chrono::fea::ChFaceTetra_4 Class Reference

Description

Face of a linear ChElementTetra_4 tetrahedron.

This is a proxy to the tetrahedron. It can be used to apply pressure loads. Note, face_id is the number of the vertex to whom it is opposed: 0,1,2,3. Corner nodes, obtainable with GetNodeN(), are in counterclockwise order seen from the outside.

#include <ChFaceTetra_4.h>

Inheritance diagram for chrono::fea::ChFaceTetra_4:
Collaboration diagram for chrono::fea::ChFaceTetra_4:

Public Member Functions

 ChFaceTetra_4 (std::shared_ptr< ChElementTetra_4 > mel, char mid)
 
std::shared_ptr< ChNodeFEAxyzGetNodeN (int i)
 
virtual void ShapeFunctions (ChMatrix<> &N, double r, double s)
 Fills the N shape function matrix (1 row, 3 columns) with the values of shape functions at r,s 'area' coordinates, all ranging in [0...1]. More...
 
virtual int LoadableGet_ndof_x ()
 Gets the number of DOFs affected by this element (position part)
 
virtual int LoadableGet_ndof_w ()
 Gets the number of DOFs affected by this element (speed part)
 
virtual void LoadableGetStateBlock_x (int block_offset, ChState &mD)
 Gets all the DOFs packed in a single vector (position part)
 
virtual void LoadableGetStateBlock_w (int block_offset, ChStateDelta &mD)
 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) override
 Increment all DOFs using a delta.
 
virtual int Get_field_ncoords ()
 Number of coordinates in the interpolated field: here the {x,y,z} displacement.
 
virtual int GetSubBlocks ()
 Tell the number of DOFs blocks (ex. =1 for a body, =4 for a tetrahedron, etc.)
 
virtual unsigned int GetSubBlockOffset (int nblock)
 Get the offset of the i-th sub-block of DOFs in global vector.
 
virtual unsigned int GetSubBlockSize (int nblock)
 Get the size of the i-th sub-block of DOFs in global vector.
 
virtual void LoadableGetVariables (std::vector< ChVariables * > &mvars)
 Get the pointers to the contained ChVariables, appending to the mvars vector.
 
virtual void ComputeNF (const double U, const double V, ChVectorDynamic<> &Qi, double &detJ, const ChVectorDynamic<> &F, ChVectorDynamic<> *state_x, ChVectorDynamic<> *state_w)
 Evaluate N'*F , where N is some type of shape function evaluated at U,V coordinates of the surface, each ranging in 0..+1 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. More...
 
virtual bool IsTriangleIntegrationNeeded ()
 If true, use quadrature over u,v in [0..1] range as triangle volumetric coords.
 
virtual ChVector ComputeNormal (const double U, const double V)
 Gets the normal to the surface at the parametric coordinate u,v. More...
 

Protected Attributes

char face_id
 
std::shared_ptr< ChElementTetra_4melement
 

Member Function Documentation

virtual void chrono::fea::ChFaceTetra_4::ComputeNF ( const double  U,
const double  V,
ChVectorDynamic<> &  Qi,
double &  detJ,
const ChVectorDynamic<> &  F,
ChVectorDynamic<> *  state_x,
ChVectorDynamic<> *  state_w 
)
virtual

Evaluate N'*F , where N is some type of shape function evaluated at U,V coordinates of the surface, each ranging in 0..+1 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, maybe with offset block_offset
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

Implements chrono::ChLoadableUV.

virtual ChVector chrono::fea::ChFaceTetra_4::ComputeNormal ( const double  U,
const double  V 
)
virtual

Gets the normal to the surface at the parametric coordinate u,v.

Normal must be considered pointing outside in case the surface is a boundary to a volume.

Implements chrono::ChLoadableUV.

virtual void chrono::fea::ChFaceTetra_4::ShapeFunctions ( ChMatrix<> &  N,
double  r,
double  s 
)
virtual

Fills the N shape function matrix (1 row, 3 columns) with the values of shape functions at r,s 'area' coordinates, all ranging in [0...1].