximum in radius for a given mesh
inline void computeMaximalDetectionDistance();
/// constructs the connectivity for a contact element
inline Vector<UInt> constructConnectivity(UInt &, const Element &);
/// computes normal on an element
inline void computeNormalOnElement(const Element &, Vector<Real> &);
/// extracts vectors which forms the plane of element
inline void vectorsAlongElement(const Element &, Matrix<Real> &);
/// computes the gap between slave and its projection on master
/// surface
inline Real computeGap(Vector<Real> &, Vector<Real> &);
/// filter boundary elements
inline void filterBoundaryElements(Array<Element> & elements,
Array<Element> & boundary_elements);
/// checks whether self contact condition leads to a master element
/// which is closet but not orthogonally opposite to slave surface
inline bool checkValidityOfSelfContact(const UInt &, ContactElement &);
/// checks whether self contact condition leads to a master element
/// which is closet but not orthogonally opposite to slave surface
inline bool isValidSelfContact(const UInt &, const Real & , const Vector<Real> &);
/* ------------------------------------------------------------------------ */
/* Accessors */
/* ------------------------------------------------------------------------ */
public:
/// get the mesh
AKANTU_GET_MACRO(Mesh, mesh, Mesh &)
/// returns the maximum detection distance
AKANTU_GET_MACRO(MaximumDetectionDistance, max_dd, Real);
AKANTU_SET_MACRO(MaximumDetectionDistance, max_dd, Real);
/// returns the bounding box extension
AKANTU_GET_MACRO(MaximumBoundingBox, max_bb, Real);
AKANTU_SET_MACRO(MaximumBoundingBox, max_bb, Real);
/// returns the minimum detection distance
AKANTU_GET_MACRO(MinimumDetectionDistance, min_dd, Real);
AKANTU_SET_MACRO(MinimumDetectionDistance, min_dd, Real);
AKANTU_GET_MACRO_NOT_CONST(Positions, positions, Array<Real> &);
AKANTU_SET_MACRO(Positions, positions, Array<Real>);
AKANTU_GET_MACRO_NOT_CONST(SurfaceSelector, *surface_selector,
SurfaceSelector &);
AKANTU_SET_MACRO(SurfaceSelector, surface_selector,
std::shared_ptr<SurfaceSelector>);
/* ------------------------------------------------------------------------ */
/* Class Members */
/* ------------------------------------------------------------------------ */
private:
/// maximal detection distance for grid spacing
Real max_dd;
/// minimal detection distance for grid spacing
Real min_dd;
/// maximal bounding box extension
Real max_bb;
/// Mesh
Mesh & mesh;
/// dimension of the model
UInt spatial_dimension{0};
/// node selector for selecting master and slave nodes
std::shared_ptr<SurfaceSelector> surface_selector;
/// contact pair slave node to closet master node
std::vector<std::pair<UInt, UInt>> contact_pairs;
/// contains the updated positions of the nodes
Array<Real> positions;
/// type of detection explicit/implicit
DetectionType detection_type;
};
} // namespace akantu
#include "contact_detector_inline_impl.cc"
#endif /* __AKANTU_CONTACT_DETECTOR_HH__ */

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