RTT Interface

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The ICEM-CFD/RTT translator creates the input file necessary to run the RTT solver writing one formatted file, whose default is rtt.mesh.

Creating the RTT Input Files

The translator writes the RTT input files using an unstructured domain file and its corresponding
boundary conditions file. To create the RTT input file, select the translator "RTT" in the "Output" menu from the ICEM CFD/CAE Manager. After clicking "Write output" you can specify options for the  interface: The interface generates the RTT files 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 RTT

The boundary groups are defined by assigning a name to the external surfaces of the model.  Generated with the HEXA-mesher, the "node flag type," "side flag type" and "cell flag type" are defined under string1 in the
"general bnd. cond." menu of the DDN-Mesher interface, and the respective "node_flag,"  "side_flag" and "cell_flag" under string2.  Please note that the string1 and string2 variables are limited to five (5) characters each.  The flag_location (i.e., on the nodes, sides or cell of the region selected) must be specified in integer. The assignments are as follows, so it necessary only to modify the field from its default zero if the flag is a "node_flag", or if you want to specify that the internal faces of a surface family be written (in which case you should enter "-1" for the location):
 
flag_location
integer
node
1
side
0
cell
0
internal face
-1
Additionally, the user defined non-zero "flag_index" for each flag can be specified in real1, in the same "general bnd. cond." menu.
 
MULCAD HEXA/TETRA/LEO  define...
 1. FLAG 1. string1 Enter  the flag type
12.ATTRIBUT 2. string2 Enter the flag
3. VALUE 3. integer Enter the flag_location
4.  A 4. real1 Enter the index value (integer) 
for this flag
Please refer to the General Remarks section for more details on defining boundary conditions.

Limitations

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