Ship's heeling moment due to liquid sloshing in tanks - 3D attitude

• Autorzy: Jachowski J. , Krata P.
• Języki publikacji: EN

Abstrakty

EN

The matter of the paper refers to the dynamic stability of a vessel as an important factor affecting her safety at seaway. Ship 's seakeeping behaviour, which comprises the notion of her stability, is one of the researched key issues leading to the increase in understanding of the safety qualifying factors. Liquid sloshing phenomenon is a result of partly filled tank motions. As a tank moves, it supplies the energy to induce and sustain the fluid motion. The dynamic behaviour of a vessel at seaway is considerably affected by the dynamics of free liquid surfaces, therefore the influence of fluid movement taking place in partly filled tanks on the safety of ship 's exploitation process is emphasized. The paper presents the results of the experimental research and the numerical simulation of the sloshing phenomenon. The research was focused on the computation of the heeling moment affecting the stability of a vessel, especially dynamic effects, which are omitted in obligatory intact ship 's stability regulations nowadays. The experiment performed in the course of the research was carried out in Department of Ship Operation at Gdynia Maritime University. The unique test apparatus was designed and built. It enables to measure dynamic pressures on model tank walls for large oscillation amplitudes, which are characteristic for stormy sea conditions. The numerical simulations of liquid sloshing phenomenon, took into account the viscosity of liquid and the turbulence of considered flows. All the simulations were computed in 3D mode and they provide high accuracy results. The spatial distribution of dynamic pressures on model tank walls enables computation of heeling moment due to liquid sloshing which affects ship 's stability. Further analysis of obtained moments was carried out. The study may be the contribution to the more sophisticated estimation of the ship's stability than it is achieved nowadays.

Słowa kluczowe

EN

safety against capsizing; ship's stability; sloshing; free surface effect

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2009
• Tom: Vol. 16, No. 2
• Strony: 191--197
• Opis fizyczny: Bibliogr. 12 poz., rys.

Twórcy

autor

Jachowski J.

autor

Krata P.

• Gdynia Maritime University Faculty of Navigation, Department of Ship Operation 3 Jana Pawła II Ave. 81-345 Gdynia Phone: [phone],

Bibliografia

• [1] Akyildiz, H., Unal, E., Experimental investigation of pressure distribution on a rectangular tank due to the liquid sloshing, Ocean Engineering, No. 32, pp. 1503-1516, 2005.
• [2] Dongming, Liu, Pengzhi, Lin, A numerical study of three-dimensional liquid sloshing in tanks, Journal of Computational Physics 227 (2008) 3921-3939, 2008.
• [3] Final Report and Recommendations to the 22nd ITTC, The Specialist Committee on Stability, Trondheim, Osaka, Heraklion, St. John’s, Launceston 1996-1999.
• [4] FLUENT Tutorial Guide, Fluent Inc. 2006.
• [5] Francescutto, A., Contento, G., Bifurcations in ship rolling: experimental results and parameter identification technique, Ocean Engineering, No. 26, pp. 1095-1123, 1999.
• [6] Intact Stability Code, International Maritime Organization, London 2002.
• [7] Kim, Y., A Numerical Study on Sloshing Flows Coupled with Ship Motion - The Anti-Rolling Tank Problem, Journal of Ship Research, Vol. 46, pp. 2176-2187, 2002.
• [8] Kobyliński, L., Goal-based Stability Standards, 10th International Ship Stability Workshop, Hamburg, Germany 2007
• [9] Krata, P., Intact ship stability assessment with regard to the sloshing phenomenon in regular rolling condition, Doctor’s thesis, Szczecin University of Technology, Szczecin 2008 (in Polish).
• [10] Krata, P., The comparative study of numerical simulation and experimental research into the areas of maximum dynamic pressure due to sloshing in ship’s double bottom tank, XV-th International Scientific and Technical Conference Nav-Support ‘06, Gdynia 2006.
• [11] Krata, P., Total losses of fishing vessels due to the insufficient stability, Advances in Marine Navigation and Safety of Sea Transportation, Trans-Nav 2007, pp. 555-559,Gdynia 2007.
• [12] Warmowska, M., Jankowski, J., Ship motion affected by moving liquid cargo in holds, Krajowa Konferencja Mechaniki P􀃡ynów, Be􀃡chatów 2006.