If we do not have a uniform grid, but instead a tessellation of other shapes/polygons, would we be performing Eulerian if we update the position of each face/vertex? For example, in a triangle mesh, it is very easy to find the neighbors of any given vertex, so in this way it is not like polygon soup. If we update each vertex position to simulate a fluid, would we be using Eulerian or lagrangian?

If we do not have a uniform grid, but instead a tessellation of other shapes/polygons, would we be performing Eulerian if we update the position of each face/vertex? For example, in a triangle mesh, it is very easy to find the neighbors of any given vertex, so in this way it is not like polygon soup. If we update each vertex position to simulate a fluid, would we be using Eulerian or lagrangian?