引水隧洞施工通風(fēng)Euler-Lagrange兩相流大渦模擬.pdf

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3、 日 簽字日期： 年 月 日 II ABSTRACT During the construction of the diversion tunnel of the hydropower project, the quality of construction ventilation will not only affect the construction schedule and qualit

4、y, but also influence the health and safety of the construction personnel. Previous researches on construction ventilation in diversion tunnel only obtain the averaged turbulence physical quantity by Reynolds-Averaged Na

5、vier-Stokes (RANS) model, which could not reveal the complex instantaneous pulsation of turbulence and the micro movement regularities of particles under the evolution of large eddy structures In addition, among the exis

6、ting large eddy simulations of construction ventilation in hydropower project, only few efforts have been devoted to grid quality evaluation and analysis. According to these problems, a large eddy simulation(LES) method

7、of Euler-Lagrange two-phase flow was used to study the ventilation process during diversion tunnel construction. In-depth analysis on the problems mentioned above and the achievements were listed as follows: (1) Consider

8、ing the influence of heat exchange and gas-solid interaction, a large eddy simulation model of the Euler-Lagrange two-phase flow for diversion tunnel ventilation simulation was established. The gas phase was modeled by L

9、ES method and the dynamic Smagorinsky subgrid model was applied. The solid phase was modeled by the discrete random walk model which took into account the effect of turbulent random diffusion in a Lagrange way, and the i

10、nfluence of gas-solid coupling on the particle transport was considered. The discretization scheme of the governing equations was discussed and the PISO algorithm was adopted to solve the discrete equation. (2) A high-re

11、solution grid for large-eddy simulation of water diversion tunnel was built using hybrid grid technique and “O“-grid segmentation technique. And grid-sensitivity analysis was carried out. The grid evaluation index LES_IQ

12、k based on Richardson extrapolation was discussed and the index was used to evaluate the quality of the established grid. The results showed that the ratio of turbulent kinetic energy that can be solved by the establishe