Numerical simulations of linearly stratified flow past submerged bodies

• Autorzy: Ma W. , Li Y. , Ding Y. , Hu K. , Lan L.

Identyfikatory

DOI

10.2478/pomr-2018-0114

• Języki publikacji: EN

Abstrakty

EN

In this study, a methodology was presented to predict density stratified flows in the near-field of submerged bodies. The energy equation in temperature form was solved coupled with momentum and mass conservation equations. Linear stratification was achieved by the definition of the density as a function of temperature. At first, verifications were performed for the stratified flows passing a submerged horizontal circular cylinder, showing excellent agreement with available experimental data. The ability of the method to cope with variable density was demonstrated. Different turbulence models were used for different Re numbers and flow states. Based on the numerical methods proposed in this paper, the stratified flow was studied for the real scale benchmark DAPRA Suboff submarine. The approach used the VOF method for tracing the free surface. Turbulence was implemented with a k − ω based Detached Eddy Simulation (DES) approach. The effects of submarine speed, depth and density gradient on the free surface wave pattern were quantitatively analyzed. It was shown that, with the increasing of the speed of the submarine, the wavelength and wave height of the free surface wave were gradually increasing. The wave height of the free surface wave was gradually reduced as the submarine’s depth increased. Relative to the speed and submarine depth, the changes of the gradient density gradient have negligible effects on the free surface wave field.

Słowa kluczowe

EN

stratified flow; circular cylinder; internal wave; Suboff; equation of state

• Wydawca: Gdańsk University of Technology, Faculty of Ocean Engineering & Ship Technology
• Czasopismo: Polish Maritime Research
• Rocznik: 2018
• Tom: S 3
• Strony: 68--77
• Opis fizyczny: Bibliogr. 22 poz., rys., tab.

Twórcy

autor

Ma W.

• College of Shipbuilding Engineering Harbin Engineering University Harbin Heilongjiang 150001 China

autor

Li Y.

• College of Ocean Science and Engineering, Shanghai Maritime University, China

autor

Ding Y.

• College of Shipbuilding Engineering Harbin Engineering University Harbin Heilongjiang 150001 China

autor

Hu K.

• College of Shipbuilding Engineering Harbin Engineering University Harbin Heilongjiang 150001 China

autor

Lan L.

• College of Shipbuilding Engineering Harbin Engineering University Harbin Heilongjiang 150001 China

Bibliografia

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).