Computational Modelling of Sloshing in Liquefied Natural Gas Tank

2017 ◽  
Author(s):  
Shen Yang Foong ◽  
Yuting Jin ◽  
Shuhong Chai ◽  
Christopher Chin ◽  
Hayden Marcollo
Keyword(s):  
Natural Gas ◽  
Computational Modelling ◽  
Pressure Profile ◽  
Liquefied Natural Gas ◽  
Computational Method ◽  
Navier Stokes ◽  
Impulsive Loads ◽  
2D And 3D ◽  
Made In ◽  
Modelling Approach

Sloshing in the tank of liquefied natural gas (LNG) carriers has recently attracted immense attention due to the rise in demand for LNG transportation. It occurs in partially filled tanks and is capable of inflicting severe damage to the tank’s interior. One effective method to dampen sloshing activities is by introducing baffles into the tank. In this paper, the nature of sloshing has been investigated using finite volume based unsteady Reynolds Averaged Navier-Stokes (URANS) method. Good correlation was achieved between the results obtained from the presented computations and past studies, demonstrating the feasibility of the established numerical modelling approach. Employing similar computational method, two-dimensional (2D) sloshing computations were performed for different baffle additions at varying filling levels. Observations were made in the baffled tanks where an increase in the number of baffles would cause the sloshing activities to magnify if the baffle height was significantly lower than the filling level. When comparing the 2D and 3D computational results, close resemblance of the average pressure profile and maximum impulsive loads had suggested that 2D simulations are feasible to model sloshing induced loads in a 3D tank.

A multi-fidelity modelling approach for evaluation and optimization of wing stroke aerodynamics in flapping flight

2013 ◽  
Vol 721 ◽  
pp. 118-154 ◽  
Author(s):  
Lingxiao Zheng ◽  
Tyson L. Hedrick ◽  
Rajat Mittal
Keyword(s):  
Parameter Space ◽  
Computational Models ◽  
Computational Modelling ◽  
Element Model ◽  
Flapping Wing ◽  
Navier Stokes ◽  
Specific Flow ◽  
Wing Stroke ◽  
Modelling Approach ◽  
Blade Element

AbstractThe aerodynamics of hovering flight in a hawkmoth (Manduca sexta) are examined using a computational modelling approach which combines a low-fidelity blade-element model with a high-fidelity Navier–Stokes-based flow solver. The focus of the study is on understanding the optimality of the hawkmoth-inpired wingstrokes with respect to lift generation and power consumption. The approach employs a tight coupling between the computational models and experiments; the Navier–Stokes model is validated against experiments, and the blade-element model is calibrated with the data from the Navier–Stokes modelling. In the first part of the study, blade-element and Navier–Stokes modelling are used concurrently to assess the predictive capabilities of the blade-element model. Comparisons between the two modelling approaches also shed insights into specific flow features and mechanisms that are lacking in the lower-fidelity model. Subsequently, we use blade-element modelling to explore a large kinematic parameter space of the flapping wing, and Navier–Stokes modelling is used to assess the performance of the wing-stroke identified as optimal by the blade-element parameter survey. This multi-fidelity optimization study indicates that even within a parameter space constrained by the animal’s natural flapping amplitude and frequency, it is relatively easy to synthesize a wing stroke that exceeds the aerodynamic performance of the hawkmoth wing stroke. Within the prescribed constraints, the optimal wing stroke closely approximates the condition of normal hover, and the implications of these findings on hawkmoth flight capabilities as well as on the issue of biomimetic versus bioinspired design of flapping wing micro-aerial vehicles, are discussed.

Liquefied natural gas in China

2000 ◽  
Author(s):  
Dean Girdis ◽  
Stratos Tavoulareas ◽  
Ray Tomkins
Keyword(s):  
Natural Gas ◽  
Liquefied Natural Gas

Analysis of standardization documentation in the field of liquefied natural gas

2018 ◽  
pp. 59-61
Author(s):  
V.A. Yasashin ◽  
◽  
E.S. Gadylshina ◽  
A.S. Bolotokov ◽  
◽  
...  
Keyword(s):  
Natural Gas ◽  
Liquefied Natural Gas

HIGH-RESPONSE COMPLEX FOR ANALYZING DROPLETS AND VAPORS IN AEROSOL CLOUDS FORMED IN THE ATMOSPHEREDUE TO LIQUID DISPERSION

2020 ◽  
Author(s):  
A. V. ZAGNIT'KO ◽  
◽  
N. P. ZARETSKIY ◽  
I. D. MATSUKOV ◽  
V. V. PIMENOV ◽  
...  
Keyword(s):  
Remote Control ◽  
Natural Gas ◽  
Diesel Fuel ◽  
Liquefied Natural Gas ◽  
High Response ◽  
Liquid Dispersion ◽  
Diagnostic Complex ◽  
Response Complex

The high-response diagnostic complex for remote control and analyses of droplets and vapors of mazut, oil, gasoline, kerosene, diesel fuel and liquefied natural gas in the clouds and turbulent aerosolflows in the atmosphere with volume up to 107 m3 is described.

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