chrono::ChLoadableUV Class Referenceabstract

Description

Interface for objects that can be subject to area loads, distributed along UV coordinates of the object.

For instance finite elements like shells, ex.for applied pressure.

#include <ChLoadable.h>

Inheritance diagram for chrono::ChLoadableUV:
Collaboration diagram for chrono::ChLoadableUV:

Public Member Functions

virtual void ComputeNF (const double U, const double V, ChVectorDynamic<> &Qi, double &detJ, const ChVectorDynamic<> &F, ChVectorDynamic<> *state_x, ChVectorDynamic<> *state_w)=0
 Evaluate N'*F , where N is some type of shape function evaluated at U,V coordinates of the surface, each ranging in [-1..+1], except if IsTriangleIntegrationNeeded() true. More...
 
virtual ChVector3d ComputeNormal (const double U, const double V)=0
 Gets the normal to the surface at the parametric coordinate u,v. More...
 
virtual bool IsTriangleIntegrationNeeded ()
 If true, use quadrature over u,v in [0..1] range as triangle area coords (with z=1-u-v) otherwise use default quadrature over u,v in [-1..+1] as rectangular isoparametric coords.
 
- Public Member Functions inherited from chrono::ChLoadable
virtual unsigned int GetLoadableNumCoordsPosLevel ()=0
 Gets the number of DOFs affected by this element (position part)
 
virtual unsigned int GetLoadableNumCoordsVelLevel ()=0
 Gets the number of DOFs affected by this element (speed part)
 
virtual void LoadableGetStateBlockPosLevel (int block_offset, ChState &mD)=0
 Gets all the DOFs packed in a single vector (position part)
 
virtual void LoadableGetStateBlockVelLevel (int block_offset, ChStateDelta &mD)=0
 Gets all the DOFs packed in a single vector (speed part)
 
virtual void LoadableStateIncrement (const unsigned int off_x, ChState &x_new, const ChState &x, const unsigned int off_v, const ChStateDelta &Dv)=0
 Increment all DOFs using a delta. More...
 
virtual unsigned int GetNumFieldCoords ()=0
 Number of coordinates in the interpolated field (e.g., 3 for a tetrahedron, 1 for a thermal problem, etc.).
 
virtual unsigned int GetNumSubBlocks ()=0
 Get the number of DOFs sub-blocks (e.g., 1 for a body, 4 for a tetrahedron, etc.).
 
virtual unsigned int GetSubBlockOffset (unsigned int nblock)=0
 Get the offset of the specified sub-block of DOFs in global vector.
 
virtual unsigned int GetSubBlockSize (unsigned int nblock)=0
 Get the size of the specified sub-block of DOFs in global vector.
 
virtual bool IsSubBlockActive (unsigned int nblock) const =0
 Check if the specified sub-block of DOFs is active.
 
virtual void LoadableGetVariables (std::vector< ChVariables * > &mvars)=0
 Get the pointers to the contained ChVariables, appending to the mvars vector.
 

Member Function Documentation

◆ ComputeNF()

virtual void chrono::ChLoadableUV::ComputeNF ( const double  U,
const double  V,
ChVectorDynamic<> &  Qi,
double &  detJ,
const ChVectorDynamic<> &  F,
ChVectorDynamic<> *  state_x,
ChVectorDynamic<> *  state_w 
)
pure virtual

Evaluate N'*F , where N is some type of shape function evaluated at U,V coordinates of the surface, each ranging in [-1..+1], except if IsTriangleIntegrationNeeded() true.

F is a load, N'*F is the resulting generalized load Returns also det[J] with J=[dx/du,..], that might be useful in gauss quadrature.

Parameters
Uparametric coordinate in surface
Vparametric coordinate in surface
QiReturn result of N'*F here
detJReturn det[J] here
FInput F vector, size is =n. field coords.
state_xif != 0, update state (pos. part) to this, then evaluate Q
state_wif != 0, update state (speed part) to this, then evaluate Q

Implemented in chrono::fea::ChElementShellANCF_3833, chrono::fea::ChElementShellANCF_3443, chrono::fea::ChElementShellReissner4, chrono::fea::ChContactTriangleXYZRot, chrono::fea::ChElementShellBST, chrono::fea::ChElementShellANCF_3423, chrono::fea::ChContactTriangleXYZ, chrono::fea::ChHexahedronFace, and chrono::fea::ChTetrahedronFace.

◆ ComputeNormal()

virtual ChVector3d chrono::ChLoadableUV::ComputeNormal ( const double  U,
const double  V 
)
pure virtual

The documentation for this class was generated from the following file:
  • /builds/uwsbel/chrono/src/chrono/physics/ChLoadable.h