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How to get started

To help you get started on CrunchYard, we have included example simulation files for you to look at and test the system with. Some applications like DCIP (DC Inversion) requires a special folder structure, so check your chosen application's example file for included files and structure if your simulation keeps failing.

Example Simulation Files Suggested cores to use Help file
Computational Chemistry
ADF ADF 1 Node (8 cores) Please click here to read more.
CP2K CP2K 1 Node (8 cores)
LAMMPS LAMMPS 1 Node (8 cores) Please click here to read more.
NWCHEM NWCHEM 1 Node (8 cores)


What are the rules for naming the simulation before upload?

Keep to the following naming standards as much as possible.

  • Dont have any spaces in the file name
  • Dont have any . (dot) in the file name apart from the . (dot) between the name and extention
  • Keep to only using numbers and letters in the filename, avoid any special characters
  • If a package manager is used for compiling the simulation, for example FEKO, dont give the package and the model the same name

How do I access the progress or result file?

When a simulation file is uploaded it is listed in the progress area on the right hand side. As soon as processing begins the filename becomes clickable and you can view the progress file. When it’s done the same link will take you to the results file.

I cannot click on the file name to view my results or progress?

There could be two scenarios where the filename is not clickable.
*The first scenario is when a simulation gets uploaded. The simulation lands up in a queue for processing. While it is in the queue no progress file is available. Once processing starts a progress file gets created and therefore the filename becomes clickable allowing you to view its progress.
*Second scenario is when the simulation was completed and you have deleted your results. We do not keep backups of results files, so if it’s deleted there is no way for us to give you a copy.

My simulation just hangs, what is happening?
Try using fewer resources, especially fewer cores. Throwing a large amount of resources at a problem might cause communications overheads which could stall a simulation.

My simulation ended too quickly?

Check the log file that is available in the output file. It will give you more information regarding any error messages generated during the simulation.

Why is my simulation file being renamed?

In order to prevent people from overwriting an existing file with the same name, we add a random number to the filename.

I made a mistake in my simulation file. How do I stop the process?

At any time during the processing of the file can you cancel the process. To do that, just click on the red button next to the filename and it will stop the process.

Does CrunchYard keep a backup of simulated data?

CrunchYard does not keep a backup of simulated data or problems submitted. The only information retained is the .log file and .pro file. Once a file has been deleted from you profile you will not be able to retrieve it.

CrunchYard offers an engineering simulation service over the Internet on a pay per use basis. The service allows scientists and engineers to submit simulations via a web page that then run on a cluster.
How it works
1. Upload your model
2. Check your progress
3. Download your results
Recent News

FEKO suite version 7.0 available on CrunchYard

Feko, the comprehensive electromagnetic simulation software, has released their 7th version, and it’s available on CrunchYard. The new version adds a finite difference time domain solver (FDTD) as well as a powerful hybridization of Multilevel Fast Multipole Method and Physical Optics (MLFMM and PO). The release has been eagerly awaited and features three new import file formats (Gerber, ODB++ and 3Di). FEKO 7 is also available via FTP and scripting access on CrunchYard for advanced users.

Register an account at or email us at

CrunchYard is pleased to announce direct scripting and FTP access for advanced users.

This new service allows advanced users to interact dynamically with CrunchYard in conjunction with our easy to use web portal. Parameter variations across simulations can be scripted in your own code and submitted to CrunchYard in real time.

In additional, all FTP and scripting activity is mirrored on users personal CrunchYard profile.

FTP and scripting access is free and granted on a request basis. The new service applies to all codes on CrunchYard.

Other licensed codes are available on request.

Register an account at or contact Dr Renier Dreyer at +27 (0)11 717 6379

CrunchYard is pleased to announce their academic offering for HPC in the cloud

The academic offering allows anyone with a valid academic e-mail to instantly access the online HPC facility.

Group accounts can be created for your research group, where simulation credits are shared. Credits are valid for 2 months after purchase.

Academic accounts include access to over 300 true CPU cores, and the following simulation software:

  • FEKO
  • CP2K

Other licensed codes are available on request (such as CPMD, STAR-CCM+ etc.)

Register an account at or contact Dr Renier Dreyer at +27 (0)11 717 6379