Page MenuHomec4science
Files F63812743

MeshQuad4.hpp
No OneTemporary
Actions

File Metadata

Created
Wed, May 22, 15:52

MeshQuad4.hpp
View Options

/* =================================================================================================
(c - GPLv3) T.W.J. de Geus (Tom) | tom@geus.me | www.geus.me | github.com/tdegeus/GooseFEM
================================================================================================= */
#ifndef GOOSEFEM_MESHQUAD4_HPP
#define GOOSEFEM_MESHQUAD4_HPP
// -------------------------------------------------------------------------------------------------
#include "MeshQuad4.h"
// =================================================================================================
namespace GooseFEM {
namespace Mesh {
namespace Quad4 {
// -------------------------------------------------------------------------------------------------
inline Regular::Regular(size_t nelx, size_t nely, double h):
m_h(h), m_nelx(nelx), m_nely(nely)
{
assert( m_nelx >= 1 );
assert( m_nely >= 1 );
m_nnode = (m_nelx+1) * (m_nely+1);
m_nelem = m_nelx * m_nely ;
}
// -------------------------------------------------------------------------------------------------
inline size_t Regular::nelem() const
{ return m_nelem; }
inline size_t Regular::nnode() const
{ return m_nnode; }
inline size_t Regular::nne() const
{ return m_nne; }
inline size_t Regular::ndim() const
{ return m_ndim; }
// -------------------------------------------------------------------------------------------------
inline size_t Regular::nnodePeriodic() const
{
return (m_nelx+1) * (m_nely+1) - (m_nely+1) - (m_nelx);
}
// -------------------------------------------------------------------------------------------------
inline xt::xtensor<double,2> Regular::coor() const
{
xt::xtensor<double,2> out = xt::empty<double>({m_nnode, m_ndim});
xt::xtensor<double,1> x = xt::linspace<double>(0.0, m_h*static_cast<double>(m_nelx), m_nelx+1);
xt::xtensor<double,1> y = xt::linspace<double>(0.0, m_h*static_cast<double>(m_nely), m_nely+1);
size_t inode = 0;
for ( size_t iy = 0 ; iy < m_nely+1 ; ++iy ) {
for ( size_t ix = 0 ; ix < m_nelx+1 ; ++ix ) {
out(inode,0) = x(ix);
out(inode,1) = y(iy);
++inode;
}
}
return out;
}
// -------------------------------------------------------------------------------------------------
inline xt::xtensor<size_t,2> Regular::conn() const
{
xt::xtensor<size_t,2> out = xt::empty<size_t>({m_nelem,m_nne});
size_t ielem = 0;
for ( size_t iy = 0 ; iy < m_nely ; ++iy ) {
for ( size_t ix = 0 ; ix < m_nelx ; ++ix ) {
out(ielem,0) = (iy )*(m_nelx+1) + (ix );
out(ielem,1) = (iy )*(m_nelx+1) + (ix+1);
out(ielem,3) = (iy+1)*(m_nelx+1) + (ix );
out(ielem,2) = (iy+1)*(m_nelx+1) + (ix+1);
++ielem;
}
}
return out;
}
// -------------------------------------------------------------------------------------------------
inline xt::xtensor<size_t,1> Regular::nodesBottomEdge() const
{
xt::xtensor<size_t,1> out = xt::empty<size_t>({m_nelx+1});
for ( size_t ix = 0 ; ix < m_nelx+1 ; ++ix )
out(ix) = ix;
return out;
}
// -------------------------------------------------------------------------------------------------
inline xt::xtensor<size_t,1> Regular::nodesTopEdge() const
{
xt::xtensor<size_t,1> out = xt::empty<size_t>({m_nelx+1});
