THIST command for time history results output at a high frequency.
Hyperworks Tips & Tricks
OptiStruct – THIST command
Topic description: In version 2022.1, OptiStruct adds the THIST command for time history results output at a high frequency in hdf5 format. THIST is currently only supported for Explicit Dynamic Analysis (ANALYSIS = NLEXPL).
General Overview
In some situations, a subset of results (for example, displacement, force, etc.) is required to be output at a high output frequency. But increasing output frequency in NLOUT would affect all results, leading to enormous file size and this may be undesired. THIST card is a useful and effective solution for such cases. By default, the THIST result file name is <input deck name>_TH.h5, which will be supported by HyperGraph v2022.2 (if you want to access it earlier, please contact Altair support via email hwsupport@altair.com ). The global energy results are always output to _TH.h5 by default.
Example
An example of THIST usage is displayed below. It will output the global energy results, the displacement, velocity, and SPC force for the grid 27,28,29 into <input deck name>_TH.h5 file every 0.001 second.
The input deck:
For more information and to access the Altair OptiStruct THIST card help, please navigate to Help > OptiStruct > Reference Guide > Input Data > Bulk Data Section > THIST.