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The relevance of turbulent mixing in estuarine numerical models for two-layer shallow water flow


Krvavica, Nino; Kožar, Ivica; Ožanić, Nevenka
The relevance of turbulent mixing in estuarine numerical models for two-layer shallow water flow // Proceedings: Multiscale Computational Methods for Solids and Fluids / Ibrahimbegović, Adnan ; Brank, Boštjan ; Kožar, Ivica (ur.).
Ljubljana: Faculty of Civil and Geodetic Engineering, Ljubljanja, 2017. str. 175-177 (predavanje, međunarodna recenzija, cjeloviti rad (in extenso), znanstveni)


Naslov
The relevance of turbulent mixing in estuarine numerical models for two-layer shallow water flow

Autori
Krvavica, Nino ; Kožar, Ivica ; Ožanić, Nevenka

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings: Multiscale Computational Methods for Solids and Fluids / Ibrahimbegović, Adnan ; Brank, Boštjan ; Kožar, Ivica - Ljubljana : Faculty of Civil and Geodetic Engineering, Ljubljanja, 2017, 175-177

ISBN
978-961-6884-49-5

Skup
ECCOMAS MSF 2017: 3rd International Conference on Multiscale Computational Methods for Solids and Fluids,

Mjesto i datum
Ljubljana, Slovenija, 20-22.09.2017

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Turbulent mixing ; entrainment ; two-layer flow ; finite volume method ; shallow water flow ; numerical model ; estuaries

Sažetak
The relevance of turbulent mixing in estuarine numerical models for stratified two-layer shallow water flows is analysed in this paper. A one-dimensional numerical model was developed for this purpose by extending an immiscible two-layer model with an additional source term, which accounts for turbulent mixing effects, namely the entrainment of fluid from the lower to the upper layer. The entrainment rate is quantified by an empirical equation as a function of the bulk Richardson number. A finite volume method based on an approximated Roe solver was used to solve the governing coupled system of partial differential equations. A comparison of numerical results with and without entrainment is presented to illustrate the influence of entrainment on both the salt-water intrusion length and lower layer dynamics. Furthermore, one example is given to demonstrate how entrainment terms may help to stabilize the numerical scheme and prevent a possible loss of hyperbolicity. Finally, the model with entrainment is validated by comparing the numerical results to field measurements

Izvorni jezik
Engleski

Znanstvena područja
Građevinarstvo



POVEZANOST RADA


Ustanove
Građevinski fakultet, Rijeka