for ( size_t ix = 0 ; ix < m_nelx+1 ; ++ix )
out(ix) = ix + m_nely*(m_nelx+1);
return out;
}
// -------------------------------------------------------------------------------------------------
inline xt::xtensor<size_t,1> Regular::nodesLeftEdge() const
{
xt::xtensor<size_t,1> out = xt::empty<size_t>({m_nely+1});
for ( size_t iy = 0 ; iy < m_nely+1 ; ++iy )
out(iy) = iy*(m_nelx+1);
return out;
}
// -------------------------------------------------------------------------------------------------
inline xt::xtensor<size_t,1> Regular::nodesRightEdge() const
{
xt::xtensor<size_t,1> out = xt::empty<size_t>({m_nely+1});
for ( size_t iy = 0 ; iy < m_nely+1 ; ++iy )
out(iy) = iy*(m_nelx+1) + m_nelx;
return out;
}
// ---------------------- node-numbers along the bottom edge, without corners ----------------------
inline xt::xtensor<size_t,1> Regular::nodesBottomOpenEdge() const
{
xt::xtensor<size_t,1> out = xt::empty<size_t>({m_nelx-1});
for ( size_t ix = 1 ; ix < m_nelx ; ++ix )
out(ix-1) = ix;
return out;
}
// ----------------------- node-numbers along the top edge, without corners ------------------------
inline xt::xtensor<size_t,1> Regular::nodesTopOpenEdge() const
{
xt::xtensor<size_t,1> out = xt::empty<size_t>({m_nelx-1});
for ( size_t ix = 1 ; ix < m_nelx ; ++ix )
out(ix-1) = ix + m_nely*(m_nelx+1);
return out;
}
// ----------------------- node-numbers along the left edge, without corners -----------------------
inline xt::xtensor<size_t,1> Regular::nodesLeftOpenEdge() const
{
xt::xtensor<size_t,1> out = xt::empty<size_t>({m_nely-1});
for ( size_t iy = 1 ; iy < m_nely ; ++iy )
out(iy-1) = iy*(m_nelx+1);
return out;
}
// ---------------------- node-numbers along the right edge, without corners -----------------------
inline xt::xtensor<size_t,1> Regular::nodesRightOpenEdge() const
{
xt::xtensor<size_t,1> out = xt::empty<size_t>({m_nely-1});
for ( size_t iy = 1 ; iy < m_nely ; ++iy )
out(iy-1) = iy*(m_nelx+1) + m_nelx;
return out;
}
// -------------------------------------------------------------------------------------------------
inline size_t Regular::nodesBottomLeftCorner() const
{
return 0;
}
// -------------------------------------------------------------------------------------------------
inline size_t Regular::nodesBottomRightCorner() const
{
return m_nelx;
}
// -------------------------------------------------------------------------------------------------
inline size_t Regular::nodesTopLeftCorner() const
{
return m_nely*(m_nelx+1);
}
// -------------------------------------------------------------------------------------------------
inline size_t Regular::nodesTopRightCorner() const
{
return m_nely*(m_nelx+1) + m_nelx;
}
// -------------------------------------------------------------------------------------------------
inline size_t Regular::nodesLeftBottomCorner() const
{ return nodesBottomLeftCorner(); }
inline size_t Regular::nodesLeftTopCorner() const
{ return nodesTopLeftCorner(); }
inline size_t Regular::nodesRightBottomCorner() const
{ return nodesBottomRightCorner(); }
inline size_t Regular::nodesRightTopCorner() const
{ return nodesTopRightCorner(); }
// -------------------------------------------------------------------------------------------------
inline xt::xtensor<size_t,2> Regular::nodesPeriodic() const
