New UH3D interface
This new ICEM CFD/CAE UH3D interface uses a cartesian grid created with
the GLOBAL-Mesher. It writes two files, a grid file (filename.grd)
and a geometry file (filename.geom). The grid file contains the
description of the cartesian grid i.e. the number of stations in each directions
and the coordinates of these stations. The geometry file contains information
about the geometry inside the cartesian grid. It is divided in three sections:
The geometry-grid intersections table defines for each intersection:
the coordinates of the intersection point
what general direction the geometry points along the intersecting Cartesian
the component number of the geometry at the intersection point
The component table contains the component name for each component number
used in the previous section.
The boundary conditions defined on the components.
One have also the option to use an unstructured domain as input. In that
case, if no cartesian grid is available, pierce points are ignored and
no grid file will be written, and the components refer to the families.
But if the cartesian grid exits, along with the unstructured domain, an
unstructured grid is
Creating the UH3D Input Files
Prior to running the UH3D interface, a special file must be written from
the GLOBAL-Mesher, if an unstructured domain file is not used. This file
contains the information necessary to write the UH3D input files. To create
this file, type the following command in the "Message Window" of the GLOBAL-GUI:
uh3d filename material#1 material#2 ... material#n
This creates the file filename
in the same directory where icemcfd
was started. Please note that the material numbers correspond to the volume
families and are displayed in the "Message Window" when the different volume
families are turned on or off.
The translator writes the UH3D input files using this special grid file
created in GLOBAL-Mesher, and its corresponding boundary conditions file.
To create the UH3D input files, select the translator "UH3D" in the "Output"
menu from the ICEM CFD/CAE Manager. After clicking "UH3D input" you can
specify options for the UH3D interface:
specify if an unstructured grid is used as input (no *.grd written)
give the name of the grid file created in the GLOBAL-Mesher (filename)
, if no unstructured input domain used
give the name of the boundary condition file
give the suffix for the UH3D input files
specify if an unstructured mesh should be written out, if a global mesh
is used as input
give the name of the unstructured grid file, if needed
The interface generates the UH3D grid file in the Transfer Shell. You may
open a shell window in this directory by selecting the menu items "Utility"
and "Transfer Shell".
Defining boundary conditions for UH3D
Boundary conditions can be defined on each surface family (component) of
the geometry. Two types of boundary conditions are available, the temperature
(C) and the heat flux (W/m^2). The boundary condition type is defined under
and the boundary condition value under real1
in the "general bnd
cond." menu of the DDN-Mesher Interface or the Output/Bound conds menu
in the mesh editor (MED). Please refer to the
section for more details.
1.string1 Enter the word TEMP or HEAT
3.real1 Enter the value of the temperature or heat flux.
Old UH3D interface
The translator follows 2 steps to create a UH3D grid file.
Step 1: It generates a Patran neutral file from an unstructured domain
file. The Patran neutral file contains only coordinates and triangle element
definitions. The input of this conversion is either an unstructured domainfile
from ICEM CFD/CAE TETRA or structured domainfiles, which are automatically
converted to an unstructured domainfile (triangle surface mesh).
Step 2: The Patran neutral file is input to a GPL program, which is automatically
called by the interface. Within the GPL program the user can define and
write the coordinates for the UH3D grid file.
The interface does not support boundary conditions. The supported information
is the nodes and the triangular elements.