Ansys

module avail ansys/

ANSYS is a general nonlinear multiphysics software offering structural and thermodynamic analysis, continuum flow analysis, analysis of electrostatic and electromagnetic fields and acoustic analysis.

ANSYS can be run either from module or from a service.

Usage

OnDemand

ANSYS can be run in a browser as OnDemand service. This is the most straighforward and simplest way.

Kubernetes

Another option is to use Kubernetes service, which offers ANSYS application as a Rancher application.

Module

Although this application can be used in text-only mode, in most use cases you will need graphical interface. We recommend to use remote desktop.

Running ANSYS from a module is recommended to advanced users or as a fallback option in case OnDemand and/or Kubernetes service cannot fulfill the user’s requirements.

License

All installed ANSYS versions are available to all MetaCentrum users without location restriction.

Check the number of currently available licenses:

module add ansys/2021-R1
lmutil lmstat -c 1055@lm-brno.ics.muni.cz -a    # list all licences for all software

# filter specific license feature "cfd_base"
lmutil lmstat -c 1055@lm-brno.ics.muni.cz -a | grep cfd_base

or you can use Ansys specific license tool

`which ansysli_util` -statli 2325@lm-brno.ics.muni.cz -printavail

# with filter to specific license feature "cfd_preppost":
`which ansysli_util` -statli 2325@lm-brno.ics.muni.cz -printavail | grep -B 3 -A 6 "FEATURENAME: cfd_preppost"

Number of available licenses:

Ansys Academic Research CFD (Ansys Fluent + Ansys CFX) in quantity of 25 parallel runs
Ansys Academic Research Mechanical in quantity of 5 parallel runs
additional tool Ansys HPC in quantity of 512 pieces (=> cores)

Available tools (complete list of available products is HERE):
    FLUENT : command fluent
    CFX : command cfx* (e.g. cfx5, cfx5launch, cfx5post, etc.)
    CFD Post : command cfdpost
    ICEM-CFD : command icemcfd
    Workbench : command runwb2

Ask scheduler for licence by adding one of the following options:

-l ansys-cfd=1     # 1 license of Ansys CFD
-l ansys-mechwb=1  # 1 license of Ansys Mechanical Workbench
-l ansys-anshpc=Z  # Z licenses of Ansys HPC

Available ANSYS products

The following Ansys products are available within the MetaCentrum infrastructure:

• Ansys CFD - product combining two primary general-purpose fluids simulation products offered by ANSYS - Ansys Fluent and Ansys CFX.

- **Ansys Fluent** contains the broad physical modeling capabilities needed to model flow, turbulence, heat transfer, and reactions for industrial applications.
- **Ansys CFX** is a general purpose fluid dynamics program for simulating all types of models concerning fluid flow, including effects of temperature(conductance, radiance).

• Ansys Mechanical - product for simulating of structural and thermodynamic tasks. The engineering simulation product provides a complete set of elements behavior, material models and equation solvers for a wide range of mechanical design problems.

Ansys Fluent

Ansys Fluent supports both interactive and batch use.

Interactive usage

For graphic environment, open the GUI interface.

For text-only regime login to a frontend and ask for interactive job in the standard way

ssh skirit.ics.muni.cz
qsub -I -l select=X:ncpus=Y:mem=Zgb  # text-only regime

Start Fluent and proceed according to onscreen instructions

module add ansys/18.2
fluent # graphic regime
fluent -g # text-only regime

Batch usage

Login to a frontend

Prepare input data and batch script — in the script, use following commands:

a) for serial computation:

module add ansys/18.2
fluent <version> -g -i input_file  # serial initialization of Fluent

b) for paralel/distributed computation:

module add ansys/18.2
cpus=`cat $PBS_NODEFILE | wc -l`
fluent <version> -t${cpus} -p -cnf=$PBS_NODEFILE -g < flow.input  # parallel/distributed initialization of Fluent

Note: you can get list of available versions by running $ fluent -v.

Submit the batch script:

skirit$ qsub -l select=X:ncpus=Y:mem=Zgb batch_script.sh

Parallel batch usage

It seems that best usage of parallel fluent differs from HW where fluent runs (infiniband vs. omnipath), as a rule of thumb you can use:

  if test $(sort -u < $PBS_NODEFILE |wc -l) -gt 1 -a -w /dev/hfi1_0;then  
          MPI_IMP=-mpi=intel
  fi
  fluent 2ddp -g -t$PBS_RESC_TOTAL_PROCS $MPI_IMP -cnf=$PBS_NODEFILE -i case.jou > case.out 2>&1

To utilize homogeneous cluster (fluent cannot optimally use nodes with different performance) , one should submit via:

qsub -l select=N:…:infiniband=^none -l place=group=cluster …

Ansys CFX

Interactive usage

For graphic environment, open the GUI interface.

For text-only regime login to a frontend and ask for interactive job in the standard way

ssh skirit.ics.muni.cz
qsub -I -l select=X:ncpus=Y:mem=Zgb  # text-only regime

Start CFX and proceed according to onscreen instructions

cfx5 # graphical mode
cfx5launch # text-only mode

Batch usage

Login to a frontend

Prepare input data and batch script — in the script, use following commands:

a) for serial computation:

module add ansys/18.2
cfx5pre -batch inputfile.pre [...]
cfx5solve -def inputfile [...]
cfdpost -batch inputfile.cse [...]

b) for paralel/distributed computation:

module add ansys/18.2

#### Create host list
hl=`sort $PBS_NODEFILE | uniq -c | awk '{print $2"*"$1}' | tr '\n' ',' | sed 's/,$//'`

#### Run the computation, e.g.
cfx5solve -def 0.def -ccl 0.ccl -part-large -start-method "Platform MPI Distributed Parallel" -par-dist $hl

Submit the batch script:

skirit$ qsub -l select=X:ncpus=Y:mem=Zgb batch_script.sh

Ansys Workbench

For graphic environment, open the GUI interface.

Start Workbench in the graphical mode

runwb2 # graphical mode

Documentation

Software documentation is available locally in program’s directory:

• version Ansys 18.2: /software/ansys-18.2/doc/readme.html
• version Ansys 18.0: /software/ansys-18.0/doc/readme.html
• version Ansys 17.2: /software/ansys-17.2/doc/readme.html
• version Ansys 17.1: /software/ansys-17.1/doc/readme.html
• version Ansys 16.2: /software/ansys-16.2/doc/readme.html
• version Ansys 16.1: /software/ansys-16.1/doc/readme.html
• version Ansys 15: /software/ansys-15/doc/readme.html
• version Ansys 14: /software/ansys-14/doc/readme.html