Turbulent Channel Flow of Suspensions over Porous Media.

POSTER

Abstract

In this study, we discuss the flow of turbulent suspension of non-Brownian and non-colloidal, rigid spherical particles in a Newtonian fluid over a porous wall. We consider suspension flows where the volume fraction ranges changes from 0 to 0.2 with different wall porous permeability, while porosity is constant at 0.6. Direct numerical simulations (DNS) with an immersed boundary method (IBM) are employed to resolve the particles and flow phase and coupled with the volume-averaged Navier-Stokes (VANS) to solve the flow within the porous layer. The results show that the mean velocity profiles are significantly altered by the presence of the particles in the fluid region when increasing the permeability of the porous layer. At the highest volume fraction investigated here, 0.2, the velocity fluctuation intensities and the Reynolds shear stress are found to decrease. The overall drag is found to grow with the volume fraction.

*This work has been supported partially by the National Science Foundation award #1854376 and partially by the Army Research Office Award No. W911NF-18-1-0356 to SA and PM.

Authors

  • Seyedmehdi Abtahi

    • The University of Illinois at Chicago, Chicago, USA

  • Marco E. Rosti

    • Complex Fluids and Flows Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna-son, Okinawa 904-0495, Japan

  • Luca Brandt

    • Linné Flow Centre and SeRC (Swedish e-Science Research Centre), KTH Mechanics, S-100 44 Stockholm, Sweden
    • KTH Royal Institute of Technology
    • Department of Engineering Mechanics- KTH Royal Institute of Technology
    • Linn´e Flow Centre and SeRC, Department of Engineering Mechanics, KTH, Stockholm, Sweden
    • Department of Mechanics - KTH Royal Institute of Technology

  • Parisa Mirbod

    • University of Illinois at Chicago
    • The University of Illinois at Chicago, Chicago, USA