The authors thank Professor Mihai Arghir for having performed the computational fluid dynamics (CFD) simulations of the flow fields for the two test damper configurations. The predictions demonstrate, as expected, the flow field in the deep feed groove and lubricated through feed holes to be extremely complicated. The brief discussion on the evolution of the flow patterns (vortices) along the various planes of observation is most enlightening.

As per the question, “how can the magnitude of the groove effective depth be objectively selected knowing that the flow field is so complex?” the authors concur with Dr. Arghir's judgment, that is, one cannot ascertain the effective groove depth from simple knowledge of fluid mechanics. The effective depth depends not only on the geometry of the groove and adjacent film land but also on the lubricant properties and the operating conditions. That is, as stated in the...

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