CDH/OPTRAN V6.0

Dear OPTRAN user,

We are pleased to inform you that CDH/OPTRAN Version 6.0 is now available.

The latest CDH/OPTRAN release version offers the following new features and corrections:

1. New Feature Fluid Point Loads:
Fluid point loads are now supported with the FPOINTLOAD entry mentioned in the attached document. 

2. New Feature Element Sensitivity:
Element sensitivity calculations are now supported.  See the usage manual for equations for Element Sensitivity computations. For usage, please refer to attached document.

3. Enhancements:

• Added support for MSC Nastran 2024.1 and 2024.2 
• Support for AMLS5.3r262 and FastFRS2.3r262 (incl. GPU capability) 
• Output of separate “violation csv file” in case of request line „output violation“ written in request file. 
• New command line keyword “NASTBPOOL” allows changing Nastran buffer pool memory size for the Nastran part of the OPTRAN run 
• New command line keyword “NGPU” specifies the number of GPU boards for AMLS and FastFRS. NGPU must be a positive integer. An AMLS and FastFRS GPU enabled licence is required to use GPU boards 
• New command line keyword “NCPU” specifies the number of processors for AMLS, FastFRS and OPTRAN. The existing equivalent keyword ‘PARALLEL’ will be deprecated in a near future version. 
• Default change: When peaks are chosen in presence of targets (equivalently, the dynamic choice of frequencies at which operational shapes and such are made), the % violation has been used as the criterion on which the violations are ordered and peaks are chosen. The default is now being changed to the absolute violation.
• “OPTRAN elapsed TIME SUMMARY” is output at the end of the optran.log file. This gives an overview of the calculation time.

4. Bug-Fixes:

• SDISP output to csv in case forcing frequencies varied between subcases was incorrect and has been fixed 
• Correct parameters now output (out code) for FastFRS in case of B2PP, K2PP for optimized FastFRS performance 
• Include files of request file not always respected has been fixed 
• Incorrect ordering of peaks in _peaks.csv file in case of a negative target is fixed
• Corrected missing output of fluid mode shapes to op2 of type “x”, in case “output csv” was requested at the same time.  
• Autorequest for RANDOM was fixed to account for the fact thatNastran RANDOM case control can reference a set or a RANDPS entry directly. Previous versions do not calculate PSDF if RANDOM points to a RANDPS ID. 
• Request file is unable to support ‘include’ for crlf line feed code file has been fixed

5. Supported Nastran versions and CDH Software:

MSC.Nastran
MSC.Nastran Version 2018.2, 2019.0, 2020.1, 2021.4, 2022.3, 2022.4, 2023.4, 2024.1, 2024.2

CDH Software
CDH/AMLS Version 5.3 r262
CDH/FastFRS Version 2.3 r262

Operating System
RHEL/Rocky 8+

6. Cautions – end of support warnings:

• In future releases only the latest sub-version of older Nastran releases will be supported by OPTRAN. For example, for MSC 2022.1 – 2022.4, only the latest sub-version MSC 2022.4 will officially be supported. Please upgrade to these Nastran versions accordingly.
• This is the last OPTRAN release that officially supports MSC Nastran 2018.2, 2019, 2020.1 and 2021.4 by default.

Download Link:
https://cloud.cdh-ag.com/index.php/s/zyzGZg8rkpjsB7f

Please contact us to receive the password.
If you have any questions or need assistance, please contact support@cdh-ag.com.