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RISS 인기검색어
- 검색키워드
- 저자 : Vukcevic, Vuko (검색결과 3 건)
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CFD validation and grid sensitivity studies of full scale ship self propulsion
Jasak, Hrvoje,Vukcevic, Vuko,Gatin, Inno,Lalovic, Igor The Society of Naval Architects of Korea 2019 International Journal of Naval Architecture and Oc Vol.11 No.1
A comparison between sea trial measurements and full-scale CFD results is presented for two self-propelled ships. Two ships considered in the present study are: a general cargo carrier at Froude number $F_n=0:182$ and a car carrier at $F_n=0:254$. For the general cargo carrier, the propeller rotation rate is fixed and the achieved speed and trim are compared to sea trials, while for the car carrier, the propeller rotation rate is adjusted to achieve the 80% MCR. In addition, three grids are used for each ship in order to assess the grid refinement sensitivity. All simulations are performed using the Naval Hydro pack based on foam-extend, a community driven fork of the OpenFOAM software. The results demonstrate the possibility of using high-fidelity numerical methods to directly calculate ship scale flow characteristics, including the effects of free surface, non-linearity, turbulence and the interaction between propeller, hull and the flow field.
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CFD validation and grid sensitivity studies of full scale ship self propulsion
Hrvoje Jasak,Vuko Vukcevic,Inno Gatin,Igor Lalovic 대한조선학회 2019 International Journal of Naval Architecture and Oc Vol.11 No.1
A comparison between sea trial measurements and fullescale CFD results is presented for two self epropelled ships. Two ships considered in the present study are: a general cargo carrier at Froude number Fn ¼ 0:182 and a car carrier at Fn ¼ 0:254. For the general cargo carrier, the propeller rotation rate is fixed and the achieved speed and trim are compared to sea trials, while for the car carrier, the propeller rotation rate is adjusted to achieve the 80% MCR. In addition, three grids are used for each ship in order to assess the grid refinement sensitivity. All simulations are performed using the Naval Hydro pack based on foam-extend, a community driven fork of the OpenFOAM software. The results demonstrate the possibility of using highefidelity numerical methods to directly calculate ship scale flow characteristics, including the effects of free surface, nonelinearity, turbulence and the interaction between propeller, hull and the flow field.
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The Protective Effects of Probiotic Bacteria on Cadmium Toxicity in Rats
Sinisa Djurasevic,Adel Jama,Nebojsa Jasnic,Predrag Vujovic,Milos Jovanovic,Dragana Mitic-Culafic,Jelena Knezevic-Vukcevic,Maja Cakic-Milosevic,Konstantin Ilijevic,Jelena Djordjevic 한국식품영양과학회 2017 Journal of medicinal food Vol.20 No.2
One of the useful properties of probiotic bacteria is their capacity to bind different targets, thus eliminating them through feces. It is supposed that one of these targets could be cadmium, a widespread environmental toxicant that causes various disturbances in biological systems. This study examined the protective effects of probiotic supplementation against cadmium-induced toxicity in the rat. The experiment was conducted in the course of 5 weeks. Animals were divided into four groups: (1) controls, (2) probiotics treated, (3) cadmium treated, and (4) probiotics + cadmium treated. The cadmium concentration was measured in the blood, liver, kidney, and feces, as well as the blood alanine aminotransferase (ALT) and aspartate aminotransferase (AST) as biomarkers of the liver function. Histomorphological changes in the liver and kidney were also determined. Our results revealed that probiotics combined with cadmium increase this metal concentration in feces. As a result, blood, liver, and kidney Cd levels, as well as blood ALT and AST activities were lessened compared to the rat group treated with cadmium only. Besides, probiotics consumed simultaneously with cadmium attenuated histomorphological changes in the liver and kidney caused by cadmium. The rise in lactobacilli number in feces of rats treated simultaneously with cadmium and probiotics results in strong correlation with the increase of Cd concentration in their feces and the decrease of Cd concentration in their blood. We speculate that probiotics actively contribute to cadmium excretion through feces, probably, by its binding to their bacterial cell wall.
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