Q. In the ANSYS documentation, the help system states:
"Note: To import 2D and 3D region names into CFX-Pre, each such region must be defined with CMBLOCK commands when they are created in ANSYS."
But I didn't find that "cmblock" in ansys. Can you tell me more about where the CMBLOCK command is used?
A.
The named components that we referred to are not actually created with the CMBLOCK command. They are created in ANSYS using the CM command. E.g. CM,Inlete,ELEM, where "Inlete" is the name of the component. This will be what CFX-PRE sees.
Note that there is a bug in the initial release (fixed with the release of the first CFX-5.7 patch) where triangle faces are not read by CFX-PRE. The workaround for this is to use nodal components instead.
Here is some more information about CMBLOCK and the CDB file.
The ANSYS database is a binary file, and the ANSYS user desiring to use CFX will be creating 2D (for Boundary conditions) and 3D (for non-fluid regions) named components and writing them, along with the nodes and elements, to an ANSYS CDB file.
This ASCI version of the database is made by issuing CDWRITE. If you use the DB option on this command, the named components will be written to the CDB file. They are identified in the CDB file by a line with CMBLOCK. This line contains the named component name, what kind it is, and how many lines are to follow. The lines that follow for an element component would simply be element numbers in 8I10 format.
Now, what about the concept of a CMBLOCK "command"?
Well, it IS a command, but it is a command designed for use by the ANSYS CDREAD command. It was developed to speed up the reading of a CDB asci file so that the groups of lines could all be read in together rather than one at a time. So, in a way it is a "subcommand" of the CDREAD command.
An ANSYS user will never issue such a command. He/she would simply select the group of elements to be named and then name them something like
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Q. In the ANSYS documentation, the help system states: "Note: To import 2D and 3D region names into CFX-Pre, each such region must be defined with CMBLOCK commands when they are created in ANSYS." But I didn't find that "cmblock" in ansys. Can you tell me more about where the CMBLOCK command is used? A. The named components that we referred to are not actually created with the CMBLOCK command. They are created in ANSYS using the CM command. E.g. CM,Inlete,ELEM, where "Inlete" is the name of the component. This will be what CFX-PRE sees. Note that there is a bug in the initial release (fixed with the release of the first CFX-5.7 patch) where triangle faces are not read by CFX-PRE. The workaround for this is to use nodal components instead. Here is some more information about CMBLOCK and the CDB file. The ANSYS database is a binary file, and the ANSYS user desiring to use CFX will be creating 2D (for Boundary conditions) and 3D (for non-fluid regions) named components and writing them, along with the nodes and elements, to an ANSYS CDB file. This ASCI version of the database is made by issuing CDWRITE. If you use the DB option on this command, the named components will be written to the CDB file. They are identified in the CDB file by a line with CMBLOCK. This line contains the named component name, what kind it is, and how many lines are to follow. The lines that follow for an element component would simply be element numbers in 8I10 format. Now, what about the concept of a CMBLOCK "command"? Well, it IS a command, but it is a command designed for use by the ANSYS CDREAD command. It was developed to speed up the reading of a CDB asci file so that the groups of lines could all be read in together rather than one at a time. So, in a way it is a "subcommand" of the CDREAD command. An ANSYS user will never issue such a command. He/she would simply select the group of elements to be named and then name them something likeXSYM, or EINLET or whatever (as shown above with the CM command). After all is done they issue CDWRITE,TOAD,DB and they will get the file TOAD.CDB that CFX will happily read. |
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