{
// edges (without corners)
xt::xtensor<size_t,1> bot = nodesBottomOpenEdge();
xt::xtensor<size_t,1> top = nodesTopOpenEdge();
xt::xtensor<size_t,1> lft = nodesLeftOpenEdge();
xt::xtensor<size_t,1> rgt = nodesRightOpenEdge();
// allocate nodal ties
// - number of tying per category
size_t tedge = bot.size() + lft.size();
size_t tnode = 3;
// - allocate
xt::xtensor<size_t,2> out = xt::empty<size_t>({tedge+tnode, std::size_t(2)});
// counter
size_t i = 0;
// tie all corners to one corner
out(i,0) = nodesBottomLeftCorner(); out(i,1) = nodesBottomRightCorner(); ++i;
out(i,0) = nodesBottomLeftCorner(); out(i,1) = nodesTopRightCorner(); ++i;
out(i,0) = nodesBottomLeftCorner(); out(i,1) = nodesTopLeftCorner(); ++i;
// tie all corresponding edges to each other
for ( size_t j = 0 ; j<bot.size() ; ++j ){ out(i,0) = bot(j); out(i,1) = top(j); ++i; }
for ( size_t j = 0 ; j<lft.size() ; ++j ){ out(i,0) = lft(j); out(i,1) = rgt(j); ++i; }
return out;
}
// -------------------------------------------------------------------------------------------------
inline size_t Regular::nodesOrigin() const
{
return nodesBottomLeftCorner();
}
// -------------------------------------------------------------------------------------------------
inline xt::xtensor<size_t,2> Regular::dofs() const
{
return GooseFEM::Mesh::dofs(m_nnode,m_ndim);
}
// -------------------------------------------------------------------------------------------------
inline xt::xtensor<size_t,2> Regular::dofsPeriodic() const
{
// DOF-numbers for each component of each node (sequential)
xt::xtensor<size_t,2> out = GooseFEM::Mesh::dofs(m_nnode,m_ndim);
// periodic node-pairs
xt::xtensor<size_t,2> nodePer = nodesPeriodic();
// eliminate 'dependent' DOFs; renumber "out" to be sequential for the remaining DOFs
for ( size_t i = 0 ; i < nodePer.shape()[0] ; ++i )
for ( size_t j = 0 ; j < m_ndim ; ++j )
out(nodePer(i,1),j) = out(nodePer(i,0),j);
// renumber "out" to be sequential
return GooseFEM::Mesh::renumber(out);
}
// -------------------------------------------------------------------------------------------------
inline FineLayer::FineLayer(size_t nelx, size_t nely, double h, size_t nfine):
m_h(h)
{
// basic assumptions
assert( nelx >= 1 );
assert( nely >= 1 );
// store basic info
m_Lx = m_h * static_cast<double>(nelx);
// compute element size in y-direction (use symmetry, compute upper half)
// -------------------------------------------------------------------------------------------------
// temporary variables
size_t nmin, ntot;
xt::xtensor<size_t,1> nhx = xt::ones<size_t>({nely});
xt::xtensor<size_t,1> nhy = xt::ones<size_t>({nely});
xt::xtensor<int ,1> refine = -1 * xt::ones<int> ({nely});
// minimum height in y-direction (half of the height because of symmetry)
if ( nely % 2 == 0 ) nmin = nely /2;
else nmin = (nely +1)/2;
// minimum number of fine layers in y-direction (minimum 1, middle layer part of this half)
if ( nfine % 2 == 0 ) nfine = nfine /2 + 1;
else nfine = (nfine+1)/2;
if ( nfine < 1 ) nfine = 1;
if ( nfine > nmin ) nfine = nmin;
// loop over element layers in y-direction, try to coarsen using these rules:
// (1) element size in y-direction <= distance to origin in y-direction
// (2) element size in x-direction should fit the total number of elements in x-direction
