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To facilitate the understanding and to quantitatively assess the materialtransport in fluids, a modern characterisation method has emerged in fluiddynamics in the last decades footed in dynamical systems theory. It allows toexamine the most influential material lines which are called LagrangianCoherent Structures (LCS) and order the material transport into dynamicallydistinct regions at large scales which resist diffusion or mixing. LCS revealthe robust skeleton of material surfaces and are essential to assess materialtransport in time-dependent flows quantitatively. Candidates of LCS can beestimated and visualised from finite-time stretching and folding fields bycalculating the Finite-Time Lyapunov Exponents (FTLE).  In this contribution, we provide an OpenFOAM function object to compute FTLEduring CFD simulation. This enables the OpenFOAM community to assess thegeometry of the material transport in any flow quantitatively on-the-fly usingprincipally any OpenFOAM flow solver.

lcs4Foam -- An OpenFOAM Function Object to Compute Lagrangian Coherent Structures