An Innovative Roof Shape in Liquid Storage Tanks to Reduce Dynamic
                        Sloshing Effects

Purpose The present work involves analytical and experimental investigation of sloshing in a two-dimensional rectangular tank including the effect of porous baffles to control and/or reduce the wave motion in the sloshing tank. The purpose of this study is to assess the analytical solutions of the drag coefficient effect on porous baffles performance to track free surface motion variation in the sloshing tank by comparison with experimental shake table tests under a range of sway excitation. Design/methodology/approach The linear second-order ordinary differential equations for liquid sloshing in the rectangular tank were solved using Newmark’s beta method and obtained the analytical solutions for liquid sloshing with dual vertical porous baffles of full submergence depths in a sway-oscillated rectangular tank following the methodology similar to Warnitchai and Pinkaew (1998) and Tait (2008). Findings The porous baffles significantly reduce wave elevation in the varying filled levels of the tank compared to the baffle-free tank under the range of excitation frequencies. It is observed that the Reynolds number-dependent drag coefficient for porous baffles in the tank can significantly reduce the sloshing elevations and is found to be effective to achieve higher damping compared to the porosity-dependent drag coefficient for porous baffles in the sloshing tank. The analytical model’s response to free surface elevation variations in the sloshing tank was compared with the experiment’s test results. The analytical results matched with shake table test results with a quantitative difference near the first resonant frequency. Research limitations/implications The scope of the study is limited to porous baffles performance under range sway motion and three different filling levels in the tank. The porous baffle performance includes Reynolds number dependent drag coefficient to explore the damping effect in the sloshing tank. Originality/value The porous baffles with low-level porosities in the sloshing tank have many engineering applications where the first resonant mode of sloshing in the tank is more important. The porous baffle drag coefficient is an important parameter to study the baffle’s damping effect in sloshing tanks. Hence, obtained analytical solution for liquid sloshing in the rectangular tank with Reynolds number as well as porosity-dependent drag coefficient (model 1) and porosity-dependent drag coefficient porous baffles (model 2) performance is discussed. The model’s test results were validated using a series of shake table sloshing experiments for three fill levels in the tank with sway motion at various excitation frequencies covering the first four sloshing resonant modes.

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Kopetdag

Saryeva

Petrova

Bezmenova

2020

Earthquakes in Northern Eurasia

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In 2014, seismic monitoring in the Kopetdag region was carried out by a network of 29 seismic stations (20 stationary and nine mobile stations) of the State Seismological Service of the Academy of Sciences of Turkmenistan (SSS ANT), which in April became part of the newly formed Institute of Seismology and Atmo-spheric Physics, ANT. In total, 225 earthquakes with KP≥8.6 were recorded during the year, and focal mechanisms for 24 events were determined. Seismic process intensification continued around the town of Magtymguly. This began in April 2012 with earthquake swarm and continued in 2012–2014 with a series of earthquakes along the borders of the mobile blocks of the earth’s crust in the north of the Iranian plate, at the zone of its contact with Eurasia. On February 13 the strongest earthquake in Turkmenistan in 2014 with KP=12.8 occurred. It was located near the place of the April 2012 swarm. In June 2014 a seriesof more than of more than 2000 earthquakes with KP=4–10 was recorded 60 km east of this earthquake. This indicates a continued seismic activity and the possibility of strong earthquakes here. In the Kopetdag region as a whole, the seismic activity A10 and the seismic energy E released for 2014 reached the background level, after lowering of these parameters noted over the past several years compared to the average annual values for the period 1993–2013.

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An Innovative Roof Shape in Liquid Storage Tanks to Reduce Dynamic Sloshing Effects

Cited by 3 publications

References 18 publications

Sloshing Behavior of Different Fluids in a Cylindrical Tank

Sloshing Behavior of Different Fluids in a Cylindrical Tank

Effect of the drag coefficient on the performance of vertical porous baffles in a sloshing tank

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