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* OpenFOAM 1.5+ Export: Even further optimisations, and more code documentation added

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This commit is contained in:
Philippose Rajan 2009-10-31 19:53:43 +00:00
parent 9e64043989
commit f0a97767bd
1 changed files with 84 additions and 26 deletions
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110
libsrc/interface/writeOpenFOAM15x.cpp
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@ -35,6 +35,8 @@ namespace netgen
{
#include "writeuser.hpp"
// Global arrays used to maintain the owner, neighbour and face lists
// so that they are accessible across functions
Array<int> OF15x_owner_facelist;
Array<int> OF15x_owner_celllist;
Array<int> OF15x_neighbour_celllist;
@ -42,6 +44,7 @@ namespace netgen
Array<INDEX_2> OF15x_surfelem_lists;
void WriteOpenFOAM15xBanner(ofstream & outfile)
{
static char FOAMversion[4] = "1.5";
@ -97,7 +100,7 @@ namespace netgen
const_cast<MeshTopology&> (meshtopo).SetBuildFaces(true);
const_cast<MeshTopology&> (meshtopo).Update();
// Extract important mesh metrics
int ne = mesh.GetNE();
int nse = mesh.GetNSE();
int totfaces = meshtopo.GetNFaces();
@ -110,6 +113,9 @@ namespace netgen
OF15x_surfelem_bclist.SetSize(nse);
OF15x_surfelem_lists.SetSize(nse);
// Initialise arrays to zero if required
OF15x_neighbour_celllist = 0;
// Array used to keep track of Faces which have already been
// processed and added to the Owner list... In addition, also the
// location where the face appears in the Owner list is also stored
@ -117,17 +123,25 @@ namespace netgen
Array<int> ownerfaces(totfaces);
ownerfaces = 0;
// Array to hold the set of local faces of each volume element
// while running through the set of volume elements
Array<int> locfaces;
// Secondary indices used to independently advance the owner
// and boundary condition arrays within the main loop
int owner_ind = 1;
int bc_ind = 1;
// Loop through all the volume elements
for(int elind = 1; elind <= ne; elind++)
{
// Extract the current volume element
Element el = mesh.VolumeElement(elind);
Array<int> locfaces;
// Set the size of the array to the number of faces in the
// current volume element and initialise the elements to 0
locfaces.SetSize(el.GetNFaces());
locfaces = 0;
// Get the face numbers of the faces of the current volume element
// The values returned are given a sign depending on the orientation
@ -139,15 +153,63 @@ namespace netgen
// Loop through the faces
for(int i = 1; i <= locfaces.Size(); i++)
{
// The absolute value of a face number (because the faces
// returned by the GetElementFaces function prepend it
// with a sign depending on the face orientation)
int absfacenr = abs(locfaces.Elem(i));
// If the face already exists in the owner list, add
// the current cell into the neighbour list, in the
// same location where the face appears in the owner list
int ownerface = ownerfaces.Elem(absfacenr);
if(ownerface)
int owner_face = ownerfaces.Elem(absfacenr);
if(owner_face)
{
OF15x_neighbour_celllist.Elem(ownerface) = elind;
OF15x_neighbour_celllist.Elem(owner_face) = elind;
// From this point on, the code within this "if" block
// basically sorts the order of the the Neighbour cells (along
// with the faces list) in ascending order.
// The approach used is..... to traverse the owner and neighbour cell lists
// up and down, and sort the neighbour cells of a given owner cell
// as the list evolves.
