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What is the ANSYS Software Package?

The ANSYS Software Package is an engineering and scientific software suite applicable for the simulation of computational fluid dynamics (CFD), acoustics, computational structural mechanics (CSM), electro-magnetics (EMAG), thermodynamics and many more applications. The different ANSYS simulation tools and applications can be accessed either via the ANSYS Workbench GUI, the GUI's of standalone applications like ANSYS CFX or ANSYS Fluent and through command line interfaces, e.g. in so-called batch mode on the Linux Cluster and SuperMUC-NG. Furthermore the ANSYS Software Package includes the Postprocessing Tools CFD-Post and ANSYS Ensight.

With a separate installation package ANSYS distributes the ANSYS EM (EM=Electro-Magnetics) applications with their own integrative platform ANSYS Electronics Desktop (ansysedt). Currently at LRZ both Maxwell-2D/-3D (simulation of static electro-magnetic fields) as well as HFSS (propagation of low and high frequency electro-magnetic waves) are provided for parallel simulations on LRZ Linux Clusters. This parallelization approach based on the SLURM scheduler is still in a testing phase.

Software Producer

ANSYS, Inc.
Southpointe
275 Technology Drive
Canonsburg, PA 15317
Telephone: (724) 746-3304

Software Vendor and Channel Partner

CADFEM GmbH
Marktplatz 2 85567 Grafing
Tel.: 08092/7005-0
Fax: 08092/7005-77
Email:
General information:         info@cadfem.de
Information on seminars:  seminar@cadfem.de

The ANSYS Applications

Licensing

The Leibniz Supercomputing Center (LRZ) provides access to the ANSYS Software, which is limited by the number of concurrently available software licenses as well as by the terms and conditions for the usage of the ANSYS Academic Research Licenses. These licenses may only be used for research and teaching by the institutes of the Bavarian Academy of Sciences and the Munich Universities, i.e. TUM, LMU, HM. The licenses allow only the use of ANSYS products for non-commercial purposes.

At this point students are adviced to use the freely available Free ANSYS Student Software edition wherever applicable. This free student software product can be downloaded from the ANSYS website and provides access to most of the ANSYS software products with some limitations on node/element/cell counts in the simulation models.

ANSYS Academic Teaching licenses are provided in the Munich Scientific Network (MWN) free of charge. A user registration is not required in order to use the ANSYS Academic Teaching licenses, which are part of the ANSYS campus license hold by LRZ. The ANSYS Academic Teaching license is causing similar limitations to the usage of the ANSYS products as the Free ANSYS Students product. The difference is the full availability of all ANSYS products in the software installation, which are included in the full ANSYS Academic Research license as well (see the table below). Examples ar the mesh generation tool ICEM/CFD Hexa/Tetra and the ANSYS Electronics products which are available with the ANSYS Academic Teaching license, but not with the Free ANSYS Students Software.
In case of difficulties with the ANSYS Software installation from the provided LRZ installation resourses and in using the ANSYS Academic Teaching licenses within the MWN network, please read the following troubleshooting document first, before you are submitting an LRZ Service Request.

The LRZ is providing full capability ANSYS Academic Research Multiphysics licenses and a larger number of High performance Computing (HPC) licenses free of charge for the usage on LRZ linux Clusters, supercomputers and Remote Visualization Systems (RVS). For academic research purposes on local compute resources the institutions of the Munich Universities (TUM, LMU, HM) can purchase ANSYS Academic Research licenses from the LRZ pool of an ANSYS Campus license. Further information on ANSYS software licensing at LRZ is available here. Additional licenses purchased and owned by other institutions or university departments and which are aimed for use at the LRZ Linux clusters and supercomputers can be hosted at LRZ (license server hosting).

Important Note:
Prior to use the ANSYS Software on any LRZ computer system you need to register with LRZ user support
in order to obtain an entry of your LRZ user-ID in the ANSYS license server operated and managed by LRZ. Only afterwards a user will be aible to checkout a license for any of the ANSYS software applications from the LRZ license server. Granted access to LRZ Linux Cluster and/or SuperMUC-NG does not automatically imply a granted access to any licensed software. Access to licensed software is granted on individual request!

For local installation of the software please consult our software download page. To access this site you need a password that you will receive by contacting the LRZ user support. Furthermore, the most contemporary version of the ANSYS software (Windows, Linux) can be downloaded directly from the ANSYS Customer Portal after registering with ANSYS, Inc. as a software user.

License Preference Settings

ANSYS allows users to make there license preference settings prior to start any of the ANSYS applications by using the following ANSYS license administration GUI, e.g. on a Linux Cluster login node:

Either:
=======
> module load cfx
> anslic_admin

Or:
===
> module load fluent
> anslic_admin

in order to adjust their license preference settings. In the GUI under the menue option "Set License Preferences for User XXXXXX" is an overview provided over the different ANSYS software versions and available licenses. You can set your prefered usage profile there. Please note, that the license preferences are ANSYS version specific, i.e. they have to be specified and adjusted for each individual ANSYS version.

