On the basis of VOF (volume of fluid) model

the level set function was introduced

and the CLSVOF (coupled level set volume of fluid) model was formed to numerically simulate the process of gas-liquid two-phase oscillating flow and heat transfer. The simulation results of CLSVOF model were compared with that of VOF model

and also compared with the experimental results. The results show that either for the oscillating flow and heat transfer process of two-phase flow in rectangular cavity

or for the oscillating cooling process of engine-oil in piston oil cooling gallery

CLSVOF model can more accurately simulate the oscillating flow rules of gas-liquid two-phase flow

and the calculation values of heat transfer coefficient consist with experimental results much better. For the oscillating cooling calculation of engine-oil in piston oil cooling gallery

with the increase of speed

i .e. Reynolds number

the error of calculation values of heat transfer coefficient increase accordingly. At the ultimate speed of 3000r/min

the error of CLSVOF model is 3.8%

and the error of VOF model is 7.5%; the error increase amplification of CLSVOF model is about 0.6%. The error increase amplification of CLSVOF model is relatively small and stable

so its higher calculation accuracy can be illustrated.