// (3) a certain number of layers have the minimum size "1" (are fine)
for ( size_t iy = nfine ; ; )
{
// initialize current size in y-direction
if ( iy == nfine ) ntot = nfine;
// check to stop
if ( iy >= nely or ntot >= nmin ) { nely = iy; break; }
// rules (1,2) satisfied: coarsen in x-direction
if ( 3*nhy(iy) <= ntot and nelx%(3*nhx(iy)) == 0 and ntot+nhy(iy) < nmin )
{
refine(iy) = 0;
nhy (iy) *= 2;
auto vnhy = xt::view(nhy, xt::range(iy+1, _));
auto vnhx = xt::view(nhx, xt::range(iy , _));
vnhy *= 3;
vnhx *= 3;
}
// update the number of elements in y-direction
ntot += nhy(iy);
// proceed to next element layer in y-direction
++iy;
// check to stop
if ( iy >= nely or ntot >= nmin ) { nely = iy; break; }
}
// symmetrize, compute full information
// -------------------------------------------------------------------------------------------------
// allocate mesh constructor parameters
m_nhx = xt::empty<size_t>({nely*2-1});
m_nhy = xt::empty<size_t>({nely*2-1});
m_refine = xt::empty<int> ({nely*2-1});
m_nelx = xt::empty<size_t>({nely*2-1});
m_nnd = xt::empty<size_t>({nely*2 });
m_startElem = xt::empty<size_t>({nely*2-1});
m_startNode = xt::empty<size_t>({nely*2 });
// fill
// - lower half
for ( size_t iy = 0 ; iy < nely ; ++iy )
{
m_nhx (iy) = nhx (nely-iy-1);
m_nhy (iy) = nhy (nely-iy-1);
m_refine(iy) = refine(nely-iy-1);
}
// - upper half
for ( size_t iy = 0 ; iy < nely-1 ; ++iy )
{
m_nhx (iy+nely) = nhx (iy+1);
m_nhy (iy+nely) = nhy (iy+1);
m_refine(iy+nely) = refine(iy+1);
}
// update size
nely = m_nhx.size();
// compute the number of elements per element layer in y-direction
for ( size_t iy = 0 ; iy < nely ; ++iy )
m_nelx(iy) = nelx / m_nhx(iy);
// compute the number of nodes per node layer in y-direction
for ( size_t iy = 0 ; iy < (nely+1)/2 ; ++iy ) m_nnd(iy ) = m_nelx(iy)+1;
for ( size_t iy = (nely-1)/2 ; iy < nely ; ++iy ) m_nnd(iy+1) = m_nelx(iy)+1;
// compute mesh dimensions
// -----------------------
// initialize
m_nnode = 0;
m_nelem = 0;
m_startNode(0) = 0;
// loop over element layers (bottom -> middle, elements become finer)
for ( size_t i = 0 ; i < (nely-1)/2 ; ++i )
{
// - store the first element of the layer
m_startElem(i) = m_nelem;
// - add the nodes of this layer
if ( m_refine(i) == 0 ) { m_nnode += (3*m_nelx(i)+1); }
else { m_nnode += ( m_nelx(i)+1); }
// - add the elements of this layer
if ( m_refine(i) == 0 ) { m_nelem += (4*m_nelx(i) ); }
else { m_nelem += ( m_nelx(i) ); }
// - store the starting node of the next layer
m_startNode(i+1) = m_nnode;
}
// loop over element layers (middle -> top, elements become coarser)
for ( size_t i = (nely-1)/2 ; i < nely ; ++i )
{
// - store the first element of the layer
m_startElem(i) = m_nelem;
// - add the nodes of this layer
if ( m_refine(i) == 0 ) { m_nnode += (5*m_nelx(i)+1); }
else { m_nnode += ( m_nelx(i)+1); }
// - add the elements of this layer
if ( m_refine(i) == 0 ) { m_nelem += (4*m_nelx(i) ); }
else { m_nelem += ( m_nelx(i) ); }
// - store the starting node of the next layer
m_startNode(i+1) = m_nnode;
}
// - add the top row of nodes
m_nnode += m_nelx(nely-1)+1;
}
// -------------------------------------------------------------------------------------------------
inline size_t FineLayer::nelem() const
{ return m_nelem; }
inline size_t FineLayer::nnode() const
{ return m_nnode; }
inline size_t FineLayer::nne() const
{ return m_nne; }
inline size_t FineLayer::ndim() const
{ return m_ndim; }
// -------------------------------------------------------------------------------------------------
inline size_t FineLayer::shape(size_t i) const
{
assert( i >= 0 and i <= 1 );
if ( i == 0 ) return xt::amax(m_nelx)[0];
else return xt::sum (m_nhy )[0];
}
// -------------------------------------------------------------------------------------------------
inline xt::xtensor<double,2> FineLayer::coor() const
{
// allocate output
xt::xtensor<double,2> out = xt::empty<double>({m_nnode, m_ndim});
// current node, number of element layers
size_t inode = 0;
size_t nely = static_cast<size_t>(m_nhy.size());
// y-position of each main node layer (i.e. excluding node layers for refinement/coarsening)
// - allocate
xt::xtensor<double,1> y = xt::empty<double>({nely+1});
// - initialize
y(0) = 0.0;
// - compute
for ( size_t iy = 1 ; iy < nely+1 ; ++iy )
y(iy) = y(iy-1) + m_nhy(iy-1) * m_h;
// loop over element layers (bottom -> middle) : add bottom layer (+ refinement layer) of nodes
// -------------------------------------------------------------------------------------------------
for ( size_t iy = 0 ; ; ++iy )
{
// get positions along the x- and z-axis
xt::xtensor<double,1> x = xt::linspace<double>(0.0, m_Lx, m_nelx(iy)+1);
// add nodes of the bottom layer of this element
for ( size_t ix = 0 ; ix < m_nelx(iy)+1 ; ++ix ) {
out(inode,0) = x(ix);
out(inode,1) = y(iy);
++inode;
}
// stop at middle layer
if ( iy == (nely-1)/2 )
break;
// add extra nodes of the intermediate layer, for refinement in x-direction
if ( m_refine(iy) == 0 )
{
// - get position offset in x- and y-direction
double dx = m_h * static_cast<double>(m_nhx(iy)/3);
double dy = m_h * static_cast<double>(m_nhy(iy)/2);
// - add nodes of the intermediate layer
for ( size_t ix = 0 ; ix < m_nelx(iy) ; ++ix ) {
for ( size_t j = 0 ; j < 2 ; ++j ) {
out(inode,0) = x(ix) + dx * static_cast<double>(j+1);
out(inode,1) = y(iy) + dy;
++inode;
}
}
}
}
// loop over element layers (middle -> top) : add (refinement layer +) top layer of nodes
// -------------------------------------------------------------------------------------------------
for ( size_t iy = (nely-1)/2 ; iy < nely ; ++iy )
{
// get positions along the x- and z-axis
xt::xtensor<double,1> x = xt::linspace<double>(0.0, m_Lx, m_nelx(iy)+1);
// add extra nodes of the intermediate layer, for refinement in x-direction
if ( m_refine(iy) == 0 )
{
// - get position offset in x- and y-direction
double dx = m_h * static_cast<double>(m_nhx(iy)/3);
double dy = m_h * static_cast<double>(m_nhy(iy)/2);
// - add nodes of the intermediate layer
for ( size_t ix = 0 ; ix < m_nelx(iy) ; ++ix ) {
for ( size_t j = 0 ; j < 2 ; ++j ) {
out(inode,0) = x(ix) + dx * static_cast<double>(j+1);
out(inode,1) = y(iy) + dy;
++inode;
}
}
}
// add nodes of the top layer of this element
for ( size_t ix = 0 ; ix < m_nelx(iy)+1 ; ++ix ) {
out(inode,0) = x(ix );
out(inode,1) = y(iy+1);
++inode;
}
}
return out;
}
// -------------------------------------------------------------------------------------------------
inline xt::xtensor<size_t,2> FineLayer::conn() const
{
