Class GlobalFrictionContact

Class GlobalFrictionContact#

Defined in Program listing for file kernel/src/simulationTools/GlobalFrictionContact.hpp

class GlobalFrictionContact : public LinearOSNS#

Formalization and Resolution of a Friction-Contact Problem.

This class is devoted to the formalization and the resolution of primal friction contact problems defined by :

\[\begin{split} M velocity = q + H reaction \\ globalVelocities = H^T velocity + tildeGlobalVelocities \end{split}\]

and \( globalVelocities, reaction \) belongs to the Coulomb friction law with unilateral contact.

With:

  • \( velocity \in R^{n} \) and \( reaction \in R^{n} \) the unknowns,

  • \( M \in R^{n \times n } \) and \( q \in R^{n} \)

  • \( globalVelocities \in R^{m} \) and \( reaction \in R^{m} \) the unknowns,

  • \( tildeGlobalVelocities \in R^{m} \) is the modified local velocity ( \( e U_{N,k} \))

  • \( M \in R^{n \times n } \) and \( q \in R^{n} \)

  • \( H \in R^{n \times m } \)

The dimension of the problem (2D or 3D) is given by the variable contactProblemDim and the right Numerics driver will be called according to this value.

Construction:

  • Constructor from data (inputs = Simulations*, id, SP::NonSmoothSolver) - The solver is optional. Main functions:

Main functions:

  • formalization of the problem: computes M,q using the set of “active” Interactions from the simulation and the interactionBlock-matrices saved in the field interactionBlocks. Functions: initialize(), computeInteractionBlock(), preCompute()

  • solving of the GlobalFrictionContact problem: function compute(), used to call solvers from Numerics through the frictionContact2D_driver() or frictionContact3D_driver() interface of Numerics.

  • post-treatment of data: set values of y/lambda variables of the active Interaction (ie Interactions) using ouput results from the solver (velocity,reaction); function postCompute().

For details regarding the available options, see Nonsmooth problems formulations and available solvers in users’ guide.

Subclassed by GlobalRollingFrictionContact

Public Functions

GlobalFrictionContact(int dimPb, int numericsSolverId = SICONOS_GLOBAL_FRICTION_3D_NSGS)#

constructor (solver id and dimension)

Parameters:

  • dimPb – dimension (2D or 3D) of the friction-contact problem

  • numericsSolverId – id of the solver to be used, optional, default : SICONOS_GLOBAL_FRICTION_3D_NSGS

GlobalFrictionContact(int dimPb, SP::SolverOptions options)#

constructor from a pre-defined solver options set

Parameters:

options – the options set

inline virtual ~GlobalFrictionContact()#

destructor

inline int getGlobalFrictionContactDim() const#

get the type of GlobalFrictionContact problem (2D or 3D)

Returns:

an int (2 or 3)

inline size_t getGlobalSizeOutput() const#

get dimension of the problem

Returns:

an unsigned ing

inline SP::SiconosVector globalVelocities() const#

get globalVelocities

Returns:

pointer on a SiconosVector

inline void setGlobalVelocities(SP::SiconosVector newPtr)#

set globalVelocities to pointer newPtr

Parameters:

newPtr – the new vector

inline SP::MuStorage mu() const#

get a pointer to mu, the list of the friction coefficients

Returns:

pointer on a std::vector<double>

inline double getMu(unsigned int i) const#

get the value of the component number i of mu, the vector of the friction coefficients

Returns:

the friction coefficient for the ith contact

void initVectorsMemory()#

Memory allocation or resizing for z,w,q,b, globalVelocities.

virtual void initialize(SP::Simulation sim)#

initialize the GlobalFrictionContact problem(compute topology …)

Parameters:

sim – the simulation, owner of this OSNSPB

SP::GlobalFrictionContactProblem globalFrictionContactProblem()#
Returns:

the friction contact problem from Numerics

GlobalFrictionContactProblem *globalFrictionContactProblemPtr()#
Returns:

the friction contact problem from Numerics (raw ptr, do not free)

int solve(SP::GlobalFrictionContactProblem problem = SP::GlobalFrictionContactProblem())#

solve a friction contact problem

Parameters:

problem – the friction contact problem

Returns:

info solver information result

virtual bool preCompute(double time)#

Construction of the problem.

Parameters:

time – current time

virtual int compute(double time)#

Compute the unknown reaction and velocity and update the Interaction (y and lambda )

Parameters:

time – current time

virtual void postCompute()#

post-treatment of output from Numerics solver: set values of the unknowns of Interactions using (velocity,reaction)

virtual void display() const#

print the data to the screen

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