CAJ | 학술논문

采用计算流体力学和离散单元方法对二维提升管气固流动过程进行了数值模拟.采用大涡模拟方法模拟气体湍流流动,采用离散单元方法模拟颗粒碰撞过程.基于网格内流体能量守衡,提出了动能加权平均法,实现Euler坐标与Lagrange坐标的耦合与分解.模拟计算得到的瞬态流型揭示了颗粒聚团的合并和破碎过程及颗粒的详细运动行为,定性地揭示了提升管内气体-颗粒两相流动过程.
채용계산류체역학화리산단원방법대이유제승관기고류동과정진행료수치모의.채용대와모의방법모의기체단류류동,채용리산단원방법모의과립팽당과정.기우망격내류체능량수형,제출료동능가권평균법,실현Euler좌표여Lagrange좌표적우합여분해.모의계산득도적순태류형게시료과립취단적합병화파쇄과정급과립적상세운동행위,정성지게시료제승관내기체-과립량상류동과정.
The flow behavior of particles in a two-dimensional riser was modeled with the combination of the discrete element method (DEM) and computational fluid dynamics(CFD).Gas turbulence was modeled by large eddy simulation (LES), and DEM was used to model the collision of particles.A transport energy weighted averaging approach was proposed to coupling the gas phase in the Euler coordinate with the particles in the Lagrange coordinate on the basis of the balance of the transport kinetic energy.Simulated results showed that the clusters grew in size and increased in number along the flow direction.A core-annulus flow structure with a dilute phase in the center and a dense phase near the walls was formed in the riser.Simulated results showed the formation and break-up of clusters and the motion of particles in the riser.Simulated results were in agreement with available experimental data.However, the comparison with different models of drag force remained rather limited.More detailed simulations are required to get a more complete validation.