About GELATO
GELATO(GEneralized LAgrangian Tracking with Optimization) is a tool to track and visualize the trajectory of various materials specified by the user using the calculation result of various flow calculation solvers implemented in iRIC. The target transported substance is not only completely following the flow, but also the substance itself has a cruising ability, a typical example is a fish, by specifying its ability and characteristics to express its movement.

The GELATO determines the concentration (density) of the tracer particles at a given location in the fluid and it has the ability to clone or amalgamate itself as needed. This usually allows the tracer to be visualized the image in the detached area where particles cannot easily invade, or in the area where particles have accumulated and become extremely difficult to see.

In addition, GELATO can also display weighted particle concentrations that take into account splitting and binding. It is possible to analyze the concentration by a substantial Lagrangian method.

Note that the GELATO can extract the turbulence below the grid scale modeled in the solvers by introducing a random walk model. This allows to examine more realistic particle tracking and concentration diffusion fields.

About ver2.x
In March 2025, GELATO ver2.0 was released.
Prior to this, in addition to the publicly available ver1.x, multiple unpublished versions with different features and specifications existed. The person responsible for managing ver1.x at the time was overwhelmed by the increasing number of derivatives, leading to the creation of ver2.0.
Ver2.0 integrates all functionalities from ver1.x and its derivative versions, fixes known bugs, and has been completely rewritten from scratch. Therefore, please note that it is not compatible with projects from ver1.x.

online manual is here
for iRIC v4
–GELATO v1.x
–GELATO v2.x
for iRIC v3
–UTT