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University of Stuttgart

	Institute of Engineering and Computational Mechanics
	Particle Simulation Package Pasimodo

Pasimodo Showroom

What is Pasimodo?

Pasimodo is a program package for particle-based simulation methods. The main field of application is the simulation of granular media, such as sand, gravel, granulates in chemical engineering and others. Moreover it can be used for the simulation of many other Lagrangian methods, e.g. fluid simulation with Smoothed-Particle-Hydrodynamics.

How to get Pasimodo?

The software Pasimodo is a joined development of the ITM and its spin-off Inpartik. Inpartik provides sales of and commercial support for the software. Moreover, the software plays a major role in may industrial and PhD projects of the ITM. Although Pasimodo is not an open-source project, the ITM provides free of charge access to Pasimodo for selected non-commercial research projects.

Read more about Pasimodo on Inpartik's dedicated webpage

Visit the Pasimodo show room

What are Pasimodo's skills?

Pasimodo can do almost anything, except cook. What it hasn't mastered yet, it can be taught, provided the user has some knowledge of C++. The main focus of Pasimodo is the dynamic simulation of granular matter; an additional feature that will enable Pasimodo to be used in conjunction with a fluid simulation is just in the works. Due to the modular structure of the program it is possible to incorporate plug-ins that have been created by the user to accommodate his or her own needs. Particle-interactions that feature a history, as well as the possibility to add and remove particles during the simulation are only some features of special interest. Due to these and many other features Pasimodo is especially suitable for research applications.

The following gives an overview about some of Pasimodo's ample features:

XML-based input and output data interface

parallel simulation with MPI

designed/optimized for:

application on heterogenous university-clusters

many concurrent processes

dynamically changing processor loads

dynamic controler-based load-balancing

good scaling behavior

various integrators available:

explicit schemes

implicit schemes with time step controling

various particle-/object-types:

balls

surface triangles

polyhedral bodies (work in progress)

macro objects

block (regular setup of arbitrary object types)

image (using bitmaps for object setup)

mesh (simplifies reading triangle surface-meshes)

various interactions/potentials:

normal forces

Coulomb friction

slip friction with tanh-approach

efficient cache-optimized nearest-neighbor search

graphical user interface

postprocessing

color coding of object states

easy generation of images or video

allows for arbitrary camera flights

allows for choosing specific objects via mouse in order to analyze their state data

based on Gtk++ (gtkmm) and VTK

thread-based

virtual-reality interface

all program components fully serializable

freeze the simulator state with all its components

suspend/resume simulation processes

migration of simulation processes between processors

data transfer between processors of the parallel program

equation-based state input for objects/particles, coordinate systems...

object-oriented implementation in C++ using expression templates

runs under Linux and Windows/cygwin

simulation in 3D (2D)

quaternion-based description of rotations

allows for the addition/removal of objects (particles) during the simulation

plug-in interface to incorporate new objects/particles, integrators and interactions (potentials)

program-integrated documentation, thus always up to date

Why isn't Pasimodo available for download?

Due to a lack of time we are not able to offer support for Pasimodo. But as support is indispensable for a rapidly growing program package such as Pasimodo, which is constantly being developed further, we have decided not to offer Pasimodo for download for the moment. We are, however, always interested in an application of Pasimodo within the framework of cooperations and projects.