// NOTE: A value of "zero" in the neighbour list implies that
// the neighbour has not been found yet, so the "zero" locations need
// to be skipped while sorting in ascending order
int curr_owner = OF15x_owner_celllist.Elem(owner_face);
int peek_loc = owner_face - 1;
int new_loc = owner_face;
// Traversing upwards in the list
while((OF15x_owner_celllist.Elem(peek_loc) == curr_owner) && (peek_loc >= 1))
{
if((OF15x_neighbour_celllist.Elem(peek_loc) != 0)
&& (OF15x_neighbour_celllist.Elem(new_loc) < OF15x_neighbour_celllist.Elem(peek_loc)))
{
Swap(OF15x_neighbour_celllist.Elem(new_loc),OF15x_neighbour_celllist.Elem(peek_loc));
Swap(OF15x_owner_facelist.Elem(new_loc),OF15x_owner_facelist.Elem(peek_loc));
new_loc = peek_loc;
}
peek_loc--;
}
peek_loc = owner_face + 1;
// Traversing downwards in the list
while((OF15x_owner_celllist.Elem(peek_loc) == curr_owner) && (peek_loc <= owner_ind))
{
if((OF15x_neighbour_celllist.Elem(peek_loc) != 0)
&& (OF15x_neighbour_celllist.Elem(new_loc) > OF15x_neighbour_celllist.Elem(peek_loc)))
{
Swap(OF15x_neighbour_celllist.Elem(new_loc),OF15x_neighbour_celllist.Elem(peek_loc));
Swap(OF15x_owner_facelist.Elem(new_loc),OF15x_owner_facelist.Elem(peek_loc));
new_loc = peek_loc;
}
peek_loc++;
}
continue;
}
@ -162,7 +224,7 @@ namespace netgen
// the index location to be used later by the neighbour list
OF15x_owner_celllist.Elem(owner_ind) = elind;
OF15x_owner_facelist.Elem(owner_ind) = locfaces.Elem(i);
// Set the bit array to indicate that the face is already processed
// Update the array to indicate that the face is already processed
ownerfaces.Elem(absfacenr) = owner_ind;
owner_ind++;
@ -192,7 +254,7 @@ namespace netgen
// Sort the list of surface elements in ascending order of boundary condition number
// also sort the cell list in the same manner
QuickSort(OF15x_surfelem_bclist,OF15x_surfelem_lists);
/*
int rng_start = 1;
int rng_end = 1;
@ -233,6 +295,7 @@ namespace netgen
rng_end = i;
}
}
*/
/*
ofstream dbg("OpenFOAMDebug.log");
@ -245,21 +308,14 @@ namespace netgen
<< " : cell = " << OF15x_surfelem_lists.Elem(i).I2() << "\n";
}
dbg << "\n ------- Owner List ------- \n";
dbg << "\n ------- Owner / Face / Neighbour List ------- \n";
for(int i = 1; i <= OF15x_owner_celllist.Size(); i++)
{
dbg << "Ind:" << i << " :: ("
<< OF15x_owner_celllist.Elem(i) << " "
<< OF15x_owner_facelist.Elem(i) << ")\n";
}
dbg << "\n ----- Neighbour List ----- \n";
for(int i = 1; i <= OF15x_neighbour_celllist.Size(); i++)
{
dbg << "Ind:" << i << " :: "
<< OF15x_neighbour_celllist.Elem(i) << "\n";
<< OF15x_owner_facelist.Elem(i) << " "
<< OF15x_neighbour_celllist.Elem(i) << ")\n";
}
dbg.close();
@ -366,6 +422,10 @@ namespace netgen
outfile << "(\n";
// Array to hold the indices of the points of each face to
// flip if required
Array<int> facepnts;
// Write the faces in the order specified in the owners lists of the
// internal cells and the boundary cells
for(int i = 1; i <= OF15x_owner_facelist.Size(); i++)
@ -373,13 +433,12 @@ namespace netgen
int face_w_orientation = OF15x_owner_facelist.Elem(i);
int facenr = abs(face_w_orientation);
Array<int> facepnts;
meshtopo.GetFaceVertices(facenr,facepnts);
// Get the orientation of the face, and invert it if required
// for a quad, inversion => swap 1 <=> 2 and 3 <=> 4
// for a trig, inversion => swap 1 <=> 3
// Since the faces already have the orientation "embedded" into
// them by means of the prepended sign, only this needs to be
// checked for...
if(face_w_orientation > 0)
{
int tmppnts = 0;
@ -412,18 +471,17 @@ namespace netgen
outfile << ")\n";
}
// Now append the faces of the surface elements (written in
// ascending order of boundary condition number) also into
// the faces file
for(int i = 1; i <= OF15x_surfelem_lists.Size(); i++)
{
int face_w_orientation = OF15x_surfelem_lists.Elem(i).I1();
int facenr = abs(face_w_orientation);
Array<int> facepnts;
meshtopo.GetFaceVertices(facenr,facepnts);
// Get the orientation of the face, and invert it if required
// for a quad, inversion => swap 1 <=> 2 and 3 <=> 4
// for a trig, inversion => swap 1 <=> 3
if(face_w_orientation > 0)
{
int tmppnts = 0;