Can I read Dynamics of particle-laden turbulent Couette flow. Part2: Modified fluctuating force model (M-FFS) on EtoBox?

Dynamics of particle-laden turbulent Couette flow. Part2: Modified fluctuating force model (M-FFS) by Ghosh, Swagnik; Goswami, Partha Sarathi is a scholarly article available to read on EtoBox.

What is Dynamics of particle-laden turbulent Couette flow. Part2: Modified fluctuating force model (M-FFS) about?

Two-way coupled DNS simulation of particle-laden turbulent Couette-flow [1], in the volume fraction regime $\phi>10^{-4}$, showed a discontinuous decrease of turbulence intensity beyond a critical volume fraction $\phi_{cr}\sim7.875\times10^{-4}$. Due to the presence of high inertial particles, the drastic reduction of shear production of turbulence is found to be the main cause for the discontinuous attenuation of turbulence. In this article, particle-phase statistics is explored. The two-way coupled DNS reveal that the mean-square velocity profiles in cross-stream (y) and span-wise (z) directions are flat and increase with $\phi$ as the higher frequency of collision helps in transferring streamwise momentum to span-wise and wall-normal directions. Whereas, streamwise fluctuations decrease and tend become flatter with increase in loading. In the regime with $\phi>\phi_{cr}$, the particle velocity fluctuations drive the fluid phase velocity fluctuations. Additionally it is observed that one-way coupled DNS and Fluctuating Force Simulation (FFS) [2] are capable to predict the particle phase statistics with reasonable accuracy in the regime $\phi<\phi_{cr}$ where wall-particle collis

Author

Ghosh, Swagnik; Goswami, Partha Sarathi

Published

2022

Language

EN