It should be noted that the literature survey in this paper [1] is greatly lacking. Moreover, the fundamentals of gas-lubricated tribo-elements are grossly overlooked or even misunderstood, pointing first to the theoretical background which in its entirety can be found elsewhere [2–8]. The authors do not explain how they enforce mass flow continuity across groove-land borders (see Refs. [4–6]). In fact, the authors use a successive over relaxation (SOR) method, i.e., using a finite difference scheme that by definition contains singularities in the derivatives of the film thickness as imbedded in Eq. (4)—the authors do not explain how that is handled. The SOR method, which was popular in the 1950s or 1960s, is a method that is clearly unfit for spiral groove seals that contain film thickness discontinuities. Moreover, with or without spiral grooves, it...

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