We have added (reinstated) perforated layers in transfer matrix, and transmission loss is more robust than before. I would still be careful using it for transmission loss, however.

We have also added visual guides to the Scattering calculation method. The green sphere is the surface along which receivers are located. The blue box indicates the extents of the Finite Volume Modelspace. The black box indicates Perfectly Matched Layers. The source is the location from which the test signal is emitted. For best results, keep the sample entirely below the green sphere, and do not have any geometry in the model except for the sample. DO NOT ENCLOSE THE MODEL. Let the algorithm decide how to represent the space around the sample. Have fun! 


If you are using the Finite Volume Method in Pachyderm, hopefully you have been wondering about the lack of documentation on my very elaborate and less than intuitive interface tools.

I am working on it, but there is less time available for this stuff these days. Please bear with me.

See the new tutorial page dedicated to the Pachyderm_Numeric_TimeDomain Method here, and proceed with caution. If in doubt, please contact me.

Remember that under the GPL, you are responsible for your own application of these tools.

We have updated the downloads section. (apologies if anyone has been wondering where to download the software... we were unaware that our web host had deleted the download files... If anyone knows of a reasonably priced and reliable web host, we are open to suggestions).

The release candidate that is linked is not perfect, but we think it is very usable. It includes improvements such as:

- First order Biot Tolstoy Medwin edge diffraction

- Transfer Matrix materials design, including sensitivity to indicdent direction and a method for finite size correction (don't use a smart material if you are going to use the finite size correction)

- Finite Volume Method, including an eigenfrequency calculator that is great for modal detection, a method for determining the correlation scattering coefficient, and a great system for visualizing wave behavior.

- Multiple source objects, Common Loudspeaker Format (CLF) and arbitrary directionality support.

- Line sources: Traffic noise, and aircraft takeoff and landing.


- Auralizations over any speaker array you can design

- Smart particle animation (this is something we invented ourselves... it is very similar to other particle animations, but at every frame, each particle searches for its nearest neighbors, and they share energy, leading to a more visually coherent result that is easier to read)

- Animation over maps

- Support for Grasshopper, including icons (thanks to Pantea Alembeigi, RMIT)

- Support for IronPython

Thanks to Professor Isak Worre Foged, for putting together this set of videos on acoustics, and Pachyderm tutorials. You can find them here.

Questions and comments about the videos should be directed to This email address is being protected from spambots. You need JavaScript enabled to view it..

As always, questions about Pachyderm should come to This email address is being protected from spambots. You need JavaScript enabled to view it.