Unstruct2D  1.0
Solution of 2-D Euler- and Navier-Stokes Equations on Unstructured Grids
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modgeometry Module Reference

Variables related to grid geometry and topology.

Public Attributes

integer nnodes
 number of grid nodes (including dummy nodes)
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integer nndint
 number of physical grid nodes (nnodes - dummy nodes)
 
integer ntria
 number of triangles
 
integer nsegs
 number of boundary segments (composed of boundary faces)
 
integer nbfaces
 number of all boundary faces
 
integer nbnodes
 total number of boundary nodes
 
character(chrlen), dimension(:),
allocatable 		bname
 names of boundary segments (used for plots)
 
integer, dimension(:), allocatable btype
 types of boundary conditions:
100-199 = inflow
200-299 = outflow
300-399 = viscous wall
400-499 = inviscid wall
500-599 = symmetry line
600-699 = far-field
700-799 = periodic boundary
 
integer, dimension(:,:),
allocatable 		bface
 indexes of two nodes defining a face (NOT used for periodic boundaries!)
 
integer, dimension(:,:),
allocatable 		bnode
 data related to boundary nodes
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integer, dimension(:,:),
allocatable 		ibound
 pointer from boundary segment to boundary faces and nodes
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real(rtype) xref
 x-coordinate of the reference point
 
real(rtype) yref
 y-coordinate of the reference point
 
real(rtype) cref
 reference length or airfoil chord
 
integer, dimension(:,:),
allocatable 		tria
 node indexes of triangle elements
 
real(rtype), dimension(:),
allocatable 		x
 x-coordinates of grid points
 
real(rtype), dimension(:),
allocatable 		y
 y-coordinates of grid points
 
real(rtype), dimension(:,:),
allocatable 		sij
 x,y-components of the face vector (n*dS)
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real(rtype), dimension(:),
allocatable 		vol
 median-dual control volume (shaded area in Fig. 5.8)
 
real(rtype), dimension(:,:),
allocatable 		sbf
 normal vector of boundary face (outward pointing, size equal to the edge length); defined for all boundaries except for periodic ones
 
real(rtype), dimension(:,:),
allocatable 		sproj
 projections of control volumes on the x- and y-axis (used to compute the time step - see Eq. (6.22))
 

Member Data Documentation

integer, dimension(:,:), allocatable modgeometry::bnode

Meaning of the entries:

  • (1,*) = index of the node itself
  • (2,*) = index of the related dummy node (inlet, outlet, far-field) or of the other periodic node; otherwise = -777
  • (3,*) = index of edge to the dummy node (edge(*,ie), ie > nedint)
integer, dimension(:,:), allocatable modgeometry::ibound

Meaning of the entries:

integer modgeometry::nnodes

Dummy nodes are defined for inlet, outlet and far-field boundaries only. The variables cv(), dv(), x(), y(), edge() and sij() are divided into two parts. The first part is related to the physical grid (dimensions nndint, nedint). The second part refers to the dummy nodes. This approach makes it easier to loop either only over the physical grid nodes (edges), or over all nodes (edges) using the same vector.

real(rtype), dimension(:,:), allocatable modgeometry::sij

For ie > nedint, sij(*,ie) represents the average face vector at a boundary node (face between boundary and dummy node); sij() always points from node i to node j (see Fig. 5.9).

The documentation for this module was generated from the following file: