It is in concept rather similar to the much older smoothed particle hydrodynamics.
In fact the method boils down to the well-known moving least squares for the particular case of a global approximation (using all available data points).
Using this function approximation method, partial differential equations and thus fluid dynamic problems can be solved.
For this, they coined the term diffuse element method (DEM).
Advantages over finite element methods are that DEM doesn't rely on a grid, and is more precise in the evaluation of the derivatives of the reconstructed functions.