|Type of mesh
||multiblock structured and unstructured
||2D and 3D
The translator creates the grid data in the format of CFDRC's Data Tranfer
Facility (DTF library version 7.2). It supports both structured and
unstructured grids in 2- and 3-D. The grid file can be written in single
(default) or double precision.
The .DTF file contains the following information:
NODE LIST: x, y, z coordinates of all nodes
For structured meshes, the "blanking" information. The supported iblank
1 : normal fluid nodes
2 : solid wall boundary
-n = space continues on block n.
Boundary condition locations and boundary condition type
Cell type information
For unstructured meshes: Cell-to-node connectivity array. The cells
are output in groups of the same type. In 2D, all quadrilaterals are first
listed, then all the triangles. In 3D, the cell groups are written in the
following order: hexahera, tetrahedra, prisms and pyramids.
For unstructured meshes: Boundary and interface face-to-node connectivity
arrays, and database key number. In 2D, the faces are bar elements (2-nodes).
In 3D, the triangular faces are written first, then all the quadrilateral
faces. The key number links the face to the appropriate attributes.
Creating the DTF input files
The translator writes the DTF grid file using the selected unstructured or
structured mesh, the boundary conditions file and, if structured, the
topology file. To create the DTF file, "Select
solver" → CFDRC-DTF in the
"Output" menu. After clicking "Write input
" you can specify the following options for the DTF interface:
The interface generates the DTF mesh file located in the project
Select the type of mesh, unstructured or structured. Note: if structured,
a domain selection window will follow this window, allowing one to select the
structured domains to be written into the DTF input.
If unstructured, selected the unstructured domain name.
If structured, give the name of the topology file
Give the name of the boundary condition file
option to create the grid file in double precision
option to write out structured blocks with indices in decreasing dimension.
give the name of the DTF file (default is project.DTF)
Defining Boundary and Volume Conditions
To define boundary and volume condition click on the "BC" icon
in the "Output" menu. Supported
boundary condition types for solver CFDRC-DTF are: