Real InfHex::quality (const ElemQuality q) const
{
switch (q)
{
/**
* Compue the min/max diagonal ratio.
* Source: CUBIT User's Manual.
*
* For infinite elements, we just only compute
* the diagonal in the face...
* Don't know whether this makes sense,
* but should be a feasible way.
*/
case DIAGONAL:
{
// Diagonal between node 0 and node 2
const Real d02 = this->length(0,2);
// Diagonal between node 1 and node 3
const Real d13 = this->length(1,3);
// Find the biggest and smallest diagonals
const Real min = std::min(d02, d13);
const Real max = std::max(d02, d13);
libmesh_assert_not_equal_to (max, 0.0);
return min / max;
break;
}
/**
* Minimum ratio of lengths derived from opposite edges.
* Source: CUBIT User's Manual.
*
* For IFEMs, do this only for the base face...
* Does this make sense?
*/
case TAPER:
{
/**
* Compute the side lengths.
*/
const Real d01 = this->length(0,1);
const Real d12 = this->length(1,2);
const Real d23 = this->length(2,3);
const Real d03 = this->length(0,3);
std::vector<Real> edge_ratios(2);
// Bottom
edge_ratios[8] = std::min(d01, d23) / std::max(d01, d23);
edge_ratios[9] = std::min(d03, d12) / std::max(d03, d12);
return *(std::min_element(edge_ratios.begin(), edge_ratios.end())) ;
break;
}
/**
* Minimum edge length divided by max diagonal length.
* Source: CUBIT User's Manual.
*
* And again, we mess around a bit, for the IFEMs...
* Do this only for the base.
*/
case STRETCH:
{
/**
* Should this be a sqrt2, when we do this for the base only?
*/
const Real sqrt3 = 1.73205080756888;
/**
* Compute the maximum diagonal in the base.
*/
const Real d02 = this->length(0,2);
const Real d13 = this->length(1,3);
const Real max_diag = std::max(d02, d13);
libmesh_assert_not_equal_to ( max_diag, 0.0 );
/**
* Compute the minimum edge length in the base.
*/
std::vector<Real> edges(4);
edges[0] = this->length(0,1);
edges[1] = this->length(1,2);
edges[2] = this->length(2,3);
edges[3] = this->length(0,3);
const Real min_edge = *(std::min_element(edges.begin(), edges.end()));
return sqrt3 * min_edge / max_diag ;
break;
}
/**
* I don't know what to do for this metric.
* Maybe the base class knows...
*/
default:
{
return Elem::quality(q);
}
}
// Will never get here...
libmesh_error();
return 0.;
}
Real Hex::quality (const ElemQuality q) const
{
switch (q)
{
/**
* Compue the min/max diagonal ratio.
* Source: CUBIT User's Manual.
*/
case DIAGONAL:
{
// Diagonal between node 0 and node 6
const Real d06 = this->length(0,6);
// Diagonal between node 3 and node 5
const Real d35 = this->length(3,5);
// Diagonal between node 1 and node 7
const Real d17 = this->length(1,7);
// Diagonal between node 2 and node 4
const Real d24 = this->length(2,4);
// Find the biggest and smallest diagonals
const Real min = std::min(d06, std::min(d35, std::min(d17, d24)));
const Real max = std::max(d06, std::max(d35, std::max(d17, d24)));
libmesh_assert_not_equal_to (max, 0.0);
return min / max;
break;
}
/**
* Minimum ratio of lengths derived from opposite edges.
* Source: CUBIT User's Manual.
*/
case TAPER:
{
/**
* Compute the side lengths.
*/
const Real d01 = this->length(0,1);
const Real d12 = this->length(1,2);
const Real d23 = this->length(2,3);
const Real d03 = this->length(0,3);
const Real d45 = this->length(4,5);
const Real d56 = this->length(5,6);
const Real d67 = this->length(6,7);
const Real d47 = this->length(4,7);
const Real d04 = this->length(0,4);
const Real d15 = this->length(1,5);
const Real d37 = this->length(3,7);
const Real d26 = this->length(2,6);
std::vector<Real> edge_ratios(12);
// Front
edge_ratios[0] = std::min(d01, d45) / std::max(d01, d45);
edge_ratios[1] = std::min(d04, d15) / std::max(d04, d15);
// Right
edge_ratios[2] = std::min(d15, d26) / std::max(d15, d26);
edge_ratios[3] = std::min(d12, d56) / std::max(d12, d56);
// Back
edge_ratios[4] = std::min(d67, d23) / std::max(d67, d23);
edge_ratios[5] = std::min(d26, d37) / std::max(d26, d37);
// Left
edge_ratios[6] = std::min(d04, d37) / std::max(d04, d37);
edge_ratios[7] = std::min(d03, d47) / std::max(d03, d47);
// Bottom
edge_ratios[8] = std::min(d01, d23) / std::max(d01, d23);
edge_ratios[9] = std::min(d03, d12) / std::max(d03, d12);
// Top
edge_ratios[10] = std::min(d45, d67) / std::max(d45, d67);
edge_ratios[11] = std::min(d56, d47) / std::max(d56, d47);
return *(std::min_element(edge_ratios.begin(), edge_ratios.end())) ;
break;
}
/**
* Minimum edge length divided by max diagonal length.
* Source: CUBIT User's Manual.
*/
case STRETCH:
{
const Real sqrt3 = 1.73205080756888;
/**
* Compute the maximum diagonal.
*/
const Real d06 = this->length(0,6);
const Real d17 = this->length(1,7);
const Real d35 = this->length(3,5);
const Real d24 = this->length(2,4);
const Real max_diag = std::max(d06, std::max(d17, std::max(d35, d24)));
libmesh_assert_not_equal_to ( max_diag, 0.0 );
/**
* Compute the minimum edge length.
*/
std::vector<Real> edges(12);
edges[0] = this->length(0,1);
edges[1] = this->length(1,2);
edges[2] = this->length(2,3);
edges[3] = this->length(0,3);
edges[4] = this->length(4,5);
edges[5] = this->length(5,6);
edges[6] = this->length(6,7);
edges[7] = this->length(4,7);
edges[8] = this->length(0,4);
edges[9] = this->length(1,5);
edges[10] = this->length(2,6);
edges[11] = this->length(3,7);
const Real min_edge = *(std::min_element(edges.begin(), edges.end()));
return sqrt3 * min_edge / max_diag ;
}
/**
* I don't know what to do for this metric.
* Maybe the base class knows...
*/
default:
return Elem::quality(q);
}
libmesh_error_msg("We'll never get here!");
return 0.;
}
