The acoustic performance of a textured journal bearing is studied based on computation fluid dynamic (CFD) theory and acoustic equation involved. First, a micro-grooved journal bearing is modeled through commercial software ANSYS. Then, the acoustic power levels for the journal bearing at different depths, widths, and positions of the dimples are solved through the CFD method. The numerical results show that the existence of dimples can lower the acoustic power level of the bearing. Moreover, this reduction depends on the dimple sizes and position. The dimples showing good tribological behaviors can yield severe noise.

Tribological mechanism of the diatom frustule with multi-layers of pores is studied with the liquid-solid interaction (FSI) method. Based on the reconstructed representative Coscinodiscus sp. frustule with two-layer porous structure, the tribological performances for the diatom frustule at its different pore diameter ratios, pore depth ratios, and velocities are solved through governing equations involved with FSI method. The numerical result shows that the existence of the two-layer porous structure of the diatom helps to reduce the friction between it and ambient water, and to increase its ability to resist the ambient water pressure. The two-layer porous structure effectively improve the tribological performances for the diatom frustule due to the change in the frustule velocity.

Tribological performances of the diatom frustule are investigated with the liquid-solid interaction (FSI) method. Take, for example, the representativeCoscinodiscussp. shell; the diatom frustule with the porous structure is achieved by the scanning electron microscope (SEM). Based on the frustule, the representative diatom frustule is modeled. Further, tribological performances of the diatom at its different geometry sizes and velocities are solved with FSI method and compared with corresponding values for the nonporous structure. The numerical result shows that the existence of the porous structure of the diatom helps to reduce friction between it and ambient water and to increase its load-carrying capacity.