CDH-AG

CDH/AMLS 5.3 and CDH/FastFRS 2.3 (revision 274)

Dear AMLS/FastFRS user,

we are pleased to inform you that CDH/AMLS version 5.3 and CDH/FastFRS version 2.3 (revision 274)  is now available.

1. CDH/AMLS

Cautions:

  • For AMLS 5.3, FlexLM daemon v11.19.5.0 and an AMLS version 5.3 specific license file are required. Both the updated daemon and license file are fully backward compatible with legacy AMLS 5.2 versions. Please see the installation manual for detailed instructions.
  • Starting from AMLS 5.3 the installation package available from CDH Cloud includes all AMLS executables, delivery databases (DDBs), FlexLM daemon, manuals and demonstration examples. For some users, this change might require slight adjustment of their existing installation procedures, but the fundamentals of how to install and use AMLS remain the same. Please refer to the updated AMLS 5.3 installation guide for instructions.
  • The AMLS-Nastran user parameter SS2GCR and SS2GCRF in AMLS 5.2 are outdated and have been replaced in AMLS 5.3 by new parameters AMLSACC and AMLSFACC. Please refer to the AMLS user manual for detailed instructions.
  • For MSC-Nastran, the AMLS parameter DISJOINF should now be used to allow multiple disconnected fluid meshes. For multiple structural meshes the corresponding parameter continues to be DISJOINT.

Enhancements version 5.3.r274 (compared to 5.3.r262):

  • Enhanced GPU feature to improve AMLS performance for large models and higher frequency analyses.
  • Added user parameter AMLSNGPU to specify the maximum number of GPU boards to use. 
  • Added DDB support for MSC-Nastran 2025.1. 
  • Added DDB support for Simcenter/NX-Nastran 2506. 
  • Improved handling of the Nastran ISHELL “DOIT” error for NX-Nastran. 
  • Added support for frequency-dependent structural materials (MAT1F) in NX-Nastran
  • Improved support for MPCFORCE output/response requests. 
  • Improved AMLSCMP support for EXTSEOUT superelement for models including both structure and fluid (MSC-Nastran only). 
  • Improved warning and error messages in f06 in case of AMLS license or installation issues. 
  • Improved handling of small models to reduce calculation times 
  • Improved handling of residual vectors in certain small structural models 
  • Several minor enhancements and bug fixes.

2. CDH/FastFRS

Enhancements version 2.3.r274 (compared to 2.3.r262):

  • Enhanced GPU feature to increase FastFRS performance for very large models and analyses with many modes (e.g. plastic parts and / or high- frequency simulations).
  • Added user parameter FFRSNGPU to specify the maximum number of GPU boards to use.
  • Improved support for PARAM, CSVEIGV output for fluid-only models
  • Improved automated generation of DMIG input file for the step-1 run for FRF substructuring.
  • General minor bug fixes.

Supported GPU Boards

AMLS and FastFRS support the use of high-end Nvidia GPUs in their calculations.

This is especially useful for large scale analysis with many modes. Supported GPU boards include Nvidia A100, H100, H200 (or newer) with 80GB of memory or more. Please contact CDH support in case of interest in a GPU trial license.

Nastran Delivery Data Bases (DDB)

In this release the DDB for the following versions of Nastran are available:

MSC:    2021.4, 2022.4, 2023.1, 2023.2, 2023.3, 2023.4, 2024.1, 2024.2, 2025.1
NX/SC: 2021.2, 2212, 2306, 2312, 2406, 2412, 2506

CAUTION: All DDBs in this release should only be used with version 5.3.r274 of the AMLS executables. 

Nastran Delivery Data Bases (DDB) for Advanced Acoustic Solver Interface (AASI)

CDH Advanced Acoustic Solver Interface (AASI) is a new special DDB which offers a number of more advanced features compared to the standard AMLS DDBs.  The current release includes the following features:

  • CDH/AASI-PEM is a new AMLS/FastFRS based interface to efficiently solve acoustic simulations containing porous elastic materials (PEM) from MSC Nastran/ACTRAN.
  • CDH/AASI-FastPPF is a new highly efficient algorithm for computing Panel Participation Factors (PPF).
  • CDH/AASI-MonteCarlo is a new highly efficient implementation of Monte-Carlo simulations using a non-parametric method (NPVM).

NOTE: Use of AASI DDB requires a CDH/AASI license additional to AMLS/FastFRS license.

Key advantages of CDH/AASI

  • Up to 10 times reduced computation time compared to MSC Nastran (FastPPF)
  • Significantly lower disk space resource requirements
  • Improved stability and performance of AASI for high frequency analysis

Download Link:

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

Contact Person: Anita Claus
Telephone:  
E-Mail: