PRESSURE
I/O Options and Subcase Information Entry Used request displacement and pressure output for all subcases or individual subcases, respectively.
Displacement and pressure output is currently supported for Frequency Response Analysis and Darcy Flow Analysis.
Format
PRESSURE (sorting, format, form, rotations, type) = option
Definitions
Argument | Options | Description |
---|---|---|
sorting | <SORT1, SORT2> | This argument only applies to the PUNCH format
(.pch file) or the OUTPUT2
format (.op2 file) output for Frequency
Response Analysis subcases. It will be ignored without warning, if
used elsewhere.
|
format | <HM, H3D, OPTI, PUNCH, OP2, PATRAN, HG, APATRAN, PLOT, blank> |
|
form | <COMPLEX, REAL,
IMAG, PHASE,
BOTH> Default (HM only) = COMPLEX Default (all other formats) = REAL |
|
rotations | <ROTA, NOROTA> |
|
option | <YES, ALL,
NO, NONE,
SID> Default = ALL |
|
Comments
- When
PRESSURE
command is not present, displacement or pressure is not output for frequency response subcases. Similarly, nodal flow pressure output is disabled by default for Darcy Flow Analysis. Use of PRESSURE I/O Entry activates this output for nodal flow pressure in Darcy Flow. - PRESSURE I/O Entry can be used to output displacement and pressure for Frequency Response Analysis. Additionally, PRESSURE I/O Entry is used to output nodal flow pressure in Darcy Flow Analysis subcases. This output is currently only supported in H3D format. This is output as “Grid Pressure of Flow(s)” in H3D files and can be visualized in HyperView.
- The forms BOTH and COMPLEX do not apply to the .frf output files.
- Multiple formats are allowed on the same entry; these should be comma separated. If a format is not specified, this output control applies to all formats defined by the OUTPUT command, for which the result is available. Refer to Results Output for information on which results are available in which formats.
- Multiple instances of this card are allowed. If instances are conflicting, the last instance dominates.
- For optimization, the frequency of output to a given format is controlled by the I/O option OUTPUT. In previous version of OptiStruct, a combination of the I/O Options FORMAT and RESULTS were used; this method is still supported, but not recommended as it does not allow different frequencies for different formats.
- Rotation results are output in radians.
- In general, HyperView does not recognize the SORT2 format for results from the .op2 file. When results are output only in SORT2 format (<Result Keyword> (SORT2, OUTPUT2, ...)), the results are written by OptiStruct into the .op2 file in SORT2 format, but when the .op2 file is imported into HyperView, the results in SORT2 format are not recognized. Therefore, the SORT1 option is recommended for results output in OUTPUT2 format and SORT2 option is recommended for results output in PUNCH format.
- Results in binary format (.h3d or .op2) are always output in PHASE/MAG form, regardless of the options specified in the FORM field. The corresponding post-processors (HyperView/HyperGraph) can easily convert the PHASE/MAG format to the required formats. Results in ASCII formats are output in the specified/requested FORM.
- format=OUTPUT2 can also be used to request results to be output in the Nastran output2 format (.op2 file).