Remark for ANSYS CFD Users:
LRZ would like to ask users with applications requiring less than 512.000 mesh cells to adjust there license preferences by moving the license type "ANSYS Academic Teaching Mechanical and CFD" to the very top of their license stack, in particular before the "ANSYS Academic Research CFD" and "ANSYS Academic Research Mechanical and CFD". By doing so you can make other ANSYS software users at LRZ who are waiting for an Academic Research License a very big favour, since your application does not require the usage (and blockage) of a full and unlimited ANSYS Academic Research License.
Thank you all for your kind collaboration!

ANSYS Free Students Edition vs. ANSYS Academic Teaching & Research Campus Version

In the past we have occasionally observed confusion with the licensing of the ANSYS software at LRZ, if prior to the use of the LRZ internal ANSYS license server a local installation of the ANSYS Free Students Edition was involved. The issue here is, that the ANSYS Free Students Edition comes with a locally installed ANSYS Students license, which interferes with any later attempt to specify a different source for ANSYS licenses like the ANSYS license server provided by the LRZ.

Thereby we strictly recommend, not to install the ANSYS Free Students Edition and the ANSYS full software product on one and the same computer. Prior to upgrading the local computer from a previously installed ANSYS Free Students Edition to the full product, the students version of the product needs to be entirely uninstalled including the licensing software components in the path C:\Program Files\ANSYS Inc\Shared Files. It is recommended to entirely delete (or at least rename) this folder after the complete uninstall of the ANSYS Free Students Edition and prior to the installation of the full software product, where the ANSYS license server at LRZ can be specified as the corresponding ANSYS license resource. 

Essentially one need to distinguish between the following four license types (mainly focussing here on ANSYS CFD and ANSYS Mechanical), which are inter-linked with the corresponding software installation and applying specific software limitations. All ANSYS software licenses are subject to the governing ANSYS licensing terms & conditions. All information in the following table is given with absolutely no warranty and is subject to change by ANSYS Inc. in any future version of the software, so that the following information is provided here for ANSYS 19.2 release to our best knowledge:

TopicANSYS Free Students EditionANSYS Academic Teaching Mechanical & CFD & EMANSYS Academic Research CFDANSYS Academic Research Mechanical & CFD & EM
Software InstallationSpecifically provided ANSYS Students Edition software package (https://www.ansys.com/de-de/academic/free-student-products)Standard ANSYS software installation as provided on computer systems at LRZ (ANSYS Installation packages available through the ANSYS Customer Portal: https://support.ansys.com/AnsysCustomerPortal/en_us)
Known Limitations in the Software InstallationDoes not contain some applications, which are judged as "expert applications". The most prominent in this list is the lack of an ICEM/CFD Hexa & Tetra Meshing installation in this product version. CAD import filter, LSDYNA, FORTE, HFSS and Maxwell-3d not included as well. I.e. this software installation differs from the full ANSYS product by number and type of installed applications.Full installation of the ANSYS software package. ANSYS EM software products are not part of the standard installation package, but are distributed as a 2nd and separate installation package.
Included parallel licensesrun on <=4 CPU cores, no HPCbuild-in: <=4 CPU cores
+ can be extended by HPC
run on 16 CPU cores + HPCrun on 16 CPU cores + HPC
Limitations for geometry modeling<300 faces and 50 bodies in the build geometryno known limitationno limitationno limitation
Limitations to mesh cell count in an ANSYS CFD application (CFX, Fluent, AIM)<512.000 mesh cells/nodes<512.000 mesh cells/nodesno limitationsno limitations
Limitations to (nodes + elements) count in an ANSYS Mechanical application (Workbench, APDL)<32.000 (nodes + elements)<256.000 (nodes + elements)no limitationsno limitations
Limitations to nodes / elements in ANSYS EM solutionsnot includedlow frequency <512.000
high frequency < 1 Mill.
-no limitations
License Feature Name(aa_t_i  ??)aa_t_aaa_r_cfdaa_r
License Availabilityfree & local,
comes together with the Software Installation Package
1250 (+250),
part of the LRZ Campus License

0 (35);
hosted licenses

125;
part of the LRZ Campus License
License TreatmentFixed. Installed on the computer. Not requiring a network connection, i.e. will work for the student at home and during travel.License can be a node locked license, a license from a locally provided ANSYS license server or can be provided by the LRZ ANSYS license server (which in turn can host ANSYS licenses originally been purchased by LMU/TUM/HM Departments). All ANSYS licensing mechanisms besides the node locked license require an active network connection to the ANSYS license server.

Actual Version

Since July 2020 the actual version of the ANSYS Software Package is named "ANSYS 2020.R2", while in accordance to the default installation path the software is named v202. This new version ANSYS 2020.R2 has been made the default version / software module of the ANSYS software on the LRZ Linux Cluster and on SuperMUC-NG, while at the same time older versions of the ANSYS software are still supported and provided as separate modules in the module system. At the same time the outdated ANSYS software version 19.0 has been deprecated as a LRZ software module.

