Shunbei oilfield belongs to fault reservoir formed by movement of large fracture structures. Longitudinal fracture system and vertical distribution of caves are main storage collective spaces. It is proposed that the pressure change in a cavern is caused by flow and fluctuation. According to this, energy conservation equation is combined with well test theory, and a method is established to explain well test of dissolvable reservoir considering gravity factors. With dimensionless quantity and Laplace transformation of dimensionless equation, bottom pressure on Laplace space is obtained. Plate curve for well test analysis is obtained with Stehfest numerical inversion algorithm. Sensitivity analysis of gravity factors shows that gravity factors affect end of the double logarithmic curve. As gravity factors are obvious, curve characteristics are similar to fixed pressure boundary. A well in Xinjiang oilfield is analyzed, in which the reason why it fell down in the later stage of the curve is explained and the valume of karst cave and other related parameters are given. The results are consistent with actual production situation.

We provide a radiant energy probing method based on single contour integration,including annulus probing and uniform probing.It probes the radiant field of an anisotropy light source and is used as an efficient visualization method.

Some difficulties are analyzed for solving problems of multigroup radiation transfer coupled with material,and an artificial-scattering iteration method is presented by splitting electron energy equation into two equations.The computing method is described and compared with other method.Numerical examples are given.

The transpiration cooling control system of surface thermal protection for bodies of revolution at hypersonic is studied. Not only the critical transpiration quantity equaling to plane case is obtained, but also another smaller second critical transpiration quantity is found. When the transpiration quantity is between of this two critical transpiration quantities, the ablation will appear on the shield surface, but the ablation will stop automatically, and a remainder thickness of shield will be kept at last. Numerical simulation is accomplished and yields all kinds of charactdstic curves. Three methods of ablation control for shield surface are discussed:the controls are for surface temperature, for ablation quantity and for ablation beginning time, the rules for selecting control variable are given.