Abstract: In order to compare the fluid dynamic performance of textured surfaces based on N-S equation and Reynolds equation under hydrodynamic lubrication, respectively, and then put forward a criterion about the scope of the two equations in establishing the lubrication computation model of surface texture, the influence of inertia on fluid dynamic characteristics is studied by solving the lubrication computation model of surface texture based on N-S equation and the scope of Reynolds equation is also discussed by changing the ratio of typical fluid domain length l to clearance of the friction pairs h0. The results show that the influence of inertia cannot be neglected when l/h0 is less than 46 and N-S equation must be adopted; the more significant the influence of inertia, the greater the load capacity of the surface texture and the easier the liquid swirl to produce, thus the influence of inertia should be increased and the emergence of the liquid swirl should be avoided in parameter design of surface texture; the influence of inertia can be neglected when l/h0 is not less than 46 and Reynolds equation can be adopted instead of N-S equation, however, the influence of cavitations on pressure distribution must be considered. The results provide a certain reference for the design and modeling of surface texture.

Key words: CFD analysis, Inertia, Lubrication computation model, Surface texture