Reynolds number effect on the concentration and preferential orientation of inertial ellipsoids

Michel, Antoine; Arcen, Boris

doi:10.1103/physrevfluids.6.114305

Cited by 7 publications

(10 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A possible explanation can be obtained by examining the influence of the Reynolds number on the rotation mode of the ellipsoids. In the near-wall region higher values of increase the alignment of the particle major axis with the mean vorticity for (Michel & Arcen 2021 b ). This stronger alignment induces a higher average particle angular velocity.…”

Section: Angular Velocity Statisticsmentioning

confidence: 99%

“…2015 b ). For example, and particles have long rotation periods in the plane (), where they spend extended periods of time spinning with their major axis aligned with the mean flow (Michel & Arcen 2021 b ). These conclusions, drawn up to , can be extrapolated up to .…”

Section: Angular Velocity Statisticsmentioning

confidence: 99%

“…On average, it results in a low mean spanwise angular velocity for high aspect ratios (figure 8 a ). Ellipsoids of relaxation time , however, rotate around one of their minor axis and with a nearly constant angular velocity in the velocity-gradient plane (Michel & Arcen 2021 b ). Their average angular velocity is close to that of the spherical particles, and also close to the mean angular velocity of the fluid (figure 8 c ).…”

Section: Angular Velocity Statisticsmentioning

confidence: 99%

“…This stronger alignment induces a higher average particle angular velocity. For ellipsoids, increasing results in an increase of the mean angle between the particle major axis and the velocity-gradient plane (Michel & Arcen 2021 b ). While a decrease of the mean angular velocity of these particles could be expected, figure 8( c ) suggests only minor changes of with the flow Reynolds number for such ellipsoids.…”

Section: Angular Velocity Statisticsmentioning

confidence: 99%

“…To obtain reliable data, simulations are conducted until the particle distribution has reached a statistically steady state before computing the dispersed phase statistics (Michel & Arcen 2021 a ). Using this methodology, the concentration profiles and preferential orientation of inertial ellipsoids were examined up to (Michel & Arcen 2021 b ). In the present study the dynamical quantities characterizing the interaction of the particles with the turbulent flow are analysed.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Translational and angular velocities statistics of inertial prolate ellipsoids in a turbulent channel flow up to Re_τ = 1000

Michel

Arcen

2023

J. Fluid Mech.

Self Cite

View full text Add to dashboard Cite

Direct numerical simulations of the turbulent flow in a channel are conducted up to $Re_{\tau }=1000$ to examine the influence of the friction Reynolds number on the translational and angular velocities of inertial, prolate ellipsoids. The quadrant distribution of the turbulent events seen by the particles is not significantly affected by the value of $Re_{\tau }$ , but subtle modifications take place, depending on the position in the channel and on the particle relaxation time. Overall, the influence of $Re_{\tau }$ on the first and second statistical moments of the ellipsoids translational velocity is the same as that observed for the fluid velocity. The weak dependence of these statistics to the particle shape previously observed at low Reynolds number remains at higher values of $Re_{\tau }$ . Similarly, the mean and root mean square (r.m.s.) of the angular velocity of the fluid seen by the particles weakly depend on particle shape and they have the same dependence to $Re_{\tau }$ as the angular velocity statistics of the carrier fluid. Particle angular velocity statistics are more strongly affected by the flow Reynolds number due to the evolution of the complex shape and inertia dependent rotation orbits with $Re_{\tau }$ . In the near-wall region the average angular velocity of weakly inertial ellipsoids increases with $Re_{\tau }$ due to their stronger alignment with the mean fluid vorticity. Furthermore, the r.m.s. of the wall-normal component of the angular velocity of more inertial ellipsoids increases with $Re_{\tau }$ owing to the larger fluctuations of the angle between the particle major axis and the velocity-gradient plane.

show abstract

Section: Angular Velocity Statisticsmentioning

confidence: 99%