On condition of comparative study on ascertaining gas well reserves by three ways of material balance, stream material equilibria and volumetric method systematically, the applied condition of every method is present and its effect has been discussed.

In the process of reserve evaluation by SEC criteria,when successive subtraction method being applied, the major focuses are the determination of ratio of variable cost to fixed cost, the careful selection of successive decreasing model and reasonable determination of decline rate; when volumetric method being applied, the major focuses exactly grasp the differences between S.

The key technology of the method is using database of the exploration and development to establish arbitrary area by computer and then calculate petroleum reserves with the volumetric method.

Mathematic model of air two-dimension flowage in the goaf and the finite volume method of this model;

The power-law fluid flow in helical pipes with circular sections was studied by using finite volume method.

For five cooling system design configurations,numerical simulation of the 3D airflow and temperature field was carried out using the standard k-ε turbulent model and finite volume method.