Ahmed Shaaban @Ahmed-Shaaban-13

Below is an image for material deformation from Wlandar 1955 (page 146) (Article Studies on the General Development of Motion in a Two-Dimens...

). The figures show a low-pressure system that undergoes an evolution process, part of that low (western part). Imagine that we filled part of that low-pressure system with a white and back color resembling a chess board (grid) structure to study the deformation of the fluid as depicted in a-e panels. Can we judge if this deformation of the surface elements is reversible or not? I am not really sure how to define the deformation of the material contour. Also, could a series of linear transformations (e.g., translation, rotation, stretching, etc.) lead to an irreversible structure? Thanks