Preprints
https://doi.org/10.5194/acp-2021-889
https://doi.org/10.5194/acp-2021-889

  15 Nov 2021

15 Nov 2021

Review status: this preprint is currently under review for the journal ACP.

Evolution of turbulent kinetic energy during the entire sandstorm process

Hongyou Liu, Yanxiong Shi, and Xiaojing Zheng Hongyou Liu et al.
  • Center for Particle-laden Turbulence, Lanzhou University, Lanzhou 730000, PR China

Abstract. An adaptive segmented stationary method for non-stationary signal is proposed to reveal the turbulent kinetic energy evolution during the entire sandstorm process observed at the Qingtu Lake Observation Array. Sandstorm which is a common natural disaster is mechanically characterized by a particle-laden two-phase flow experiencing wall turbulence, with an extremely high Reynolds number and significant turbulent kinetic energy. Turbulence energy transfer is important to the understanding of sandstorm dynamics. This study indicates that large-/very-large-scale coherent structures originally exist in the rising stage of sandstorms with a streamwise kinetic energy of 75 % rather than gradually forming. In addition to carrying a substantial portion of energy, the very-large-scale-motions are active structures with strong nonlinear energy transfer. These structures gain energy from strong nonlinear interaction. As sandstorm evolves, these large structures are gradually broken by quadratic phase coupling, with the energy fraction reducing to 40 % in the declining stage. The nonlinear process in the steady and declining stages weakens and maintains a balanced budget of energy. The systematic bispectrum results provide a new perspective for further insight of sandstorms.

Hongyou Liu et al.

Status: open (until 27 Dec 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-889', Anonymous Referee #1, 01 Dec 2021 reply
    • AC1: 'Reply on RC1', Hongyou Liu, 01 Dec 2021 reply

Hongyou Liu et al.

Data sets

Evolution of turbulent kinetic energy during the entire sandstorm process Hongyou Liu; Yanxiong Shi; Xiaojing Zheng https://zenodo.org/record/5184882

Hongyou Liu et al.

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Short summary
The evolution of turbulent characteristics during the entire sandstorm process has not yet been reported. This study investigates the energy evolution during a sandstorm event. Results indicate that the energetic large structures originally exist in the rising stage of sandstorms rather than gradually forming. These structures gain energy from the nonlinear interaction, but as time evolves, the nonlinear interaction in the steady and declining stages gradually weakens.
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