Two-dimensional pressure field of circular disk grooved thrust bearing when it does three kinds of elementary unsteady motions has been successfully analyzed using potential flow theory. The cancellation of the pressure jump by putting line vortices on the groove-land boundaries is demonstrated to be useful. The analysis of the velocity field can be carried out only in one basic domain, while the pressure field must be calculated in every domain by doing rather complicated selection among infinite number of values of inverse tangent.

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