Abdorreza Kabiri-Samani

Abdorreza Kabiri-Samani
Isfahan University of Technology | IUT · Department of Civil Engineering

Professor

About

75
Publications
13,860
Reads
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739
Citations
Additional affiliations
September 2020 - present
Isfahan University of Technology
Position
  • Professor
June 2011 - September 2020
Isfahan University of Technology
Position
  • Professor (Associate)
June 2007 - May 2011
Isfahan University of Technology
Position
  • Professor (Assistant)

Publications

Publications (75)
Article
Submerged flexible mounds are designed to reduce the incident waves’ energy based on their motion, allowing for greater movements by attaching at one side to the bottom. In the present approach, an approximate analytical solution is proposed based on the Fourier transform and Hamilton’s principle to investigate the structural displacements of a sub...
Article
Shaft spillways are commonly provided with adequate submergence to avoid air entrainment and swirling flows. However, other structural approaches can also be considered for this purpose if the required approach flow conditions cannot be met. Optimising the inlet shape, for example by installing a circular piano-key (CPK) inlet over the shaft spillw...
Article
This study investigates hydraulic characteristics of flow at marguerite-shaped inlets with holes at the bottom of their lobes, known as modern marguerite-shaped inlets, based on model experimentation. This innovation reduces the swirling flow strength and improves the hydraulic performance of simple shaft spillways. Head–discharge relationships, fl...
Article
Weirs are one of the most common hydraulic structures used to regulate the upstream approach flow depth and measure the flow discharge. The hydrofoil weirs are a type of short-crested weirs that are designed based on the airfoil theory. These weirs have some merits compared to other types, such as a higher discharge coefficient, more stability, bet...
Article
In this paper, the dynamic behaviour and seismic damages of concrete cylindrical water storage tanks are investigated. Furthermore, by modeling the reservoirs, using normal concrete and engineered cementitious composite (ECC), the effects of ECC on reducing the seismic damages of reservoirs are investigated. For this purpose, ANSYS software is used...
Article
Abstract: An analytical model for evaluation of boundary shear stress in compound open-channel bends is developed. Perpendicular volumetric elements are generated in all cross sections of a bend. Each element represents an equation with two parameters, including the secondary current parameter and momentum transfer coefficient, accounting for accel...
Article
Hydraulic characteristics of swirling flow at shaft spillways with an innovative inlet, namely the marguerite-shaped inlet, is investigated based on model experimentation. Detailed measurements of head–discharge relationship, flow regimes, water free-surface profiles, flow circulation, discharge coefficient and threshold and critical submergence de...
Article
Prediction of air-water two-phase flow frictional pressure loss in pressurized tunnels and pipelines is essentially in the design of proper hydraulic structures and pump systems. In the present study artificial neural networks (ANN) and adaptive neuro-fuzzy inference system (ANFIS) are employed to predict pressure loss in air-water two-phase slug f...
Article
This study investigated flow characteristics around a cylindrical pier under a partially submerged bridge deck. The tests were carried out in clear water conditions for both free-surface and pressure-flow conditions. Three-dimensional velocity measurements were taken at different positions along the centreline of the flume using an acoustic Doppler...
Article
A submerged flexible mound breakwater can be employed for wave control in shallow water as an advanced alternative to the conventional rigid submerged designs. This study presents a flexible breakwater with an innovative geometry based on model experimentation. Experimental studies were performed to compare the wave energy dissipation by the flexib...
Article
A hydrofoil weir is a special type of weir that is designed on the basis of aerofoil theory. These weirs have the merits of a higher discharge coefficient, more stability, and fewer fluctuations for a water-free surface compared to sharp-, broad and long-crested weirs. Hydrofoil weirs with an incidence angle of potential flow look like ogee weirs a...
Article
The streamlined weirs are a special type of weirs, designed on the basis of airfoil theory. Because of their particular design, they have some merits compared to the other types of weirs, such as; high discharge coefficient, more stability of overflow and less fluctuations of water free surface. In the present study, a numerical simulation performe...
Article
Full-text available
Precise estimation of the local scour at bridge piers, considering flow unsteadiness and bed non-uniformity is crucial for economic and safe design of bridge piers. This study investigates scour at bridge piers in uniform and armored beds, under steady and unsteady flow conditions, applying feed-forward back-propagation (FFBP) artificial neural net...
Article
Annular reinforced concrete ribs, or baffles, have been used effectively for suppressing liquid sloshing due to earthquake motion in large cylindrical tanks. Meanwhile, these added structural elements may change the structural characteristics of tanks and negatively affect their seismic behavior. In this paper, effects of baffles on the seismic beh...
Conference Paper
Flow in curved compound channels is completely three-dimensional. The centrifugal force intensifies the secondary currents and the interfaces between the main channel and the floodplains generate some new secondary current cells which grow from the bed towards the surface. In order to take into consideration all aspects of flow in these kinds of ch...
Article
Full-text available
Simultaneous effects of centrifugal force, floodplain interferences, and variation of the depth-averaged velocity are combined in an analytical model to derive a relationship for estimating the secondary current parameter in bends of compound open channels. This parameter is evaluated using the experimental data. To generalize the obtained relation...
Article
Full-text available
In the present study, fluid, structure and soil interactions in a pressurized water tunnel were modeled by a two-dimensional finite element method, using the “ABAQUS” software. The tunnel lining was considered as a roughening coverage to decrease the roughness coefficient and to increase the flow velocity. The mechanical parameters of surrounding r...
Article
Seismic fragility curves of concrete cylindrical tanks are determined using the finite element method. Vulnerabilities including sloshing of contents, tensile cracking and compression failure of the tank wall due to bending are accounted for. Effects of wall flexibility, fixity at the base, and height-diameter ratio on the response are investigated...
Article
Full-text available
A comprehensive set of experiments was performed on grid drop-type dissipators in a rectangular open channel. The study aims to examine the adjustment and boundaries of different flow regimes as well as the variation of flow hydraulic characteristics downstream of a grid drop-type dissipator, caused by the gradual alteration of the tail-water depth...
Article
Local scour in the transition from super- to sub-critical flow without a hydraulic jump is investigated based on model experimentation. Supercritical flow was enforced by a box-culvert, passed a curved bed, and then flowed over the sediment bed. The scour processes and the initiation of sediment motion are discussed. Attempts are also made to expla...
Article
Full-text available
The present study focuses on out-of-plane and in-plane vibrations of sluice gates due to the fluid–structure interaction based on numerical modelling, using the finite-element method. Primarily, the vibration of the gate was restricted to a single direction, detaching the horizontal and vertical vibrations of the gate so as to exclude their interac...
Article
Side weirs are hydraulic control structures widely used in irrigation and drainage systems as well as wastewater treatment plants. These structures also serve as adjusting/diverting flow structures with a minimum head loss. In the present study, by applying experimental data of more than 400 laboratory tests and using the multivariable nonlinear pa...
Article
Full-text available
A set of experiments is carried out in a towing tank to study the effects of the curvature of perforated plates on the wave reflection coefficient (Cr). The curvature of a perforated plate can be changed by rotating a reference perforated plate aboutits origin according to the parabolic equation y=−x2. A plunger-type wave maker is used to generate...
Article
Swirling flow at vertical shaft spillways with an innovative geometry, circular piano-key (CPK) inlet, is investigated based on model experimentation. Detailed measurements of head–discharge relationships, threshold submergence, and flow hydraulic characteristics were performed for CPK spillways. Conditions at the beginning of the submergence are a...
Article
Side weirs are hydraulic structures that are used in irrigation and drainage channels, flood control systems, and wastewater collection networks to divert the flow, isolate the sedimentation, and reduce the bed loads. Labyrinth side weirs are a type of side weirs with a higher discharge coefficient compared to the traditional side weirs. During the...
Article
In spite of some progress in the study of the transition from super- to subcritical flow without a hydraulic jump, many issues remain unclear, particularly in relation to the turbulence structure and dissipative mechanisms in the transition region. This paper therefore is focused on the experimental investigation of the turbulence characteristics i...
Conference Paper
Full-text available
در تحقيق حاضر جريان عبوري از سازه¬ي تبديل حذف پرش هیدرولیکی با بهره¬گيری از نرم¬افزار OpenFOAM در شرایط هیدرولیکی مختلف شبيه¬سازي شده و سپس تغييرات پارامتر¬هاي آشفتگي و مشخصه¬های هیدرودینامیکی جریان مورد بررسی قرار می¬گيرد. برای مدل سازی عددی از حل سیال دو فازی به روش جزء حجم سيال VOF بهره گرفته شده است. همچنین از مدل آشفتگی RNG k-εاستفاده شده است....
Article
