NACS 2.6 is available

We are happy to announce the availability of NACS 2.6.

NACS 2.6 is a feature release that mainly enhances the functionality of NACS and partly removes some bugs.

Bugs were mainly removed from the graphical user interface but also from the NACS core itself.
The bugfixes in NACS concern simulations using nonconforming mesh interfaces as listed below.

The NACS GUI now offers dialogs that allow to define model order reduction methods that have been implemented and enhanced. Besides that harmonic simulations can now benefit from defining simulation frequencies as list with arbitrary entries.

Feature Highlights

NACS Core Features

Model Order Reduction: Modal Superposition
NACS 2.6 arrives with support for model order reduction methods. One of these reduction methods is Modal Superposition. The following analysis types can benefit from this method:
  • transient analysis
  • harmonic analysis
The Modal Superposition model order reduction can currently be applied to and accelerates the computation of the following physics:
  • Mechanics
  • Piezoelectricity
In order to be able to use this feature, which is currently available as beta feature,a new license is required. We offer this new license type as test license to existing and new users. Just contact us at This email address is being protected from spambots. You need JavaScript enabled to view it. .
Model Order Reduction: Krylov Reduction
NACS 2.6 arrives with support for model order reduction methods. One of these reduction methods is Krylov Subspace Reduction. The following analysis types can benefit from this method:
  • transient analysis
  • harmonic analysis
The Krylov model order reduction can currently be applied to and accelerates the computation of the following physics:
  • Mechanics
  • Magnetics
  • Magneto-mechanics
In order to be able to use this feature, which is currently available as beta feature,a new license is required. We offer this new license type as test license to existing and new users. Just contact us at This email address is being protected from spambots. You need JavaScript enabled to view it. .
Acoustics: Flow Velocity Boundary Condition from External Data
The Flow Velocity boundary condition in the Acoustic physic can now use the flow field from an external source such as the result of a CFD simulation.
Mechanics – New Surface-Normal Results
The following new results were added in NACS 2.6, which are mapped onto a surface by projection onto the surface’s normal vector:
  • Normal Displacement
  • Normal Velocity
  • Normal Acceleration
  • Normal Stress
  • Displaced Volume (net volume displaced by a moving surface)
  • Acoustic Sound Pressure (using a plane wave assumption - only applies to weak coupling)
Harmonic Analysis: Frequency List
The frequencies computed in a harmonic analysis can now be given as a list in Python scripting. This is an alternative to defining a harmonic analysis by a frequency range.

NACS Core Bugfixes

Some bugs reported by customers or identified by our own staff could be fixed. Please review the main bugfixes listed below:

Non-Conforming Mesh Interfaces: different approximation orders
Using a Nitsche-type non-conforming mesh interface to connect two mechanical parts with different approximation order could lead to a too stiff behavior of the parts and unphysical mode shapes.
Non-Conforming Mesh Interfaces: modified default Nitsche factor
The default penalty factor of 100 for Nitsche-type could lead to a too stiff coupling between mechanical parts.
The default penalty factor was reduced to 20.

NACS GUI Features

NACS 2.6 benefits from some GUI enhancements which will be described in the following sections.

Magnetics: Coil Boundary Condition
In the boundary conditions dialog introduced in NACS 2.5 a bug prevented that coil parts could be defined since the region list was not updated. This has been fixed in NACS 2.6.
Mechanics: CME Boundary Condition
In NACS 2.5 concentrated mechanical element boundary conditions could not be saved. This bug was fixed in NACS 2.6.
Harmonic Analysis: New sampling type Frequency List
NACS 2.6 offers the possibility to carry out harmonic simulations on arbitrary frequency lists.
This allows users to define several frequency ranges in just one analysis step.
Model Order Reduction: Modal Superposition
The setup of a Modal Superposition model order reduction can be carried out in NACS 2.6 GUI with only a few steps.
The existing modal result file has to be specified and the user may, but does not need to, define some criteria to select relevant mode shapes in a seperate mode shape selection dialog.
All settings are carried out in the analysis setting dialog.
Model Order Reduction: Krylov Subspace
Krylov Subspace model order reductions can be activated by just providing the number of Krylov vectors that will form the base for the reduced order model.
All settings are carried out in the analysis setting dialog.

Download

The current NACS Version be downloaded from our website by all registered users.

Release Notes on Youtube

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