Physical Model Implementation Case Study

The occurrence and the effects of hydraulic jump instabilities on a natural river confluence in a small river basin in Liguria (Italy) is here investigated. Hydraulic jump instability has been extensively studied in controlled and simplified laboratory rectangular flumes. In the present study, a scaled physical model of the Chiaravagna River and Ruscarolo Creek confluence has been used, retaining the realistic geometry of the reaches. This reach has been subject to frequent floods in the last twenty years and the entire area of the confluence has been redesigned to decrease the flood risk. A series of experiments has been performed varying the discharge on the two reaches and the geometrical configurations. Free surface levels and two dimensional horizontal velocities have been measured in several positions along the physical model. The analysis of the water levels and velocities reveals that oscillations characterised by large amplitude and low frequency occur under particular hydraulic conditions. These oscillations have been found to be triggered by the hydraulic jump toe instability of the smallest reach of the confluence. Aiming at reducing the amplitude of the oscillations, which can be of the order of the flow depth, possible constructive solutions have been tested to control or damp the oscillations. Indeed, the insertion of a longitudinal dyke at the confluence has proven to be an effective solution to limit the amplitude of the transversal oscillations.

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Hydraulic Physical Model of Debris Flow for Malaysia Case Study

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/374/1/012067 ◽

2018 ◽

Vol 374 ◽

pp. 012067

Author(s):

M R R Mohd Arif Zainol ◽

M K Awahab

Keyword(s):

Debris Flow ◽

Physical Model

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Seismic wave propagation in porous and layered medium ‐ a case study of a physical model based on a Daqing reservoir, China

10.1190/1.3255805 ◽

2009 ◽

Author(s):

Bona Wu ◽

Shangxu Wang ◽

Xuri Huang

Keyword(s):

Wave Propagation ◽

Physical Model ◽

Seismic Wave ◽

Layered Medium ◽

Seismic Wave Propagation ◽

Model Based

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Parameters affecting the thickness of bentonite cake in cutoff wall construction: case study and physical modeling

Canadian Geotechnical Journal ◽

10.1139/t04-090 ◽

2005 ◽

Vol 42 (2) ◽

pp. 646-654 ◽

Cited By ~ 16

Author(s):

Abbas Soroush ◽

Mohammad Soroush

Keyword(s):

Physical Model ◽

Physical Model Test ◽

Test Results ◽

Cutoff Wall ◽

Bentonite Slurry ◽

Cutoff Walls ◽

Plastic Concrete ◽

Wall Construction ◽

Using Data

Concrete cutoff walls are usually constructed using a panel-by-panel technique in which primary panels are constructed with space between them and then secondary panels are constructed and inserted in the spaces. A small thickness of residual bentonite cake from the slurry used during excavation usually remains in the construction joints between adjacent primary and secondary panels. The thickness of such bentonite-filled joints should be minimized in terms of the performance of the cutoff wall in controlling seepage. This research experimentally evaluated the effects of a number of design and construction parameters on the thickness of the bentonite cake using data from a case study (the cutoff wall of Karkheh Dam). A physical model test was developed and a number of tests were conducted. The test results showed that parameters such as age of the primary panels, cement content of the slurry, quantity of additives in the slurry, and circulation versus noncirculation of the slurry are responsible for the thickness of the bentonite cake. The results are presented and analyzed.Key words: cutoff wall, plastic concrete, bentonite slurry, bentonite cake, physical model.

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Physical model to investigate the effect of the thermal discharge on the mixing zone (Case Study: North Giza Power Plant, Egypt)

Alexandria Engineering Journal ◽

10.1016/j.aej.2012.12.003 ◽

2013 ◽

Vol 52 (2) ◽

pp. 175-185 ◽

Cited By ~ 5

Author(s):

Entesar A.S. El-Ghorab

Keyword(s):

Power Plant ◽

Physical Model ◽

Mixing Zone ◽

Thermal Discharge

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A CASE STUDY ON STABILISER FIN-HULL INTERACTION USING CFD AND MODEL EXPERIMENTS

The International Journal of Maritime Engineering ◽

10.5750/ijme.v157ia4.963 ◽

2021 ◽

Vol 157 (A4) ◽

Author(s):

K A Bhosale ◽

J T Duffy

Keyword(s):

Fluid Dynamics ◽

Computational Fluid Dynamics ◽

Physical Model ◽

Free Stream ◽

Angle Of Attack ◽

Model Experiments ◽

Stream Condition ◽

Hull Forms ◽

Lift And Drag

A case study was conducted to investigate and quantify stabiliser fin-hull interaction using a combination of Computational Fluid Dynamics and physical model experiments. The fin-hull interaction was studied by comparing the lift and drag of a stabiliser fin in a free stream condition and when attached to a hull. The findings of this case study showed that using free stream fin characteristics to predict performance of a stabiliser fin fitted to the hull resulted in an over-prediction of drag by up to 46% and under-prediction of lift by up to 75% for the speeds and angle of attack analysed. These discrepancies are for this case study only and in practice will vary for different hull forms, fin types, fin location and angles of attack. However, the research highlights the limitations of using free stream fin characteristics to predict the performance of a fin fitted to a hull.

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