Thermodynamic Feedback of Sea Spray at Air-Sea Interface

Doctoral Dissertation

Abstract

Sea-spray droplets generated in large quantities under strong winds exchange heat and water vapor with the turbulent airflow, which potentially modifies air-sea heat fluxes. However, questions regarding the appropriate method for modeling the effects of spray on air-sea fluxes still exist due to untested assumptions in existing models and low fidelity in the measurements. In this study, an Eulerian-Langrangian model is implemented to simulate two-way coupled spray droplets in a turbulent flow via direct numerical simulations. While the study is not meant to replicate a real air-sea interface, the fundamental physics underlying turbulence-droplet coupling is the focus. With high-fidelity simulations with mono- and poly-dispersed droplet size distributions, the dissertation covers topics on: (1) the sensitivity of air-sea heat fluxes on various droplet and flow parameters; (2) fundamental assumptions on the microphysics and the poly-dispersity of spray droplets using bulk air-sea algorithms; and (3) potential improvements and corrections to the bulk algorithms on parameterizing spray effects. The findings of this dissertation bring insights on the spray microphysics and feedback effects from a small-scale perspective, which narrows the gap in understanding the spray effects at the air-sea interface for the large-scale modeling community.

Attributes

Attribute NameValues
Author Tianze Peng
Contributor Paola Crippa, Committee Member
Contributor Harindra J. Fernando, Committee Member
Contributor David H. Richter, Research Director
Contributor Diogo Bolster, Committee Member
Degree Level Doctoral Dissertation
Degree Discipline Civil and Environmental Engineering and Earth Sciences
Degree Name Doctor of Philosophy
Banner Code
  • PHD-CEES

Defense Date
  • 2019-08-19

Submission Date 2019-10-21
Subject
  • air-sea interaction

  • turbulent heat transfer

  • computational fluid dynamics

  • sea spray

Language
  • English

Record Visibility Public
Content License
Departments and Units
Catalog Record

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