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Hi,

I am currently using GeoDict for particle tracking simulations, and I have a question regarding the implementation of periodic boundary conditions in this context.

The user guide states: "With Periodic boundary conditions, the particle will leave the domain and reappear on the opposite site." I would like to understand how this is handled mathematically, especially in the case of non-periodic geometries.
Specifically: When a particle exits through one boundary , how is its re-injection position on the opposite face determined? If a solid structure (e.g., a fiber) happens to occupy the re-injection location on the opposite face, how does GeoDict handle this situation?

Thank you in advance for your clarification

Hello,

I am currently using GeoDict (FilterDict module) and I have a question regarding the temporal resolution used to integrate the particle equation of motion in a Lagrangian framework.

I could not find clear information in the documentation about how the time step is defined or controlled when solving the particle equation of motion. Is the time step fixed or adaptive? And where can this information be accessed?

In addition, when visualizing particle trajectories, I noticed that a spatial resolution of 0.5 voxel is used by default. Is this parameter related to the temporal resolution (time step), or is it only used for visualization purposes?

More generally, how can one assess the accuracy or convergence of particle tracking simulations with respect to the time discretization in GeoDict?

Thank you in advance for your help.