In some cases, the flow head loss is not the main concern of design engineers, who instead prefer to exclude the hydraulic jump from super-to subcritical flow due to unfavourable flow conditions. The present study investigates the flow field and hydrodynamic aspects of the transitional region from super-to subcritical flow without a hydraulic jump....
Conference Paper
Full-text available
Fluid-Structural Interaction (FSI)/Finite Element Analysis(FEA)/ Subroutine
Article
The study of water hammer in air-water, two-phase flows in hydraulic structures such as pressurized pipelines and tunnels, siphons, culverts, and junctions is of great importance for design purposes. Water hammer if combined with a periodic slug flow would lead to severe periodic transient pressure fluctuations inside the conduit. Laboratory experi...
Article
Rubber dams are flexible cylindrical inflatable structures attached to a rigid base and inflated by air and/or water. Due to elasticity of the structure and continuous variation of its shape during operation, a rubber dam structural and hydraulic analysis is more complicated than a rigid dam. This paper deals with numerical analysis of the rubber d...
Article
Circular-crested weirs are overflow structures with a reasonably high discharge coefficient, compared with that of sharp-and broad-crested weirs. In this study, combining the potential flow around a circular cylinder and the free vortex flow, to determine the discharge coefficient and velocity distribution simulated flow over circular-crested weirs...
Article
Experimental and numerical studies were performed to examine the relationship between the hydraulic properties and physical dimensions of a subsurface weir system and the discharge over it under steady-state conditions. Experimental modelling was based on a laboratory-scale physical sand-tank model, within which a subsurface dam and weir structure...
Article
An experimental–analytical investigation was performed to explore whether a hydraulic jump in a transition from super- to subcritical flow regime can be avoided. As the free-surface profile passes the critical depth, the transitional point is a singular point. A transition structure was designed based on the energy principle and the singular point...
Article
Full-text available
Reservoir operation cannot be carried out without due heed to surface water and groundwater resources, since neglecting either will have irreversible consequences. Optimal operation of the Zayandehrood Dam which supplies water into the Zayandehrood River basin in the central plateau of Iran is a case in point which warrants due consideration paid t...
Article
A rectangular labyrinth weir has a very good flood release capacity as well as strong economical and structural advantages. In this study, combined analytical and experimental investigations were undertaken for a rectangular labyrinth weir. The analytical model is based on the synthesis of general weir equations and spatially varied flow dynamic eq...
Article
Free surface vortex and air entrainment are not favorable experiences in hydropower and pumping projects. While complete omission of vortex and air entrainment is not always cost effective, partially weakened free-surface vortex flow is more economical and practical. Hence, in this study, a comprehensive set of experiments were conducted to partial...
Article
Semianalytical equations were derived to evaluate the mean boundary shear stress in smooth trapezoidal open channels using conformal mapping techniques. This process tends to a complicated function that should be simplified based on numerical integration. Also, based on a mathematical analysis, an approach that divides the flow area into subsection...
Article
A comprehensive study was performed to examine the flow characteristics over rectangular sharp-crested side weirs based on the traditional weir equation. To obtain a generally convenient discharge coefficient relationship, series of experiments were conducted according to manipulation of different prevailing parameters. The flow regime was consiste...
Article
The hydraulic design of a side weir is complicated because the flow conditions vary with distance along the weir, resulting in the 3-D nature of flow over side weirs. Accordingly, by considering the criticism on De Marchi's discharge coefficient formula (Part I), the present study examines a method proposed by Domínguez for estimating the discharge...
Article
Full-text available
Intake vortices are the result of angular momentum conservation at the flow constriction, where angular velocity increases with a decrease in the cross sectional area. The common solution for avoiding air-entrainment and swirl is to provide sufficient submergence to the intake. If the required approach flow conditions can not be met to avoid swirl...
Article
Accurate estimation of scour depth is needed for economic and safe determination of bridge pier foundation depth. Most design criteria are based on maximum scour depth due to the steady design discharge without flow time limit. In this paper, the results are presented of an experimental investigation on local scouring around a single bridge pier un...
Article
Full-text available
A comprehensive experimental investigation was performed to better understand the effect of the weir geometry of a Piano Key weir (PKW) on the discharge coefficient for both free and submerged flow conditions. Experiments were conducted in a 12 m long, 0.4 m wide and 0.7 m deep rectangular glass-walled flume. The effects of the PKW geometry, includ...
