CDH/OPTRAN V6.1

Dear OPTRAN user,

We are pleased to inform you that CDH/OPTRAN Version 6.1 is now available.

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

1. Enhancements:

• Added support for MSC Nastran 2025.1
• Support for Element Sensitivity of 3-D solid elements including 2nd order element with mid-side nodes using ESENS commands
• Support for dynamically requested Element Sensitivity computations
• PSD loading now computes auto-spectrum of 1-D element forces
• Allow CDH/OPTRAN default file to specify Element Sensitivity parameters
• Ranking info in peak csv file – Panel name and mode number added
• Allow specification of a single element ID on the ELFORCE request line

2. Bug-Fixes:

• Fix for very large models (64K structure modes, 5K fluid modes) for SGPPF computations
• Reduction in memory needed during Optran phase 1 for B2PP with FastFRS symmetric option
• SMPF argand diagrams of type png were incorrectly scaled in case of ranking method “PROJ”

3. Supported Nastran versions and CDH Software:

MSC.Nastran
MSC Nastran Versions 2021.4, 2022.3, 2022.4, 2023.4, 2024.1, 2024.2, 2025.1

CDH Software
CDH/AMLS Version 5.3 r274
CDH/FastFRS Version 2.3 r274

Operating System
RHEL/Rocky 8+

4. 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 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.