Modeling 2D gravity-driven flow in unsaturated porous media for different infiltration rates

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F24%3A00601800" target="_blank" >RIV/68378271:_____/24:00601800 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61989592:15310/24:73627735

Výsledek na webu

<a href="https://hdl.handle.net/11104/0359258" target="_blank" >https://hdl.handle.net/11104/0359258</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.5194/hess-28-4947-2024" target="_blank" >10.5194/hess-28-4947-2024</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Modeling 2D gravity-driven flow in unsaturated porous media for different infiltration rates

Popis výsledku v původním jazyce

The gravity-driven flow in an unsaturated porous medium remains one of the most important unsolved problems in multiphase flow. Sometimes a diffusion-like flow with a uniform wetting front, known as stable flow, is observed, but, at other times, the flow is unstable with distinct preferential pathways. The formation of an unstable wetting front in a porous medium depends on many factors, including the type of porous medium, the initial saturation, and the applied infiltration rate. As the infiltration rate increases, the wetting front first transitions from stable to unstable at low infiltration rates and then from unstable to stable at high infiltration rates. We propose a governing equation and its discretized form, the semi-continuum model, to describe this significant non-monotonic transition. We show that the semi-continuum model is able to capture the influx dependence together with the correct finger width and spacing. Moreover, we demonstrate that the instability of the wetting front is closely related to the saturation overshoot in one dimension. Finally, we show that the flow can still be preferential even when the porous medium is completely wetted.

Název v anglickém jazyce

Modeling 2D gravity-driven flow in unsaturated porous media for different infiltration rates

Popis výsledku anglicky

The gravity-driven flow in an unsaturated porous medium remains one of the most important unsolved problems in multiphase flow. Sometimes a diffusion-like flow with a uniform wetting front, known as stable flow, is observed, but, at other times, the flow is unstable with distinct preferential pathways. The formation of an unstable wetting front in a porous medium depends on many factors, including the type of porous medium, the initial saturation, and the applied infiltration rate. As the infiltration rate increases, the wetting front first transitions from stable to unstable at low infiltration rates and then from unstable to stable at high infiltration rates. We propose a governing equation and its discretized form, the semi-continuum model, to describe this significant non-monotonic transition. We show that the semi-continuum model is able to capture the influx dependence together with the correct finger width and spacing. Moreover, we demonstrate that the instability of the wetting front is closely related to the saturation overshoot in one dimension. Finally, we show that the flow can still be preferential even when the porous medium is completely wetted.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

<a href="/cs/project/EF17_049%2F0008422" target="_blank" >EF17_049/0008422: Partnerská síť v oblasti výzkumu a vývoje zobrazovací a osvětlovací techniky a optoelektroniky pro optický a automobilový průmysl</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Hydrology and Earth System Sciences

ISSN

1027-5606

e-ISSN

1607-7938

Svazek periodika

28

Číslo periodika v rámci svazku

22

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

24

Strana od-do

4947-4970

Kód UT WoS článku

001356368600001

EID výsledku v databázi Scopus

2-s2.0-85209654045