// allocate output
xt::xtensor<size_t,2> out = xt::empty<size_t>({m_nelem, m_nne});
// current element, number of element layers, starting nodes of each node layer
size_t ielem = 0;
size_t nely = static_cast<size_t>(m_nhy.size());
size_t bot,mid,top;
// loop over all element layers
for ( size_t iy = 0 ; iy < nely ; ++iy )
{
// - get: starting nodes of bottom(, middle) and top layer
bot = m_startNode(iy );
mid = m_startNode(iy ) + m_nnd(iy);
top = m_startNode(iy+1);
// - define connectivity: no coarsening/refinement
if ( m_refine(iy) == -1 )
{
for ( size_t ix = 0 ; ix < m_nelx(iy) ; ++ix ) {
out(ielem,0) = bot + (ix );
out(ielem,1) = bot + (ix+1);
out(ielem,2) = top + (ix+1);
out(ielem,3) = top + (ix );
ielem++;
}
}
// - define connectivity: refinement along the x-direction (below the middle layer)
else if ( m_refine(iy) == 0 and iy <= (nely-1)/2 )
{
for ( size_t ix = 0 ; ix < m_nelx(iy) ; ++ix ) {
// -- bottom element
out(ielem,0) = bot + ( ix );
out(ielem,1) = bot + ( ix+1);
out(ielem,2) = mid + (2*ix+1);
out(ielem,3) = mid + (2*ix );
ielem++;
// -- top-right element
out(ielem,0) = bot + ( ix+1);
out(ielem,1) = top + (3*ix+3);
out(ielem,2) = top + (3*ix+2);
out(ielem,3) = mid + (2*ix+1);
ielem++;
// -- top-center element
out(ielem,0) = mid + (2*ix );
out(ielem,1) = mid + (2*ix+1);
out(ielem,2) = top + (3*ix+2);
out(ielem,3) = top + (3*ix+1);
ielem++;
// -- top-left element
out(ielem,0) = bot + ( ix );
out(ielem,1) = mid + (2*ix );
out(ielem,2) = top + (3*ix+1);
out(ielem,3) = top + (3*ix );
ielem++;
}
}
// - define connectivity: coarsening along the x-direction (above the middle layer)
else if ( m_refine(iy) == 0 and iy > (nely-1)/2 )
{
for ( size_t ix = 0 ; ix < m_nelx(iy) ; ++ix ) {
// -- lower-left element
out(ielem,0) = bot + (3*ix );
out(ielem,1) = bot + (3*ix+1);
out(ielem,2) = mid + (2*ix );
out(ielem,3) = top + ( ix );
ielem++;
// -- lower-center element
out(ielem,0) = bot + (3*ix+1);
out(ielem,1) = bot + (3*ix+2);
out(ielem,2) = mid + (2*ix+1);
out(ielem,3) = mid + (2*ix );
ielem++;
// -- lower-right element
out(ielem,0) = bot + (3*ix+2);
out(ielem,1) = bot + (3*ix+3);
out(ielem,2) = top + ( ix+1);
out(ielem,3) = mid + (2*ix+1);
ielem++;
// -- upper element
out(ielem,0) = mid + (2*ix );
out(ielem,1) = mid + (2*ix+1);
out(ielem,2) = top + ( ix+1);
out(ielem,3) = top + ( ix );
ielem++;
}
}
}
return out;
}
// -------------------------------------------------------------------------------------------------
inline xt::xtensor<size_t,1> FineLayer::elementsMiddleLayer() const
{
// number of element layers in y-direction, the index of the middle layer
size_t nely = static_cast<size_t>(m_nhy.size());
size_t iy = (nely-1)/2;
xt::xtensor<size_t,1> out = xt::empty<size_t>({m_nelx(iy)});
for ( size_t ix = 0 ; ix < m_nelx(iy) ; ++ix )
out(ix) = m_startElem(iy) + ix;
return out;
}
// -------------------------------------------------------------------------------------------------
inline xt::xtensor<size_t,1> FineLayer::nodesBottomEdge() const
{
xt::xtensor<size_t,1> out = xt::empty<size_t>({m_nelx(0)+1});
for ( size_t ix = 0 ; ix < m_nelx(0)+1 ; ++ix )
out(ix) = m_startNode(0) + ix;
return out;
}
// -------------------------------------------------------------------------------------------------
