Dynamics behavior of a vapor bubble such as rising, growth and deformation in superheated liquid was simulated with three-dimensional lattice Boltzmann phase-change model. To study effect of heat and mass transfer on vapor bubble, process of bubble rising in isothermal system was simulated. It shows that deformation extent of vapor bubble is small in superheated liquid. It is suggested that the effect of phase-change on vapor bubble is similar to surface tension force, which makes vapor bubble tend to keep its initial shape. Rising velocity of vapor bubble in superheated liquid was smaller. It implied that the effect of drag force on vapor bubble was dominant in superheated situation. In addition, growth rate of vapor bubble reaches the maximum at initial stage; Then it tended to nearly a constant. As vapor bubble volume and velocity increase, influence of disturbance on flow field is more and more intense. Meanwhile, growth of vapor bubble and convection induced by bubble rising have great impact on evolution of temperature field.

The numerical computation is often used to predict or study pool fires.The fluid flow,heat and mass transfer,chemical reaction and their interaction in the burning process are studied by formulating and solving a set of governing equations.The treatment of oil surface is given in details also.Many results of pool fires under various wind speeds are gained,and computational results are obtained.

By applying different schemes of meshes, the calculations of flow fields in pulverized coal boilers are discussed.The results show that false diffusion may be tremendous when using meshes generated in a normal method.Consequently, the error of results is very high.Meanwhile, acceptable results may be obtained when using properly generated meshes.

Employing the Boundary-Fitted Orthogonal Curvilinear Coodinate Systems, this paper tries to make the numerical simulations of a cold or heat cylinder in cross-flow at various R_e numbers with the fundamental equations of hydromechanics and heat transfer. The comparisions of results of numerical solution with the experimental values are quite good.