There may be some cases in which you will need to read multiple mesh files (subdomains) to form your computational domain. Some examples are listed below:
Note that you do not need to ensure that the grid node locations are identical at the boundaries where two separate meshes meet; FLUENT can handle non-conformal grid interfaces. See Section 5.4 for details about non-conformal grid boundaries.
The procedure for reading multiple grid files is as follows:
!!If one (or more) of the grids you wish to import is structured (e.g., a FLUENT 4 grid file), you will need to first convert it to FLUENT format using the fl42seg filter described in Section 5.3.8.
See the TGrid User's Guide for information about reading and writing files in TGrid.
user@mymachine:>utility tmerge -2d Starting /Fluent.Inc/utility/tmerge2.1/ultra/tmerge_2d.2.1.13 Append 2D grid files. tmerge2D Fluent Inc, Version 2.1.11 Enter name of grid file (ENTER to continue) : my1.msh x,y scaling factor, eg. 1 1 : 1 1 x,y translation, eg. 0 1 : 0 0 rotation angle (deg), eg. 45 : 0 Enter name of grid file (ENTER to continue) : my2.msh x,y scaling factor, eg. 1 1 : 1 1 x,y translation, eg. 0 1 : 0 0 rotation angle (deg), eg. 45 : 0 Enter name of grid file (ENTER to continue) : <ENTER> Enter name of output file : final.msh Reading... node zone: id 1, ib 1, ie 1677, typ 1 node zone: id 2, ib 1678, ie 2169, typ 2 . . . done. Writing... 492 nodes, id 1, ib 1678, ie 2169, type 2. 1677 nodes, id 2, ib 1, ie 1677, type 1. . . . done. Appending done.
In the above example, where no scaling, translation, or rotation is requested, you could simplify the inputs to the following:
utility tmerge -2d -cl -p my1.msh my2.msh final.msh
For a conformal mesh, if you do not want a boundary between the adjacent cell zones, you can use the Fuse Face Zones panel to fuse the ``overlapping'' boundaries (see Section 5.7.7). The matching faces will be moved to a new zone with a boundary type of interior. If all faces on either or both of the original zones have been moved to the new zone, the original zone(s) will be discarded.
!!If you are planning to use sliding meshes, or if you have non-conformal boundaries between adjacent cell zones, you should not fuse the overlapping zones. You must instead change the type of the two overlapping zones to interface (as described in Section 5.4).