Ansys EM

A version of Ansys Electromagnetics suite is installed for Leeds researchers who have access to either their own or a departmental license. This supports the infiniband interconnect so can be used for large runs with many processors, if the problem warrants it.

Various field solvers are included, such as HFSS and Maxwell

Setting up the license

The application obtains the license location through the LM_LICENSE_FILE variable. To set it in bash do:

To get the values of port@machine specific to your group/department please contact your local IT support.

Setting up the path/environment:

All variables can be set by loading the ansys module:

To load a specific version of AnsysEM, specify this on the module command i.e.:

HFSS

Once the ansysem module is loaded and the LM_LICENSE_FILE variable set, HFSS can be run by executing the command hfss from the command prompt. By default, this will launch the HFSS graphical user interface (GUI).

The first time this is run, it will take a short while to setup your configuration files. Once complete, it will ask you for a default directory to look for project files. We suggest you use /nobackup/USERNAME/Ansoft (replacing USERNAME as appropriate).

At this point, the GUI is running on one of the login nodes, which is not appropriate for intensive computation; however, it can be used for simple tasks, such as: looking at results, preparing project files or submitting jobs to the batch queue system.

When calculations need to be done, the work needs to be given to the batch queue as a job, where it will be given dedicated access to the resources it needs. Please see the sections below on how to do this.

Running the GUI through the batch queues

To launch the graphical interface in an interactive shell, issue the following on the command line:

In the above command, hh:mm:ss is the length of real-time the shell will exist for, vmem is the amount of memory required, dim is the dimension/precision of the fluent process (e.g. 2d for two dimension, single precision).

Running a batch job via the command line (serial or parallel)

HFSS simulations can be executed in serial or parallel through the batch scheduler. To do so, ensure you also have the sge module loaded, create a job submission file of either of the following formats, then submit it using the qsub command.

Prior to submission, you will want to modify port@machine to include license details, plus h_vmem and HFSS/DesiredRAMLimitInGB to indicate the maximum amount of RAM to make available (note: for parallel jobs, we believe HFSS/DesiredRAMLimitInGB should be the same value as h_vmem multiplied by the number of cores requested – although this has not yet been tested).

See the HFSS online documentation (available from the GUI) for further options.

Example serial job submission script

Example parallel job submission script

(modify the 8 in the first line to equal the number of cpus you require)