Coupled systems mechanics

  • 제7권1호
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  • Pages.95-109
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  • 2018
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  • 2234-2184(pISSN)
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  • 2234-2192(eISSN)
테크노프레스 (Techno-Press)
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The relevance of turbulent mixing in estuarine numerical models for two-layer shallow water flow

  • Krvavica, Nino (Department of Hydrology and Hydraulic Engineering, Faculty of Civil Engineering, University of Rijeka) ;
  • Kozar, Ivica (Department of Computer Modeling, Faculty of Civil Engineering, University of Rijeka) ;
  • Ozanic, Nevenka (Department of Hydrology and Hydraulic Engineering, Faculty of Civil Engineering, University of Rijeka)
  • 투고 : 2017.05.10
  • 심사 : 2017.06.29
  • 발행 : 2018.02.25
⟨ 이전 논문 다음 논문 ⟩

초록

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.

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과제정보

연구 과제 주관 기관 : University of Rijeka

참고문헌

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  1. Daily influent variation for dynamic modeling of wastewater treatment plants vol.9, pp.2, 2018, https://doi.org/10.12989/csm.2020.9.2.111