Abstract:Sliding bearing oil film bubble phenomenon possible appears due to the insufficient oil pressure or mechanical failure during operation, which will result in the decline of loading capacity or the oil film rupture. Based on the basic theory of gas-liquid two phase flow and the numerical simulation techniques, the physical model and mathematical model, the corresponding initial and boundary conditions were established aimed the phenomenon of lubricant film in sliding bearing containing a single large bubble. The bubble dynamic behavior was analyzed by using the VOF model, the fission process of large bubble, and the evolution process of the subbubble were simulated. The results show that the non symmetry rupture occurs easily for the large bubble in bearing oil film in working process, and the subbubbles with different sizes in diameter are formed. The bubble is close to the outer ring of the bearing under the action of centrifugal force in working process, and some bubbles are adhered in the bearing outer wall.The bubble ruptures faster, when bearing speed is faster.