A front tracking method based on a marching cubes isosurface extractor, which is related filter generating isosurfaces from a structured point set, is provided to achieve sharp resolution for the simulation of non-diffusive interfacial flow. Compared with the traditional topology processing procedure, the current front tracking method is easier to be implemented and presents high performance in terms of computational resources. The numerical tests for 2-D highly-shearing flows and 3-D bubbles merging process are conducted to numerically examine the performance of the current methodology for tracking interfaces between two immiscible fluids The Rayleigh-Taylor （RT） and Richtmyer-Meshkov （RM） instability problems are successfully investigated with the present marching cubes based front tracking method.
通过在界面标识方程中引入人工压缩项,采用基于非结构网格的高分辨率有界格式,编程实现了一类适合模拟复杂界面流问题的VOF(Volume of Fluid)方法.这类VOF方法可以自动处理界面的拓扑演化,无须进行实时的界面重构,提高了计算效率.应用这种基于有界压缩思想的界面流模拟方法,对三维Rayleigh-Taylor不稳定性问题进行了并行模拟.计算结果与相关文献的数据吻合较好,证明了算法的可靠性.研究了密度差和Reynolds数对界面演化的影响,分析了在不同Atwood数下鞍点结构演化规律的异同,对于Reynolds数小于282的界面流问题黏性起着很明显的作用,而Atwood数的影响限于低密度差的界面流动问题,即Atwood数小于0.90的情形.
Supersonic combustion of aviation kerosene is investigated under the flight conditions of Mach number 5 and fuel-air equivalence ratio 0.551.The trajectories of the fuel droplets and the heat/mass transfer between them are simulated by means of discrete phase model(DPM).The k-ω model is chosen for turbulence closure and the non-premixed probability density function(PDF)approach is used to calculate the turbulence-chemistry interaction.The calculated wall static pressure and the total pressure loss coefficient are very close to the experiment results.The strut and cavity devices significantly increase the combustion efficiency.