inline xt::xtensor<size_t,1> FineLayer::nodesTopEdge() const
{
size_t nely = static_cast<size_t>(m_nhy.size());
xt::xtensor<size_t,1> out = xt::empty<size_t>({m_nelx(nely-1)+1});
for ( size_t ix = 0 ; ix < m_nelx(nely-1)+1 ; ++ix )
out(ix) = m_startNode(nely) + ix;
return out;
}
// -------------------------------------------------------------------------------------------------
inline xt::xtensor<size_t,1> FineLayer::nodesLeftEdge() const
{
size_t nely = static_cast<size_t>(m_nhy.size());
xt::xtensor<size_t,1> out = xt::empty<size_t>({nely+1});
for ( size_t iy = 0 ; iy < (nely+1)/2 ; ++iy )
out(iy) = m_startNode(iy);
for ( size_t iy = (nely-1)/2 ; iy < nely ; ++iy )
out(iy+1) = m_startNode(iy+1);
return out;
}
// -------------------------------------------------------------------------------------------------
inline xt::xtensor<size_t,1> FineLayer::nodesRightEdge() const
{
size_t nely = static_cast<size_t>(m_nhy.size());
xt::xtensor<size_t,1> out = xt::empty<size_t>({nely+1});
for ( size_t iy = 0 ; iy < (nely+1)/2 ; ++iy )
out(iy) = m_startNode(iy) + m_nelx(iy);
for ( size_t iy = (nely-1)/2 ; iy < nely ; ++iy )
out(iy+1) = m_startNode(iy+1) + m_nelx(iy);
return out;
}
// ---------------------- node-numbers along the bottom edge, without corners ----------------------
inline xt::xtensor<size_t,1> FineLayer::nodesBottomOpenEdge() const
{
xt::xtensor<size_t,1> out = xt::empty<size_t>({m_nelx(0)-1});
for ( size_t ix = 1 ; ix < m_nelx(0) ; ++ix )
out(ix-1) = m_startNode(0) + ix;
return out;
}
// ----------------------- node-numbers along the top edge, without corners ------------------------
inline xt::xtensor<size_t,1> FineLayer::nodesTopOpenEdge() const
{
size_t nely = static_cast<size_t>(m_nhy.size());
xt::xtensor<size_t,1> out = xt::empty<size_t>({m_nelx(nely-1)-1});
for ( size_t ix = 1 ; ix < m_nelx(nely-1) ; ++ix )
out(ix-1) = m_startNode(nely) + ix;
return out;
}
// ----------------------- node-numbers along the left edge, without corners -----------------------
inline xt::xtensor<size_t,1> FineLayer::nodesLeftOpenEdge() const
{
size_t nely = static_cast<size_t>(m_nhy.size());
xt::xtensor<size_t,1> out = xt::empty<size_t>({nely-1});
for ( size_t iy = 1 ; iy < (nely+1)/2 ; ++iy )
out(iy-1) = m_startNode(iy);
for ( size_t iy = (nely-1)/2 ; iy < nely-1 ; ++iy )
out(iy) = m_startNode(iy+1);
return out;
}
// ---------------------- node-numbers along the right edge, without corners -----------------------
inline xt::xtensor<size_t,1> FineLayer::nodesRightOpenEdge() const
{
size_t nely = static_cast<size_t>(m_nhy.size());
xt::xtensor<size_t,1> out = xt::empty<size_t>({nely-1});
for ( size_t iy = 1 ; iy < (nely+1)/2 ; ++iy )
out(iy-1) = m_startNode(iy) + m_nelx(iy);
for ( size_t iy = (nely-1)/2 ; iy < nely-1 ; ++iy )
out(iy) = m_startNode(iy+1) + m_nelx(iy);
return out;
}
// -------------------------------------------------------------------------------------------------
inline size_t FineLayer::nodesBottomLeftCorner() const
{
return m_startNode(0);
}
// -------------------------------------------------------------------------------------------------
inline size_t FineLayer::nodesBottomRightCorner() const
{
return m_startNode(0) + m_nelx(0);
}
// -------------------------------------------------------------------------------------------------