SSH User Environment Settings

As described in the LRZ documentation "Using Secure Shell on LRZ HPC Systems → LRZ internal configuration", some applications require special SSH keys for the cluster internal communication. ANSYS Fluent, and potentially other packages from the overall ANSYS software portfolio as well, belongs to this class of applications.

Therefore ANSYS software users should follow the SSH setup steps as outlined here. This section is only relevant for setting up ssh to work without passwords (and without ssh-agent) inside the cluster. This is needed for e.g. batch process startup in some MPI implementations. None of the keys (public or private) generated here should be transferred outside the cluster, since this may incur security problems. The following commands must therefore be executed on the LRZ target system, i.e. one of the Linux Cluster or SuperMUC-NG login nodes.

CommandsRemarks
mkdir ~/.sshMake in your $HOME directory a hidden subfolder for the SSH-Keys and configuration files (if not existing yet).
chmod 700 ~/.sshMake this .ssh subfolder accessible only for yourself, not for the project group and not for others. This is a mandatory setting. With different permission settings SSH connections might not work correctly on LRZ Linux Clusters.

cd ~/.ssh
ssh-keygen -t ed25519 -a 100

Generate an ed25519 key. The command will respond with

Generating public/private ed25519 key pair.
Enter file in which to save the key (/<home-filesystem>/<user>/.ssh/id_ed25519):

to which you respond by typing the ENTER key. Next, you are prompted for a passphrase

Enter passphrase (empty for no passphrase):

to which you should respond by typing ENTER twice (no passphrase).

cd ~/.ssh
cat id_ed25519.pub >> authorized_keys
Add internal public SSH key to the list of authorized keys.

Getting Started

LRZ users are adviced NOT to use Linux Cluster or SuperMUC-NG login nodes for any kind of ANSYS simulations which have the potential to put some heavy processor load on these login node systems or which are potentially consuming large amounts of memory in order not to disturb other cluster users. For such purposes large memory nodes are provided e.g. in interactive cluster queues. It is even more recommended to use for e.g. ANSYS meshing, pre- and postprocessing purposes the LRZ Remote Visualization Systems.

Once you are logged into one of these systems, you can check the availability (i.e. installation) of ANSYS software by:

> module avail ansys

Load the prefered ANSYS version environment module, e.g.:

> module load ansys/2020.R2

Due to the rather special requirements of ANSYS Workbench and its components for the underlying operating system configuration and graphical environment, this part of the ANSYS software can only be supported on the LRZ Remote Visualization System. Once the user has obtained access to one of the RVS machines, the software can e.g. be invoked by:

> module load wb/2020.R2
> vglrun runwb2

For parallel execution of the ANSYS individual software applications (ANSYS CFX, ANSYS Fluent, ANSYS Mechanical, ANSYS Maxwell, HFSS, LS Dyna, etc.) in the LRZ Linux Cluster and SuperMUC-NG batch queuing systems (SLURM) please refer to the provided application-specific subpages of this documentation. If the software of your choice is not yet listed as an available software module, please contact the LRZ application support team.

Since ANSYS Workbench unfortunately does not support SLURM as a scheduler or batch queuing system, it is currently not possible at the compute resources of LRZ to execute ANSYS Workbench projects in distributed parallel mode. This would require an ANSYS Remote Solver Manager (RSM) instance being able to access the SLURM queues, which is currently not a functionality supported by the ANSYS software. The same applies for the currently not possible parametric studies in distributed parallel mode, which makes use of the parameter manager and RSM as well. Coupled simulations of different ANSYS software components, like e.g. fluid-structure interaction simulations involving ANSYS CFD and ANSYS Structural Mechanics, can be executed in distributed parallel mode by applying ANSYS System Coupling in scripted mode and by using appropriately formulated SLURM scripts. Users who are interested in running such coupled simulations are adviced to get in contact with the LRZ Application Support Team through the LRZ Service Desk

Documentation

The ANSYS documentation can be accessed from within ANSYS Workbench or from within each individual ANSYS application through the provided help menue. Furthermore ANSYS documentation is provided for registered users through the ANSYS Customer Portal.

On LRZ systems with available ANSYS installation the online documentation can further be accessed by:

> module load ansys/2020.R2
> anshelp

Mailing List for ANSYS Users

Users of the LRZ ANSYS licenses may join the mailinglist ansys@lists.lrz.de. This list will provide the user with important information about ANSYS software installation at LRZ (e.g. announcement of new versions, system configuration changes or important updates).

More information about ANSYS mailinglist at LRZ may be found here.

User Support

In case of any observed issues in the usage of the ANSYS software on LRZ managed compute resources or any arising questions, please feel free to contact the LRZ support. Please submit your LRZ Service Request with a clear specification of the encountered issue with the ANSYS software, e.g. by indicating in the request subject "ANSYS Fluent problem: ....". This will help the LRZ operators to assign your support request to the most appropriate LRZ staff to assist you.