Characteristics Analysis of the Bottom Pressure Distribution by Depth of Plunge Pool in Shinwol Rainwater Storage and Drainage System

2020 ◽  
Vol 16 (12) ◽  
pp. 85-95
Author(s):  
Jun Oh Oh ◽  
Sang Mi Jun ◽  
Chang Keun Park
Keyword(s):  
Pressure Distribution ◽  
Drainage System ◽  
Bottom Pressure ◽  
Plunge Pool ◽  
Characteristics Analysis

scholarly journals Numerical Simulation of the Hydraulic Performances and Flow Pattern of Swallow-Tailed Flip Bucket

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Lifang Zhang ◽  
Jianmin Zhang ◽  
Yakun Guo ◽  
Yong Peng
Keyword(s):  
Pressure Distribution ◽  
Flow Pattern ◽  
Width Ratio ◽  
Unit Discharge ◽  
Plunge Pool ◽  
Strip Shape ◽  
Pressure Peak ◽  
The Impact ◽  
Discharge Distribution ◽  
Opening Width

In this study, the evolution process of the swallow-tailed flip bucket water nappe entering into the plunge pool is simulated by using the standard k-ε turbulence model and the volume-of-fluid method. The effects of the upstream opening width ratio and downstream bucket angle on the flow pattern, the unit discharge distribution, and the impact pressure distribution are studied. Based on the numerical results, the inner and outer jet trajectories are proposed by using the data. Results show that the longitudinal stretching length decreases with the increase of the upstream opening width ratio and increases with the increase of the downstream bucket angle. The water nappe enters the plunge pool in a long strip shape. Thus, the unit discharge distribution of water nappe entry is consistent with the pressure distribution at the plunge pool bottom. The upstream opening width ratio and downstream bucket angle should be chosen as their intermediate values in order to have a uniform discharge distribution and to reduce the pressure peak at the plunge pool floor, which is effectively to avoid instability and destruction of plunge pool floor.

scholarly journals Impact pressure distribution of inverted arch plunge pool for large discharge

2019 ◽  
Vol 20 (1) ◽  
pp. 209-218
Author(s):  
Yu Wang ◽  
Yaan Hu ◽  
Jinde Gu ◽  
Yu Peng ◽  
Yang Xue
Keyword(s):  
Pressure Distribution ◽  
High Water ◽  
Impact Pressure ◽  
Engineering Practice ◽  
Plunge Pool ◽  
Novel Approach ◽  
Water Head ◽  
Relative Errors ◽  
The Impact ◽  
Large Discharge

Abstract In view of high water head and large discharge in the release structures of hydraulic projects, the inverted arch plunge pool has been put forward due to higher overload capability and stability. Impact pressure on the bottom is a serious concern in design safety precautions, however, the quantitative impact pressure distribution in the inverted arch plunge pool is not yet elucidated. In this study, a novel approach is presented to estimate the impact pressure of an inverted arch plunge pool. Impact pressure characteristics are experimentally investigated under different hydraulic conditions. The results detailed the effect of relative discharge coefficient and the deflection angle relative to the vertical central axis of the plunge pool bottom. The predicting formulas of impact pressure distribution are derived within small relative errors, and the proposed approaches have good applicability in three case studies. The achievements of this investigation are used to define issuance parameters relevant for engineering practice.

Disturbance During Steady and Unsteady Motion of a Two-Dimensional Pressure Distribution

2001 ◽  
Vol 45 (03) ◽  
pp. 165-176 ◽  
Author(s):  
Noriaki Okita ◽  
Iskender Sahin ◽  
Mark C. Hyman
Keyword(s):  
Pressure Distribution ◽  
Finite Depth ◽  
Unsteady Motion ◽  
Wave Resistance ◽  
Two Dimensional ◽  
Bottom Pressure ◽  
Integration Algorithm ◽  
Pressure Profiles ◽  
Principal Value ◽  
Depth Water

A two-dimensional study of flow due to a moving pressure distribution in subcritical Froude numbers over finite-depth water was conducted by a linearized ideal flow approach. A numerical integration algorithm was developed to evaluate the analytical solution given by Cauchy principal-value integrals. The surface elevation, bottom pressure profiles, and wave resistance were computed as functions of speed and water depth. The calculated results agreed well with published values.

scholarly journals Test Result of Bottom Pressure Distribution of STOL Seaplane Model

1968 ◽  
Vol 16 (179) ◽  
pp. 411-417
Author(s):  
Tamotsu NAGAI ◽  
Tatsumi SAKURAI ◽  
Junsei NAGAI
Keyword(s):  
Pressure Distribution ◽  
Bottom Pressure ◽  
Test Result

Flow Due to a Moving Pressure Distribution on Free-Surface With Finite-Depth Bottom

2002 ◽  
Author(s):  
Iskender Sahin ◽  
Noriaki Okita
Keyword(s):  
Free Surface ◽  
Pressure Distribution ◽  
Current Method ◽  
Finite Depth ◽  
Steady State Solution ◽  
Wave Resistance ◽  
Surface Elevation ◽  
Bottom Pressure ◽  
Approximation Techniques ◽  
Pressure Profiles

Surface elevation and dynamic bottom pressure profiles caused by a moving pressure distribution over the free-surface are obtained. A direct numerical integration approach for the linear, two-dimensional, and steady-state solution has been developed. The behavior of the surface elevation and bottom pressure profiles along with wave resistance for increasing Froude number or depth are presented. The agreement of the wave resistance calculations using the profiles obtained by the current method and the expression given by Newman and Poole (1962) indicates that the current method can be used as a reliable tool for prediction as well as validation for other numerical approximation techniques.

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