Complex sentence: At present, the computational costs are significantly higher than that of DNS when Kn or DPS when St\\ approx O (1), and the finite-volume flux methods introduce errors that can lead to instabilities in the moment-inversion process.
Split into simpler sentences: At present, the computational costs are significantly higher than that of DNS when Kn or DPS when St\\ approx O (1). Additionally, the finite-volume flux methods introduce errors that can lead to instabilities in the moment-inversion process.