Nauticle is a general-purpose simulation tool for the flexible and highly configurable
application of particle-based methods of either discrete or continuum phenomena. The
paper introduces a novel approach to the implementation which handles a general formulation
composed of user-defined expressions and interaction-laws covering an extensive range
of particle-based methods. As a result, Nauticle has three distinct levels for users
and developers. At the top level, the Symbolic Form Language (SFL) of Nauticle facilitates
the formulation of user-defined numerical models in text-based configuration files.
The SFL can be intuitively extended at the intermediate level with new particle methods
without tedious re-coding or even the knowledge of the bottom level. The paper presents
the structure of the underlying general algorithm; then the top two levels are discussed
in detail and illustrated by simple application examples. Finally, the efficiency
of the code is also tested through a performance benchmark.