Effect of Shear-Induced Lift on Particle Motion and Turbulence Modulation in Fully Developed Compressible Turbulent Channel Flow

Particle-laden flows exist widely in natural phenomena and engineering applications. Particle-laden turbulent channel flow is essential for understanding the interaction between particles and wall-bounded turbulence, which sheds light on various problems such as the design of turbo-machine and the evolution of sandstorm. However, the influence of shear-induced lift on particle-turbulence interaction remains unclear. Therefore, the two-way coupling particle-laden compressible gravity-free turbulent channel flow is simulated by point-particle direct numerical simulation (PP-DNS). We examine first the influence of Saffman lift on particle velocity, turbophoresis and turbulence modulation. It is noticed that the Saffman lift will 1) augment near-wall particle velocity, 2) reduce turbophoresis and 3) increase turbulence attenuation. Then, we consider the effect of different feedback methods, i.e., Particle-in-Cell (PIC) and projection methods. It turns out that both methods show few influences on fluid statistics, but the projection method gives a stronger turbophoresis and a smaller particle stream-wise velocity within buffer region.