The motion of gravity current is attributed to the difference in density of current and the surrounding environment. If a fluid with a certain density enters the stratified environment so that its density is less than the lower layers and higher than the upper layers, the gravity current would be of intrusive type. Turbidity current is known as an important class of density currents, where the density difference is formed due to the presence of suspended solid particles in the fluid. In this paper, a three-dimensional numerical simulation of stratified intrusive gravity current in the presence of particles is investigated. For this purpose, the open-source OpenFOAM code is implemented for large eddy simulation to model the flow turbulence. According to the obtained results, the addition of particle mass to the intrusive gravity flow in dual symmetric state and flat bed would be followed by reduced velocities of intrusive gravity forward advance and ambient return flow at the bottom of the channel. Moreover, the flow behavior for the case of reverse slopes of 2, 4 and 6° in dual symmetric state in the absence of particles and at a 4° slope in the presence of particles with diameters of 20 and 30 microns has been investigated. Finally, the effect of bed slope on the instability of ambient gravity flow in the absence and presence of particles has explored with the help of local Richardson number. Faster instability in gravity current was achieved as a result of an increase in the bed slope in the absence of particles. Moreover, examining the instability in the 4° bed slope in the presence of particle with diameters of 20 and 30 microns revealed a reduction in local Richardson. Hence, the higher stability of the flow in the presence of particles compared to their absence can be inferred.

重力电流的运动归因于电流密度与周围环境的差异。如果具有一定密度的流体进入分层环境，从而其密度小于下层且高于上层，则重力流将是侵入型的。浊度电流是一类重要的密度电流，其中密度差是由于流体中存在悬浮的固体颗粒而形成的。本文研究了颗粒存在下分层侵入重力流的三维数值模拟。为此，针对大型涡流仿真实现了开源OpenFOAM代码，以对流动湍流进行建模。根据获得的结果，在双重对称状态和平坦的床层中向侵入重力流中添加颗粒质量之后，将减小侵入重力的前移速度和通道底部的环境回流。此外，已经研究了在不存在颗粒的情况下在双对称状态下反向斜率为2、4和6°的情况下的流动行为，在存在直径为20和30微米的颗粒的情况下以4°斜率进行了研究。最后，借助于局部理查森数，研究了在没有和存在颗粒的情况下，床坡度对环境重力流动的不稳定性的影响。在没有颗粒的情况下，由于床坡度的增加，重力流的不稳定性更快。而且，在存在直径为20和30微米的颗粒的情况下，检查4°床坡度的不稳定性表明局部Richardson减小了。因此，可以推断出与不存在颗粒相比，在存在颗粒的情况下流动的更高的稳定性。