Before revision: In the context of flow visualization a triple decomposition of the velocity gradient was proposed by Kolat in 2007 who demonstrated the technique in 2D , which was later realized in 3D by Nagata et al. in 2020.
After revision: In the context of flow visualization a triple decomposition of the velocity gradient was proposed by Kolat in 2007 who demonstrated the technique in two dimensions , which was later realized in 3D by Nagata et al. in 2020.