Numerical Investigation on Critical Submerged Depth During Draining From Cylindrical Tanks

2016 ◽  
Author(s):  
Liu Shi-wen ◽  
Zhou Jie ◽  
Huang Wei ◽  
Cheng Xiang
Keyword(s):  
Froude Number ◽  
Diameter Ratio ◽  
Nuclear Engineering ◽  
Initial Water ◽  
Design Work ◽  
Liquid Storage ◽  
Liquid Storage Tank ◽  
Cylindrical Tanks ◽  
Engineering Practices ◽  
Strong Vortex

Gas ingestion arises from free surface dip during draining from liquid storage tank does serious damage to the nuclear engineering practices, which should be considered in the design work. In this article, numerical simulations of transient process of draining from cylindrical tanks have been conducted with volume-of-fluid (VOF) method, by using the commercial CFD code FLUENT14.5. The relation between critical submerged depth and the Froude number has been investigated, then the influence of different factors on critical submerged depth also has been discussed. The results show that the Jain’s empirical formula are available to estimate the critical submerged depth flow with weak vortex in the condition of high diameter ratio and high initial water level. Moreover, the initial strong vortex significantly increase the critical submerged depth, while the surface tension has pretty small effects on the critical submerged depth when the Froude number is large.

Generation and Use of Simplified Uplift Shape Functions in Unanchored Cylindrical Tanks

1996 ◽  
Vol 118 (3) ◽  
pp. 278-286 ◽  
Author(s):  
D. T. Lau ◽  
X. Zeng
Keyword(s):  
Mathematical Model ◽  
Bottom Plate ◽  
Shape Functions ◽  
Liquid Storage ◽  
Tilt Condition ◽  
Liquid Storage Tank ◽  
Cylindrical Tanks ◽  
Relationship Of ◽  
The Relationship ◽  
Simplified Mathematical Model

This paper presents a simplified mathematical model for modeling the flexible bottom plate in an unanchored cylindrical liquid storage tank partially uplifted under the static tilt condition. In this model, the cylindrical tank is divided into substructures according to the deformation-resistant mechanisms involved. The modeling of each substructure is based on the Ritz formulation. Numerical results are presented and compared with reported experimental measurements. The results show that the simplified mathematical model is efficient. Practical and accurate results can be obtained using the model leading to a better understanding of the uplift mechanism. The relationship of the uplift behavior with the static tilt angle is also presented and discussed.

scholarly journals Physical Modeling of Landward Scour Due to Tsunami Bore Overtopping Seawall

2018 ◽  
Vol 203 ◽  
pp. 01003
Author(s):  
Raidan Maqtan ◽  
Badronnisa Yusuf ◽  
Saiful Bahri Hamzah
Keyword(s):  
Froude Number ◽  
Laboratory Experiments ◽  
Negative Relationship ◽  
Structural Performance ◽  
Flow Depth ◽  
Initial Water ◽  
Field Surveys ◽  
Strong Positive Relationship ◽  
Strong Negative Relationship ◽  
Wave Forms

many of the post tsunami field surveys which conducted by researchers revealed that, the failure due to scour at the landward toe of the seawall due to overtopping of tsunami wave forms one of the important types of coastal defence structures failure and constitutes one of the biggest threats to their structural performance. This study was intended to investigates the scour profile induced by tsunami bores at the landward toe of the vertical seawall and to discuss the effects of the parameters; tide level, incident bore Froude number Fb, incident bore height Hb, overtopping flow Froude number Fo, and overtopping flow depth Ho on the maximum scour depth induced at the landward toe of the seawall. A set of laboratory experiments were conducted at National Hydraulic Research Institute of Malaysia (NAHRIM) with the tichnique of dam break to generate the bore like tsunami. The experiments showed that the initial water level upstream of the seawall has a significant effect on the scour profile and there is a strong negative relationship exists with Froude number of the incident bore and a strong positive relationship exists with Froude number of the overtopping flow depth above the crest of the seawall.

The effect of manifold in liquid storage tank applied to solar combisystem

2015 ◽  
Vol 29 (3) ◽  
pp. 1289-1295 ◽  
Author(s):  
Hyo Seok Son ◽  
Chul Kim ◽  
Douglas Reindl ◽  
Hiki Hong
Keyword(s):  
Storage Tank ◽  
Liquid Storage ◽  
Liquid Storage Tank

scholarly journals Damage Identification Based on Adding Mass for Liquid–Solid Coupling Structures

2020 ◽  
Vol 10 (7) ◽  
pp. 2312
Author(s):  
Jilin Hou ◽  
Haiyan Wang ◽  
Dengzheng Xu ◽  
Łukasz Jankowski ◽  
Pengfei Wang
Keyword(s):  
Experimental Data ◽  
Cantilever Beam ◽  
Storage Tank ◽  
Damage Identification ◽  
Local Damage ◽  
Fundamental Theory ◽  
Attached Mass ◽  
Experimental Conditions ◽  
Liquid Storage ◽  
Liquid Storage Tank

Damage identification for liquid–solid coupling structures remains a challenging topic due to the influence of liquid and the limitation of experimental conditions. Therefore, the adding mass method for damage identification is employed in this study. Adding mass to structures is an effective method for damage identification, as it can increase not only the experimental data but also the sensitivity of experimental modes to local damage. First, the fundamental theory of the adding mass method for damage identification is introduced. After that, the method of equating the liquid to the attached mass is proposed by considering the liquid–solid coupling. Finally, the effectiveness and reliability of damage identification, based on adding mass for liquid–solid coupling structures, are verified through experiments of a submerged cantilever beam and liquid storage tank.

Wind Effects on Sloshing of a Floating Roof in a Cylindrical Liquid Storage Tank

2008 ◽  
Author(s):  
Tetsuya Matsui ◽  
Yasushi Uematsu ◽  
Koji Kondo ◽  
Takuo Wakasa ◽  
Takashi Nagaya
Keyword(s):  
Storage Tank ◽  
Wind Tunnel Test ◽  
Dynamic Interaction ◽  
Measured Data ◽  
Wind Pressure ◽  
Wind Loads ◽  
Linear Potential ◽  
Liquid Storage ◽  
Liquid Storage Tank ◽  
Linear Potential Theory

Sloshing of a floating roof in an open-topped cylindrical liquid storage tank under wind loads is investigated analytically. Wind tunnel test in a turbulent boundary layer is carried out to measure the wind pressure distributing over the roof surface. The measured data for the wind pressure is then utilized to predict the wind-induced dynamic response of the floating roof, which is idealized herein as an isotropic elastic plate of uniform stiffness and mass. The dynamic interaction between the liquid and the floating roof is taken into account exactly within the framework of linear potential theory. Numerical results are presented which illustrate the significant effect of wind loads on the sloshing response of the floating roof.

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