Virtual MEchanics GAthering -MEGA- Seminar: Rotation of inertial particles in homogenous isotropic turbulence


Event details

Date 22.10.2020
Hour 16:1517:30
Speaker Ankur Bordoloi, Environmental Fluid Mechanics, UNIL
Zoom: Room Passcode: 349948
Category Conferences - Seminars
Rotation of inertial particles in homogenous isotropic turbulence, by Ankur Bordoloi, Environmental Fluid Mechanics, UNIL

The physics of motion of dispersed particles in turbulent flow is of importance to many natural and industrial processes, such as aquatic ecology, sediment transport, water treatment, and paper making. The dispersed matter in these processes occupies a wide space in the size spectrum, varying from sub-Kolmogorov scale to sizes greater than the largest scales of turbulence. The shape of particles in these suspensions also varies greatly, and few have the oft-assumed simplicity of spheres. The kinematics of small (sub-Kolmogorov) spherical particles in turbulence are relatively well understood. Of interest to this research is the rotational dynamics of non-spherical particles that are larger than the Kolmogorov length. Through various experiments, we measure the spinning and tumbling motions of long cylindrical particles (i.e. length/diameter ³1). Contrary to popular assumptions based on K41 theory, the spinning rates of these particles are larger than the tumbling rate. These results indicate that these large particles may preferentially align with the large structures of turbulence.

Dr. Ankur Bordoloi obtained his PhD (2014) in Aerospace Engineering & Mechanics from the University of Minnesota. He is currently a postdoc in the Institute of Earth Sciences at UNIL. Prior to his current position, Ankur has done postdocs at University of California, Berkeley and the Los Alamos National laboratory. Over his academic and research career, Ankur has worked on several problems related to multiphase flows (droplet dynamics, particle-turbulence interactions, particle-shock wave interactions, plume sedimentation etc.) that have applications in geophysical flows, marine biology, environmental science, biomedical design, and aerospace engineering.

For more information: about his research:

Practical information

  • General public
  • Free


  • MEGA.Seminar Organizing Committee



Solids Structures Fluids