Article
There are different numerical models performed on hydrodynamic behavior of dam break flood in canals and floodplains based on 1D and 2D modeling approaches. In recognition of increasing demand to precise modeling of dam break flood, and due to the limited instructions to choose the best computational model, this article appraises the difference bet...
Article
Abrupt changes of the channel bed elevation in hydraulic systems, e.g. in chutes, drops and steeped spillways, results to create a sever flow kinematic energy. This excess energy, can tend to different phenomena, such as tremendous forces, scouring and degrading the channel bed, resulting to destruction of the downstream hydraulic structures. The m...
Article
In the present study, methods for improving the hydraulic performance of labyrinth side weirs in a rectangular channel are reported based on model experimentation. For this purpose different arrangements and configurations of groups of guide vane plates and piles in the side weir flow field were tested. Experiments were conducted on labyrinth side...
Article
Full-text available
Predictions of long-shore sediment transport rate (LSTR) are a vital task for coastal engineers in the determination of erosion or accretion along coasts. Many scientists have tried to find empirical method for the estimation of LSTR in the past decades. However, due to the influence of significant number of parameters and randomness of the data, t...
Article
Incomplete self-similarity (ISS) concept is employed to develop the equations from existing experimental results of flow over an oblique rectangular sharp-crested weir for both free and submerged flow. The stage-discharge relationship is obtained by theoretical analysis, based on the application of the dimensional analysis and the ISS theory. For a...
Article
A comprehensive set of experiments was performed on weirs placed obliquely in a rectangular open channel. The main objectives were to investigate the effect of the weir angle relative to the approach flow direction on the behaviour and the hydraulic flow characteristics and to examine methods such as using upstream guide vanes and inclined aprons t...
Article
Experimental study has been carried out under a clear-water scour condition to explore the local scour around semi-elliptical model bridge abutments with armor-layer bed, compared with the local scour process around semi-circular abutment. Two types of model bridge abutments, namely semi-elliptical and semi-circular abutments have been used in this...
Article
Full-text available
The study of air-water, two-phase flows in hydraulic structures such as pressurized flow tunnels, culverts, sewer pipes, junctions, and similar conduits is of great importance for design purposes. Air can be provided by vortices at water intakes, pumping stations, aerators, steep channels, etc. Under certain conditions, air may also be introduced i...
Article
Flow discharge over an oblique weir is greater than that over a straight or plain weir for the same water head due to its extra length with respect to the channel width or fully extended plain weir. In this study, a new theoretical approach is used for the hydraulics of oblique weirs. The main objective is to investigate the eeect of diierent hydra...
Article
Full-text available
One of the sources of disturbance at intakes is the occurrence of free-surface vortices with an air core. The most common solution for avoiding air-entrainment is the use of anti-vortex devices and, especially, plates for large pipe or shaft intakes. If plates are used, then, the geometry and position of them should be studied experimentally. Since...
Article
In this study, the flow characteristics have been investigated by measuring separation zone, surface and velocity profiles over the circular crested side weirs. An equation was proposed for the length of the separation zone using dimensional, statistical and regression analysis. The dimensional analysis showed that the length of separation zone dep...
Article
Thee enclosed basin has certain natural frequencies of seiche, depending on the geometry of the water boundaries and the bathymetry of water depths. Therefore, the variation in the water surface at a point becomes irregular, as caused by the combination of several natural frequencies, which may be considered as the superposition of sinusoidal frequ...
Article
Air in water flow is a frequent phenomenon in hydraulic structures. The main reason for air entrainment is vortices at water intakes, pumping stations, tunnel inlets, and so on. The accumulated air in a conduit, can evolve to a different flow pattern, from stratified to pressurized. Among different patterns, slug is most complex with extreme pressu...
Article
Air-water two-phase flow usually occurs during a sudden rise in water level at a tunnel or during the falling of the water level at an upstream reservoir while entering the conduit. When this happens, different flow patterns are generated, due to the hydraulics of flow and fluid properties. An analytical/numerical model, based on the assumption of...

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