Latest papers in fluid mechanics

Linear theory of particulate Rayleigh-Bénard instability

Physical Review Fluids - Wed, 08/11/2021 - 11:00

Author(s): Suryansh Prakhar and Andrea Prosperetti

Particles falling uniformly through a Rayleigh-Bénard cell have a profound influence on the stability of the system. Mechanically, they exert a stabilizing effect akin to that of the solid phase in a porous medium. Their temperature, however, can markedly affect the undisturbed temperature distribution of the fluid phase with unexpected effects on the stability threshold.

[Phys. Rev. Fluids 6, 083901] Published Wed Aug 11, 2021

Resolvent analysis of stratification effects on wall-bounded shear flows

Physical Review Fluids - Wed, 08/11/2021 - 11:00

Author(s): M. A. Ahmed, H. J. Bae, A. F. Thompson, and B. J. McKeon

The resolvent framework for the Navier-Stokes equations with the Boussinesq approximation was applied to a stratified turbulent boundary layer. The results show that despite using only a very limited range of representative scales, the resolvent model was able to reproduce the relative magnitude of turbulence intensities and the balance of the energy budget as well as provide meaningful analysis of structures in the flow. The resolvent response modes were able to predict the relative variation in turbulence intensities as a function of wall-normal distance and Richardson number (Riτ) for the Riτ under consideration in this study.

[Phys. Rev. Fluids 6, 084804] Published Wed Aug 11, 2021

Competition of overstability and stabilizing effects in viscoelastic thermovibrational flow

Physical Review E - Wed, 08/11/2021 - 11:00

Author(s): Alessio Boaro and Marcello Lappa

Attention is paid to a specific form of thermal convection which encompasses viscoelastic and thermovibrational effects in a single problem or framework. The main objective is understanding the relationship between the phenomenon of overstability and periodic forcing through numerical solution of th...

[Phys. Rev. E 104, 025102] Published Wed Aug 11, 2021


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