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Most of the numerical studies of rotary lip seal are performed by considering lip or shaft as smooth surfaces. Although this assumption is far from practice, it is, the best approach to avoid the transient term of Reynolds equation.
In the present work, Reynolds equation was resolved by taking into account: the roughness of the both surfaces and also the cavitation effect. In order to investigate the shaft roughness effect, an implicit with "finite differences" was used. A comparison was made between results of the current numerical results and the finite volume method published in the international literature.
Numerical simulations show that the shaft roughness affects significantly the friction torque, the leakage and the load support of the lip seal.
