Ansys Hfss Help

[Jules Altier]

Toobtain the files needed to follow this tutorial, click on the Job Setup link below and clone the job hosting the file. Next, click the Save icon to have a copy of the files in your Rescale cloud files.

NOTE : Although you can run this job directly, to continue with this tutorial do not submit it directly. We are cloning the job in order to import the simulation input file ansys-hfss-electronics-example.aedtz into your account. You can also obtain the results of the job by clicking on Get Job Results.

If you have an archived simulation .aedtz file in your local environment ready for batch submission, feel free to skip the next few sections. You can go ahead and begin the batch submission section. Or if you want to just create the packed .aedtz from the ANSYS HFSS GUI, you can skip to this section before going on to batch submission. Otherwise, please continue:

Since we have prepared our simulation and uploaded the file back to the Rescale Cloud, we are done using our ANSYS Electronics GUI for the time being. We can now shutdown this Desktop instance. You can choose to keep the instance running to perform post-processing after the simulation is completed.

Additional Guide: Generally, HFSS workflows are very memory bound, so it is recommended to use high memory coretypes such as, Zinc or Melanite for your workflows. If you discover that during frequency sweeps the memory usage is low, then switch to a lower memory coretypePre-configured and optimized architectures for different HPC... More such as Emerald.

Failed to enable feature using current license settings. Note that Pro. Premium, Enterprise licenses are available on your server. To use these licenses check the corresponding Ul option. For more information, search for "PPE" in the help documentation. Failover feature 'HFSS solver' is not available. Request name hfss solve does not exist in the license pool. No such feature exists. Feature hfss solver License path: 10...@LICENSESERV.FIT.EDU: FlexNet Licensing error: 5.

ANSYS HFSS software product is aimed for low/high frequency electro-magnetic wave propagation simulations. This software was formerly acquired fro the company ANSOFT and is part of the ANSYS software portfolio since 2008. ANSYS HFSS is a commercial finite element method solver for electromagnetic structures from ANSYS Inc.. The acronym HFSS stands for high-frequency structure simulator. ANSYS HFSS is nowadays a 3D electromagnetic (EM) simulation software for designing and simulating high-frequency electronic products such as antennas, antenna arrays, RF or microwave components, high-speed interconnects, filters, connectors, IC packages and printed circuit boards. Engineers worldwide use ANSYS HFSS to design high-frequency, high-speed electronics found in communications systems, radar systems, advanced driver assistance systems (ADAS), satellites, internet-of-things (IoT) products and other high-speed RF and digital devices.

Further information about ANSYS HFSS, licensing of the ANSYS software and related terms of software usage at LRZ, the ANSYS mailing list, access to the ANSYS software documentation and LRZ user support can be found on the main ANSYS documentation page.

With ANSYS Release 2019.R3 it was made an attempt, to make ANSYS Electronics Software available on LRZ HPC systems, i.e. Linux Clusters CMUC2/3.

Unfortunately the ANSYs Electronics Software is entirely relying on the ANSYS proprietory scheduler ANSYS Remote Solver manager (RSM), which is not compatible with the scheduler SLURM being utilized on LRZ HPC systems. With the direct help from ANSYS developers it was successful for ANSYS Release 2019.R3 to get electronics software solvers like Maxwell-2d/3d and HFSS running on LRZ HPC systems. But this required support from the ANSYS developer team was no longer provided for later releases of the ANSYS software.

Therefore ANSYS Electronics software in Releases later then version 2019.R3 are currently known to run only on local laptops/workstations (mainly under Windows operating system or on Linux with a locally provided ANSYS RSM scheduler). In case of more specific questions on ANSYS Electronics software on LRZ HPC systems, please send your querry to LRZ Support.

Once you are logged into one of the LRZ cluster systems, you can check the availability (i.e. installation) of ANSYS HFSS software by checking availability of a corresponding ANSYS Electronic Desktop module:

One can use ANSYS Electronic Desktop with all its integrated simulation approaches in interactive GUI mode for the only purpose of pre- and/or postprocessing on the Login Nodes (Linux: SSH Option "-Y" or X11-Forwarding; Windows: using PuTTY and XMing for X11-forwarding). This interactive usage is mainly intended for making quick simulation setup changes, which require GUI access. And since ANSYS Electronics Desktop is loading the mesh into the login nodes memory, this approach is only applicable to comparable small cases. It is NOT permitted to run computationally intensive ANSYS HFSS simulation runs or postprocessing sessions with large memory consumption on Login Nodes. The formerly existing Remote Visualization systems have been switched off in March 2024 without replacement due to their end-of-life. Any work with the ANSYS software being related to ANSYS Electronics Desktop, interactive mesh generation as well as graphically intensive pre- and postprocessing tasks need to be carried out on local computer systems and by using an ANSYS Academic Research license, which is available from LRZ for an annual license fee.

It is not permitted to run computationally intensive ANSYS HFSS simulations on front-end Login Nodes in order not to disturb other LRZ users. However, the ANSYS HFSS simulations can be run on the LRZ Linux Clusters or even on SuperMUC-NG in batch mode. This is accomplished by packaging the intended ANSYS HFSS simulation run in a corresponding SLURM script, as it is provided here in the following example.

All parallel ANSYS HFSS simulations on LRZ Linux Clusters and SuperMUC-NG are submitted as non-interactive batch jobs to the appropriate scheduling system (SLURM) into the different pre-defined parallel execution queues. Further information about the batch queuing systems and the queue definitions, capabilities and limitations can be found on the documentation pages of the corresponding HPC system (LinuxCluster, SuperMUC-NG). By default ANSYS is supporting only commercial schedulers (e.g. LSF, PBS-Pro, SGE, ANSYS RSM) for the parallel simulation of ANSYS EM products. But more recently ANSYS EM is providing a first beta-state implementation of scheduler support for SLURM (called: ANSYS EM Tight Integration for SLURM). Based on this still a bit "experimental" SLURM scheduler support, the following parallel execution capability is provided for the LRZ cluster systems.

The configuration of the parallel cluster partition (list of node names and corresponding number of cores) is provided to the ansysedt command from the batch queuing system (SLURM) by the provision of specific environment variables.

Furthermore we recommend to LRZ cluster users to write for longer simulation runs regular backup files, which can be used as the basis for a job restart in case of machine or job failure. A good practice for a 48 hour ANSYS HFSS simulation (max. time limit) would be to write backup files every 6 or 12 hours. Please plan for the setting of wall clock time limit enough time buffer for the writing of output and results files, which can be a time consuming task depending on your application.

Also at this time ANSYS 2020.R1 has been set as the default version, the ANSYS EM Tight Integration for the SLURM scheduler is currently only available for ANSYS EM Version 2019.R3.

Assumed that the above SLURM script has been saved under the filename "hfss_mpp3_slurm.sh", the SLURM batch job has to be submitted by issuing the following command on one of the Linux Cluster login nodes:

Warning: Do NOT use additionally mpirun, mpiexec or any srun command to start the parallel processes. This is done by a MPI wrapper by the ansysedt startup script in the background. Also, do not try to change the default Intel MPI to any other MPI version to run ANSYS HFSS in parallel. On the LRZ cluster systems only the usage of Intel MPI is supported and known to work propperly with ANSYS HFSS.

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