KDI: Direct Numerical Simulation and Modeling of Solid-Liquid Flows

[873236] daniel Joseph & Yousef saad这个项目的目的是开发并行算法来处理一类与液体中固体粒子动力学相关的多尺度问题。重点是对足够多的粒子的相互作用进行全三维直接数值模拟，成千上万的粒子，这样就可以推断出集体行为。这是建立在以前的研究支持下的NSF-HPCC大挑战组奖，其中二维模拟已经成功完成。质点运动器算法使用一种组合的弱公式，其中流体和质点运动方程被组合成一个方程集，其中质点和流体之间的相互作用力相互抵消，从而避免了对力的显式计算。扩展到三维以及增加粒子数量以获得可靠的样本量，需要对先决条件和求解器进行重大修改，这将定义计算流体力学的新方向。这里讨论的多尺度现象是化学加工工业和石油勘探与开采的基础。因此，将特别考虑将模拟结果呈现为工业可以理解和使用的形式。例如，将加强与STIM-LAB（一组油气行业合作伙伴）的合作，以在NSF支持下进行的研究为基础，开发3D设计软件包。

9873236Daniel Joseph & Yousef SaadThe purpose of this project is to develop parallel algorithms to treat a class of multiscale problems associated with solid particle dynamics in liquids. The focus is on full three-dimensional direct numerical simulation of the interactions of sufficiently large number of particles, thousands of particles, so that collective behavior might be inferred. This builds upon the previous research supported under the NSF-HPCC Grand Challenge Group Award where two-dimensional simulation had been successfully accomplished.The particle movers algorithm uses a combined weak formulation in which the fluid and particle equations of motion are combined into one single equation set in which the interaction forces between the particles and fluid cancel, circumventing the need for explicit calculation of forces. Extension to three-dimensions as well as increasing the number of particles in order to obtain reliable sample size, requires a major overhaul of preconditions and solvers which will define new directions for computational fluid mechanics.The multiscale phenomena addressed here are fundamental to the chemical process industry and oil exploration and recovery. Therefore, special considerations will be given to present the simulation results into forms which can be understood and used by industry. For example, collaboration with STIM-LAB a group of industrial partners in the oil and gas will be strengthened to develop a 3D design software package based on the research conducted under NSF support.