Wave-driven porewater and solute circulation through rippled elastic sediment under highly transient forcing

M. Bayani Cardenas; Houshuo Jiang

doi:10.1215/21573698-1151658

Control of self-excited thermoacoustic oscillations using transient forcing, hysteresis and mode switching

Combustion and Flame ◽

10.1016/j.combustflame.2019.01.013 ◽

2019 ◽

Vol 202 ◽

pp. 262-275 ◽

Cited By ~ 15

Author(s):

Yu Guan ◽

Wei He ◽

Meenatchidevi Murugesan ◽

Qiang Li ◽

Peijin Liu ◽

...

Keyword(s):

Mode Switching ◽

Transient Forcing ◽

Thermoacoustic Oscillations

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Open Loop Transient Forcing of an Axisymmetric Bluff Body Wake

46th AIAA Aerospace Sciences Meeting and Exhibit ◽

10.2514/6.2008-595 ◽

2008 ◽

Cited By ~ 2

Author(s):

Stefan Siegel ◽

Jürgen Seidel ◽

Kelly Cohen ◽

Selin Aradag ◽

Thomas McLaughlin

Keyword(s):

Bluff Body ◽

Open Loop ◽

Transient Forcing ◽

Bluff Body Wake

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Transient forcing effects on mixing of two fluids for a stable stratification

Water Resources Research ◽

10.1002/2016wr019181 ◽

2016 ◽

Vol 52 (9) ◽

pp. 7178-7197 ◽

Cited By ~ 6

Author(s):

María Pool ◽

Marco Dentz ◽

Vincent E. A. Post

Keyword(s):

Stable Stratification ◽

Two Fluids ◽

Transient Forcing

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Aerosol effects on shallow cumulus cloud fields in idealised and realistic simulations

10.5194/egusphere-egu2020-18231 ◽

2020 ◽

Author(s):

George Spill ◽

Philip Stier ◽

Paul Field ◽

Guy Dagan

Keyword(s):

Large Scale ◽

Trade Wind ◽

Quasi Equilibrium ◽

Cumulus Cloud ◽

Shallow Convection ◽

Shallow Cumulus ◽

Synoptic Conditions ◽

Large Eddy ◽

Transient Forcing ◽

Periodic Domains

Shallow cumulus clouds interact with their environment in myriad significant ways, and yet their behavour is still poorly understood, and is responsible for much uncertainty in climate models. Improving our understanding of these clouds is therefore an important part of improving our understanding of the climate system as a whole.Modelling studies of shallow convection have traditionally made use of highly idealised simulations using large-eddy models, which allow for high resolution, detailed simulations. However, this idealised nature, with periodic boundaries and constant forcing, and the quasi-equilibrium cloud fields produced, means that they do not capture the effect of transient forcing and conditions found in the real atmosphere, which contains shallow cumulus cloud fields unlikely to be in equilibrium.&#160;Simulations with more realistic nested domains and forcings have previously been shown to have significant persistent responses differently to aerosol perturbations, in contrast to many large eddy simulations in which perturbed runs tend to reach a similar quasi-equilibrium.&#160;Here, we further this investigation by using a single model to present a comparison of familiar idealised simulations of trade wind cumuli in periodic domains, and simulations with a nested domain, whose boundary conditions are provided by a global driving model, able to simulate transient synoptic conditions.&#160;The simulations are carried out using the Met Office Unified Model (UM), and are based on a case study from the Rain In Cumulus over the Ocean (RICO) field campaign. Large domains of 500km are chosen in order to capture large scale cloud field behaviour. A double-moment interactive microphysics scheme is used, along with prescribed aerosol profiles based on RICO observations, which are then perturbed.We find that the choice between realistic nested domains with transient forcing and idealised periodic domains with constant forcing does indeed affect the nature of the response to aerosol perturbations, with the realistic simulations displaying much larger persistent changes in domain mean fields such as liquid water path and precipitation rate.&#160;

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The Impact of Wind Gusts on the Ocean Thermal Skin Layer by Capillary-Gravity Waves

10.5194/egusphere-egu2020-22561 ◽

2020 ◽

Author(s):

Christopher J Zappa ◽

Nathan Laxague ◽

Sophia Brumer ◽

Steven Anderson

Keyword(s):

Infrared Imaging ◽

Wind Waves ◽

Ocean Surface ◽

Skin Layer ◽

Wind Gust ◽

Thermal Infrared Imaging ◽

Wind Gusts ◽

Transient Forcing ◽

The Impact ◽

Depth Water

The thermodynamic and emissive properties of the ocean thermal skin layer are crucial contributors to air-sea heat flux. In order to properly observe ocean surface temperature without disturbing any delicate fluid mechanical processes, thermal infrared imaging is often used. However, wind impacting the ocean surface complicates the extraction of meaningful information from thermal imagery; this is especially true for transient forcing phenomena such as wind gusts. Here, we describe wind gust-water surface interaction through its impact on skin layer thermal and emissive properties. Two key physical processes are identified: (1) the growth of centimeter-scale wind waves, which increases interfacial emissivity and (2) microscale wave breaking and shear, which mix the cool skin layer with warmer millimeter-depth water and increase the skin temperature. As more observations are made of air-sea interaction under transient forcing, the full consideration of these processes becomes increasingly important.

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