inline size_t FineLayer::nodesTopLeftCorner() const
{
size_t nely = static_cast<size_t>(m_nhy.size());
return m_startNode(nely);
}
// -------------------------------------------------------------------------------------------------
inline size_t FineLayer::nodesTopRightCorner() const
{
size_t nely = static_cast<size_t>(m_nhy.size());
return m_startNode(nely) + m_nelx(nely-1);
}
// -------------------------------------------------------------------------------------------------
inline size_t FineLayer::nodesLeftBottomCorner() const { return nodesBottomLeftCorner(); }
inline size_t FineLayer::nodesRightBottomCorner() const { return nodesBottomRightCorner(); }
inline size_t FineLayer::nodesLeftTopCorner() const { return nodesTopLeftCorner(); }
inline size_t FineLayer::nodesRightTopCorner() const { return nodesTopRightCorner(); }
// -------------------------------------------------------------------------------------------------
inline xt::xtensor<size_t,2> FineLayer::nodesPeriodic() const
{
// edges (without corners)
xt::xtensor<size_t,1> bot = nodesBottomOpenEdge();
xt::xtensor<size_t,1> top = nodesTopOpenEdge();
xt::xtensor<size_t,1> lft = nodesLeftOpenEdge();
xt::xtensor<size_t,1> rgt = nodesRightOpenEdge();
// allocate nodal ties
// - number of tying per category
size_t tedge = bot.size() + lft.size();
size_t tnode = 3;
// - allocate
xt::xtensor<size_t,2> out = xt::empty<size_t>({tedge+tnode, std::size_t(2)});
// counter
size_t i = 0;
// tie all corners to one corner
out(i,0) = nodesBottomLeftCorner(); out(i,1) = nodesBottomRightCorner(); ++i;
out(i,0) = nodesBottomLeftCorner(); out(i,1) = nodesTopRightCorner(); ++i;
out(i,0) = nodesBottomLeftCorner(); out(i,1) = nodesTopLeftCorner(); ++i;
// tie all corresponding edges to each other
for ( size_t j = 0 ; j<bot.size() ; ++j ){ out(i,0) = bot(j); out(i,1) = top(j); ++i; }
for ( size_t j = 0 ; j<lft.size() ; ++j ){ out(i,0) = lft(j); out(i,1) = rgt(j); ++i; }
return out;
}
// -------------------------------------------------------------------------------------------------
inline size_t FineLayer::nodesOrigin() const
{
return nodesBottomLeftCorner();
}
// -------------------------------------------------------------------------------------------------
inline xt::xtensor<size_t,2> FineLayer::dofs() const
{
return GooseFEM::Mesh::dofs(m_nnode,m_ndim);
}
// -------------------------------------------------------------------------------------------------
inline xt::xtensor<size_t,2> FineLayer::dofsPeriodic() const
{
// DOF-numbers for each component of each node (sequential)
xt::xtensor<size_t,2> out = GooseFEM::Mesh::dofs(m_nnode,m_ndim);
// periodic node-pairs
xt::xtensor<size_t,2> nodePer = nodesPeriodic();
// eliminate 'dependent' DOFs; renumber "out" to be sequential for the remaining DOFs
for ( size_t i = 0 ; i < nodePer.shape()[0] ; ++i )
for ( size_t j = 0 ; j < m_ndim ; ++j )
out(nodePer(i,1),j) = out(nodePer(i,0),j);
// renumber "out" to be sequential
return GooseFEM::Mesh::renumber(out);
}
// -------------------------------------------------------------------------------------------------
}}} // namespace ...
// =================================================================================================
#endif

Event Timeline

c4science · Help