public static double FaceWeightFactor(Element main, Element e,Face face)
{
double wf = 0;
Vector2 dcf = face.centroid - main.centroid;
Vector2 dff = e.centroid - face.centroid;
wf = (dcf * face.normal) / ((dcf +dff) * face.normal);
return wf;
}
/*
public void SetBoundary(int side, BoundaryType boundarytype, double value, double hcoeff = 0)
{
faces[side].SetBoundary(boundarytype, value, hcoeff);
}
*/
public int FaceLocalId(Face face)
{
for (int n = 0; n < faces.Length; n++)
{
if (faces[n] == face)
return n;
}
return -1;
}
public bool Create(string filename_)
{
double[,] points=null ;
double[,] polys = null;
double[,] bound = null;
Dictionary<string, Face> facedic = new Dictionary<string, Face>();
if (!LoadFromFile(filename_, ref points, ref polys, ref bound))
return false;
count = 0;
SetParameters();
elementcount = polys.GetLength(1);
int vertexcount = polys.GetLength(0)-1;
elements = new Element[elementcount];
int faceid = 0;
int e = 0;
for (e = 0; e < elementcount; e++)
{
Element elem;
elements[e] = new Element(vertexcount);
elem = elements[e]; elem.id = e; elem.k = 1;
Vector2[] vertex = new Vector2[vertexcount];
for (int v = 0; v < vertexcount; v++)
{
int pointindex = (int)polys[v, e];
vertex[v] = new Vector2(points[0, pointindex], points[1, pointindex]);
int p1index = pointindex;
int p2index = 0;
if (v < vertexcount - 1)
p2index = (int)polys[v + 1, e];
else
p2index = (int)polys[0, e];
int p1 = p1index;
int p2 = p2index;
string facestr =Face.GetFaceStrId(p1index,p2index);
if (!facedic.ContainsKey(facestr))
{
Face face = new Face(new Vector2(points[0, p1], points[1, p1]), new Vector2(points[0, p2], points[1, p2]));
face.id = faceid;
face.pointid1=p1;
face.pointid2=p2;
face.owner = elem;
faceid++;
facedic.Add(facestr, face);
elem.faces[v] = face;
}
else
{
Face face = facedic[facestr];
face.nbelem = elem;
elem.faces[v] = face;
Element owner = face.owner;
elem.nbs[v] = owner;
owner.nbs[owner.FaceLocalId(face)] = elem;
}
}
elem.SetPolygon(vertex);
elem.PreCalc();
}
faces = new Face[facedic.Count];
bndfaces = new Face[bound.GetLength(1)];
foreach (var pair in facedic)
{
Face face = pair.Value;
faces[face.id] = face;
}
for (e = 0; e < elementcount; e++)
elements[e].Calc();
int f;
for (f = 0; f < bound.GetLength(1); f++)
{
string facestr = Face.GetFaceStrId((int)bound[0, f], (int)bound[1, f]);
Face face = facedic[facestr];
face.bnddomain = (int)bound[5, f];
face.bndgroup = (int)bound[4, f];
face.isboundary = true;
bndfaces[f]=face;
}
SetInitialBoundary();
// for (e = 0; e < elementcount; e++)
// elements[e].CalcFluxes();
return true;
}
public static double FaceWeightFactorSimple(Element main, Element e, Face face)
{
double wf = main.volume / (main.volume + e.volume);
return wf;
}
// only one face between two nodes, first node is face owner
void CreateFaces()
{
int nf = 0;
for (nf = 0; nf < vertex.Length; nf++)
{
if (faces[nf] == null)
{
if(nf==vertex.Length-1)
faces[nf] = new Face(vertex[nf], vertex[0]);
else
faces[nf] = new Face(vertex[nf], vertex[nf+1]);
faces[nf].owner = this;
if (nbs[nf] != null)
faces[nf].nbelem = nbs[nf];
}
}
}
// -------------------- COMPUTE ---------------------------------
// -------------------- COMPUTE ---------------------------------
public void Calc()
{
double bc, ac;
double flux;
double sumflux;
double[] aa = new double[3];
double[] bb = new double[3];
int e;
int iter = 0;
for (iter = 0; iter < 225; iter++)
{
for (e = 0; e < elementcount; e++)
{
Element elem = elements[e];
int nf;
bc = 0;
ac = 0;
sumflux = 0;
flux = 0;
aa[0] = 0;
aa[1] = 0;
aa[2] = 0;
bb[0] = 0;
bb[1] = 0;
bb[2] = 0;
for (nf = 0; nf < Element.FACEMAX; nf++)
{
Face face = elem.faces[nf];
Element nb = elem.nbs[nf];
// int nw = elem.facenormals[FaceType.WEST];
// int ne = elem.facenormals[FaceType.EAST];
// fluxV = 0;
if (face.isboundary)
{
if (face.boundaryType == BoundaryType.BND_CONST)
{
flux = face.k * (face.area / elem.nodedistances[nf]);
ac += flux;
bc += flux * face.bndu;
bb[nf] = flux;
}
else if (face.boundaryType == BoundaryType.BND_FLUX)
{
double sf = face.area;
flux = face.bndflux * sf;
bc += flux;
bb[nf] = flux;
}
}
else
{
flux = -face.k * (face.area / elem.nodedistances[nf]);
sumflux += flux * nb.u;
ac += -flux;
aa[nf] = -flux;
}
}
for (int ii = 0; ii < 3; ii++)
{
aa[ii] = aa[ii] / Math.Sqrt(3);
bb[ii] = bb[ii] / Math.Sqrt(3);
}
double acc = ac / Math.Sqrt(3);
double bcc = bc / Math.Sqrt(3);
elem.u = (bc - sumflux) / ac;
}
}
}