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ElementHex8.h
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Tue, May 28, 05:46
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text/x-c++
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Thu, May 30, 05:46 (2 d)
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rGOOSEFEM GooseFEM
ElementHex8.h
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/*
(c - GPLv3) T.W.J. de Geus (Tom) | tom@geus.me | www.geus.me | github.com/tdegeus/GooseFEM
*/
#ifndef GOOSEFEM_ELEMENTHEX8_H
#define GOOSEFEM_ELEMENTHEX8_H
#include "config.h"
namespace
GooseFEM
{
namespace
Element
{
namespace
Hex8
{
template
<
class
T
>
inline
double
inv
(
const
T
&
A
,
T
&
Ainv
);
namespace
Gauss
{
inline
size_t
nip
();
// number of integration points
inline
xt
::
xtensor
<
double
,
2
>
xi
();
// integration point coordinates (local coordinates)
inline
xt
::
xtensor
<
double
,
1
>
w
();
// integration point weights
}
// namespace Gauss
namespace
Nodal
{
inline
size_t
nip
();
// number of integration points
inline
xt
::
xtensor
<
double
,
2
>
xi
();
// integration point coordinates (local coordinates)
inline
xt
::
xtensor
<
double
,
1
>
w
();
// integration point weights
}
// namespace Nodal
class
Quadrature
:
public
GooseFEM
::
Element
::
QuadratureBase
<
8
,
3
,
3
>
{
public:
// Fixed dimensions:
// ndim = 3 - number of dimensions
// nne = 8 - number of nodes per element
//
// Naming convention:
// "elemmat" - matrices stored per element - [nelem, nne*ndim, nne*ndim]
// "elemvec" - nodal vectors stored per element - [nelem, nne, ndim]
// "qtensor" - integration point tensor - [nelem, nip, ndim, ndim]
// "qscalar" - integration point scalar - [nelem, nip]
// Constructor: integration point coordinates and weights are optional (default: Gauss)
Quadrature
()
=
default
;
Quadrature
(
const
xt
::
xtensor
<
double
,
3
>&
x
);
Quadrature
(
const
xt
::
xtensor
<
double
,
3
>&
x
,
const
xt
::
xtensor
<
double
,
2
>&
xi
,
const
xt
::
xtensor
<
double
,
1
>&
w
);
// Update the nodal positions (shape of "x" should match the earlier definition)
void
update_x
(
const
xt
::
xtensor
<
double
,
3
>&
x
);
// Return shape function gradients
xt
::
xtensor
<
double
,
4
>
GradN
()
const
;
// Return integration volume
xt
::
xtensor
<
double
,
2
>
dV
()
const
;
// Dyadic product (and its transpose and symmetric part)
// qtensor(i,j) += dNdx(m,i) * elemvec(m,j)
void
gradN_vector
(
const
xt
::
xtensor
<
double
,
3
>&
elemvec
,
xt
::
xtensor
<
double
,
4
>&
qtensor
)
const
;
void
gradN_vector_T
(
const
xt
::
xtensor
<
double
,
3
>&
elemvec
,
xt
::
xtensor
<
double
,
4
>&
qtensor
)
const
;
void
symGradN_vector
(
const
xt
::
xtensor
<
double
,
3
>&
elemvec
,
xt
::
xtensor
<
double
,
4
>&
qtensor
)
const
;
// Integral of the scalar product
// elemmat(m*ndim+i,n*ndim+i) += N(m) * qscalar * N(n) * dV
void
int_N_scalar_NT_dV
(
const
xt
::
xtensor
<
double
,
2
>&
qscalar
,
xt
::
xtensor
<
double
,
3
>&
elemmat
)
const
;
// Integral of the dot product
// elemvec(m,j) += dNdx(m,i) * qtensor(i,j) * dV
void
int_gradN_dot_tensor2_dV
(
const
xt
::
xtensor
<
double
,
4
>&
qtensor
,
xt
::
xtensor
<
double
,
3
>&
elemvec
)
const
;
// Integral of the dot product
// elemmat(m*2+j, n*2+k) += dNdx(m,i) * qtensor(i,j,k,l) * dNdx(n,l) * dV
void
int_gradN_dot_tensor4_dot_gradNT_dV
(
const
xt
::
xtensor
<
double
,
6
>&
qtensor
,
xt
::
xtensor
<
double
,
3
>&
elemmat
)
const
;
// Auto-allocation of the functions above
xt
::
xtensor
<
double
,
4
>
GradN_vector
(
const
xt
::
xtensor
<
double
,
3
>&
elemvec
)
const
;
xt
::
xtensor
<
double
,
4
>
GradN_vector_T
(
const
xt
::
xtensor
<
double
,
3
>&
elemvec
)
const
;
xt
::
xtensor
<
double
,
4
>
SymGradN_vector
(
const
xt
::
xtensor
<
double
,
3
>&
elemvec
)
const
;
xt
::
xtensor
<
double
,
3
>
Int_N_scalar_NT_dV
(
const
xt
::
xtensor
<
double
,
2
>&
qscalar
)
const
;
xt
::
xtensor
<
double
,
3
>
Int_gradN_dot_tensor2_dV
(
const
xt
::
xtensor
<
double
,
4
>&
qtensor
)
const
;
xt
::
xtensor
<
double
,
3
>
Int_gradN_dot_tensor4_dot_gradNT_dV
(
const
xt
::
xtensor
<
double
,
6
>&
qtensor
)
const
;
private:
// Compute "vol" and "dNdx" based on current "x"
void
compute_dN
();
private:
xt
::
xtensor
<
double
,
3
>
m_x
;
// nodal positions stored per element [nelem, nne, ndim]
xt
::
xtensor
<
double
,
1
>
m_w
;
// weight of each integration point [nip]
xt
::
xtensor
<
double
,
2
>
m_xi
;
// local coordinate of each integration point [nip, ndim]
xt
::
xtensor
<
double
,
2
>
m_N
;
// shape functions [nip, nne]
xt
::
xtensor
<
double
,
3
>
m_dNxi
;
// shape function grad. wrt local coor. [nip, nne, ndim]
xt
::
xtensor
<
double
,
4
>
m_dNx
;
// shape function grad. wrt global coor. [nelem, nip, nne, ndim]
xt
::
xtensor
<
double
,
2
>
m_vol
;
// integration point volume [nelem, nip]
};
}
// namespace Hex8
}
// namespace Element
}
// namespace GooseFEM
#include "ElementHex8.hpp"
#endif
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