Numerical simulations of linearly stratified flow past submerged bodies

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

• Wydawca: -
• Czasopismo: Polish Maritime Research
• Rocznik: 2018
• Tom: 25
• Numer: Special Issue S3
• Opis fizyczny: p.68-77,fig.,ref.

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, Shanghai, 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

• 1. Wang, J., You, Y.X., Hu, T.Q.: The Characteristics of Internal Waves Generated by a Revolution Body in a Stratified Fluid with a Pycnocline. Acta Physica Sinica, 2012, 61(7), Pp. 074-701.
• 2. Ouchi, K.: Recent Trend and Advance of Synthetic Aperture Radar with Selected Topics. Remote Sensing, 2013, 5(2), Pp.716-807.
• 3. Spedding, G.R.: Wake Signature Detection. Annual Review of Fluid Mechanics, 2014, 46, Pp. 273-302.
• 4. Miles, J.W.H.: Lee Waves in a Stratified Flow.Part 2. Semi-Circular Obstacle. Journal of Fluid Mechanics, 1968, 33(4), Pp. 803-814.
• 5. Long, R.R.: Some Aspects of the Flow of Stratified Fluids. Te l l u s, 1955, 7(3), Pp. 341-357.
• 6. Lighthill, M.J.: Hyperbolic Equations and Waves,Springer, New York, 1970.
• 7. Stevenson, T.N.: Some Two-Dimensional Internal Waves in a Stratified Fluid. Journal of Fluid Mechanics, 1968, 33(4), Pp.715-720.
• 8. Stevenson, T.N., Chang, W.L., Laws, P.: Viscous effects in lee waves. Geophysical and Astrophysical Fluid Dynamics, 1979, 13(1), Pp. 41-151.
• 9. Boyer, D.L., Davies, P.A., Fernando, H.: Linearly Stratified Flow Past a Horizontal Circular Cylinder. Philosophical Transactions of the Royal Society of London A: Mathematical, Physical and Engineering Sciences, 1989, 328(1601), Pp. 501-528.
• 10. Xu, Y., Fernando, H.J., Boyer, D.L.: Turbulent Wakes of Stratified Flow Past a Cylinder. Physics of Fluids, 1995, 7(9), Pp. 2243-2255.
• 11. Meunier, P.: Stratified Wake of a Tilted Cylinder. Part 1. Suppression of a Von Kármán Vortex Street. Journal of Fluid Mechanics, 2012, 699, Pp.174-197.
• 12. Bosco, M., Meunier, P.: Three-dimensional instabilities of a stratified cylinder wake. Journal of Fluid Mechanics, 2014, 759, Pp.149-180.
• 13. Winters, K.B., Armi, L.: Hydraulic control of continuously stratified flow over an obstacle.Journal of Fluid Mechanics, 2012, 700, Pp. 502–513.
• 14 . Esmaeilpour, M., Martin, J.E., Carrica, P.M.: Near-Field Flow of Submarines and Ships Advancing in a Stable Stratified Fluid.Ocean Engineering, 2016, 123, Pp.75–95.
• 15. Yu, C., Feng, Z., Jun, Z.: Numerical Simulation of Internal Waves Excited by a Submarine Moving in the Two-Layer Stratified Fluid. Journal of Hydrodynamics,Ser. B, 2006, 18(3), Pp. 330-336.
• 16. Frank, J.M., Alain, P.: International one-atmosphere equation of state of seawater. Deep Sea Research, 1981, 28(6), Pp. 625-629.
• 17. Yaacof, N.A., Qamaruzzaman, N., Yusup, Y.: Comparison method of odour impact evaluation using calpuff dispersion modelling and on-site odour monitoring. Engineering Heritage Journal, 2017, 1(1), Pp. 01-05.
• 18. Yue, X.G., Ashraf, M.A.: Analysis of The Function Relations Between the Depth Of Gap Or Slot And The Speed Of Vibra tion In Millisecond Multiple-Row Holes Blasting. Engineering Heritage Journal, 2018, 2(1), Pp. 01-04.
• 19. Tian, X.C., Li, Q.H., He, C.S., Cai, Y.G., Zhang, Y., Yang, Z.G.: Design and experiment of reciprocating double Track Straight Line Conveyor. Acta Mechanica Malaysia, 2018, 2(2), Pp. 01-04.
• 20. Yan, Z.H.: Modeling and Kinematics Simulation Of Plane Ten-Bar Mechanism Of Warp Knitting Machine Based On Simcape/Multibody. Acta Mechanica Malaysia, 2018, 2(2), Pp. 15-18.
• 21. Yu, Z.C.: An Improved Infrared and Visible Image Fusion Algorithm Based on Curvelet Transform. Acta Electronica Malaysia, 2017, 1(1), Pp. 12-14.
• 22. Zamanian, P., Kasiri, M.: Investigation of Stage Photography In Jee Lee’s Works And Comparing them With The Works Of Sandy Skoglund. Acta Electronica Malaysia, 2018, 2(1), Pp. 01-06.

Identyfikatory

DOI

10.2478/pomr-2018-0114