Dealiasing optimization to have zero-padded spectral arrays
Created originally on Bitbucket by avmo (Ashwin Vishnu)
To quote a reviewer's suggestion:
De-aliasing requires to take into account more degrees of freedom in the spatial fields than in the spectral ones. In particular, for 3D fields, de-aliasing implies that many zeros are present in the fields, and actually do not need to be transformed, potentially saving significant computation time. As far as I know, FFTW always transforms full fields. Does fluidFFT allows for this optimization even if the underlying library does not? Is it relevant?