Computation of 2D Lagrangian Variables from Velocity Fields

This repository provides a Fortran module (ftlv_fsle_pdua_iv.f90) for computing Lagrangian trajectories, finite-time Lagrangian vorticity (FTLV), and the finite-size Lyapunov exponent (FSLE) from velocity fields. The scripts compute_fsle.py and compute_ftlv.py read and select the velocity fields before passing them to the Fortran module for processing and save snapshots of the newly created lagrangian variables.

Installation and Usage

The Fortran module used independently or compiled into a Python-compatible library using f2py. To compile with f2py, run:

f2py -c -m ftlv_fsle_computation ftlv_fsle_computation.f90

or can be simply downloaded within this package: ftlv_fsle_ekst_computation.cpython-312-x86_64-linux-gnu.so

Once compiled, the module can be imported as a library and used in compute_fsle.py and compute_ftlv.py scripts.

Requirements

• Linux OP
• Fortran compiler
• numpy (for f2py functionality)
• Python (compatible with f2py)

Authors

Diego Cortés Morales

Ismael Hérnandez Carrasco