Hamed Sarkardeh

Hamed Sarkardeh
Hakim Sabzevari University · Department of Civil Engineering

Ph.D. in Civil Engineering and Post-Doc in Mechanical Engineering
Associate Professor

About

72
Publications
22,107
Reads
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705
Citations
Citations since 2017
43 Research Items
603 Citations
2017201820192020202120222023020406080100120
2017201820192020202120222023020406080100120
2017201820192020202120222023020406080100120
2017201820192020202120222023020406080100120
Additional affiliations
September 2014 - present
Hakim Sabzevari University
Position
  • Professor (Assistant)
September 2009 - present
Iran University of Science and Technology
Position
  • Senior Researcher
September 2007 - September 2015
Water Research Institute
Position
  • Senior Researcher

Publications

Publications (72)
Article
In this study, design, construction and laboratory tests of a pyramid solar desalination system with acoustic technology were investigated. The designed solar desalination system includes a pyramidal glass coating, a black galvanized metal pond, ultrasonic modules, sealant for insulation and blower that is manufactured. The environmental parameters...
Article
Full-text available
Permeability coefficient of soil (k) is one of the most important parameters in groundwater studies. This study, two robust explicit data-driven methods, Including classification and regression trees (CART) and the group method of data handling (GMDH) were developed using the characteristics of soil, i.e., clay content (CC), water content (ω), liqu...
Article
This study aimed to investigate the effect of wind load on traditional dome buildings using the computational fluid dynamic (CFD) techniques. In this study, fifteen Iranian commonly used dome architectures with combined arcs are chosen to numerically investigate the variations in wind pressure coefficient (Cp) on these domes at different heights an...
Article
Full-text available
In the present study, using a quasi 3D analytical simulation, air concentration distribution in ski jump generated jet is calculated. A numerical simulation is also performed to verify the results of the analytical model in parallel with the available experimental and other analytical data. By solving continuity and momentum equations in the case o...
Article
Full-text available
In the present paper, free surface vortex formation at intakes is investigated analytically. By assuming a spiral form for vortex streamlines, continuity and momentum equations were integrated and solved in a vortex flow domain. From this solution, velocity and pressure distributions were found above the intake under vortex action. An equation for...
Article
Full-text available
Prediction of dynamic pressure distribution (\( P^{*} \)) is a subject of great importance in the design and operation of the hydraulic structures. Flip buckets, using as hydraulic structures for dissipation of the excess energy outflow, are usually constructed at the end of the chute of the spillways. In this research, based on experimental studie...
Article
Wave interaction in marine structures is an important issue where requires to be considered in view of number of bases, piles and arrangement method. In this research, effect of waves and their forces on piles with different arrangements was investigated using numerical modeling. Simulations were performed in presence of bracing elements between pi...
Article
Full-text available
The outflow from dams, due to its huge amount of kinetic energy, can cause damages such as scouring of the riverbed or destruction of the equipment. Stilling basins are structures that dissipate the excess flow energy at downstream of dams. One of the most common methods, which is used in hydraulic structures analysis, is numerical simulation. Most...
Article
Free-surface vortex formation is one of the undesirable hydraulic phenomena that may occur at intakes during the dewatering reservoir. This research is meant to investigate the effect of waves on formed vortices in vertical intakes numerically by applying STAR-CCM + software. The simulation was conducted to model the free surface and turbulence by...
Article
Full-text available
In hydrodynamics the applications range of incompressible flows is very wide. In this study, a robust, high order modeling approach is introduced, based on the MLPG meshfree method-based radial basis functions (RBF-MLPG) method, for solving the incompressible flow field. In other words a MLPG meshfree method based on an interpolation function is pr...
Article
Full-text available
In the present experimental and numerical research, the flow behavior in a reservoir and horizontal water intake was analyzed in the presence of surface vortices. To do so, velocity field, vortex strength, and Reynolds number in different horizontal sections in the reservoir and the energy loss and entrained air volume at horizontal intake pipe at...
Article
Full-text available
Pressure fluctuations are among the favorite topics for hydraulic engineers due to their critical role in the design and safe operation of hydraulic structures. In this study, three explicit data-driven models, including Classification and Regression Trees (CART), Gene Expression Programming (GEP), and Multivariate Adaptive Regression Splines (MARS...
Article
Pile groups are employed in sea and ocean environments in order to support marine and offshore structures. Estimation of scour depth around pile groups is one of the important factors in the design of coastal and marine structures. The scour phenomenon is a serious hazard that threats the structural stability of piles. Data-driven methods are being...
Article
Scour around piles is considered as one of the most important phenomena which could undermine the stability of piles. Data-driven methods are now being used more and more to predict complex phenomena such as scour around of pile groups. In this study, three data-driven methods including multivariate adaptive regression spline (MARS), classification...
Article
Gypsum is one of the karstic rocks with many positive and negative characteristics. The most important defect of these rocks is solubility against water flow. The dissolution phenomenon in gypsum is accompanied by the release of the sulfate ion in water increasing its concentration, gradually. In this research, the effect of water flow temperature...
Chapter
Ultra-High Performance Cementitious Composites (UHPCC) is a kind of concrete with specific characteristics that has lesser drawbacks in term of tensile strength and breakage. One of the methods for improving the mechanical properties of concrete is adding fibers. This study numerically investigates the effect of steel fiber with different volume fr...
Article
Full-text available
One of the major problems commonly encountered by intakes of the hydroelectric power plants is the formation of the vortex and turbulent flow at the intake span. The use of the image processing method by using the PTV technique in a survey flow hydraulic of a horizontal intake with a trashrack by certain opening, under the submergence depths and di...
Article
One of the major problems commonly encountered by intakes of the hydroelectric power plants is the formation of vortex and turbulent flow at the intake span. The use of the image processing method by using the PTV technique in a survey flow hydraulic of a horizontal intake with a trashrack by certain opening, under the submergence depths and differ...
Article
Full-text available
The Morning Glory spillway is one of the types of spillways that are used for the passage of excess waters and floods from the dams' upstream to the downstream of the dams. Numerical simulations and examination have been rarely done on the sectoral Morning Glory spillways, which are used due to special conditions in the topography of the constructi...
Article
In this study, the passage of waves through pile groups with different arrangements is investigated using a three-dimensional (3D) numerical model. For the simulations, waves of three different heights of 36, 58, and 81 mm, a fixed period of 0.88 s, and a fixed wave length of 1.128 m were used. To simulate the waves and flow pattern through the pil...
Article
In the present research, hydrodynamic behavior of free surface vortices including surface displacement of the vortex core as a function of the vortex stability, relationship between the intake hydraulic parameters and vortex strength and characteristics of the vortex vertical stretching as a function of the intake hydraulic parameters were experime...
Article
In this paper, the compressive strength, tensile strength and growing rate of compressive strength in 3, 7, 28 and 90 day ages for steel, polypropylene and hybrid steel-polypropylene fiber reinforced concrete with different water to binder ratios (0.4 and 0.5) in a real marine condition and tidal zone were determined. Moreover, regarding a large nu...
Article
A new approach on anti-vortex methods as hydraulic-based anti-vortex was investigated experimentally in the present study. In the investigated method, a submerged water jet is used as the anti-vortex mechanism. The added jet acts as a source of external momentum. This leads to change the intake-induced hydrodynamic pattern in the near-field of the...
Article
Intake direction is one of the most important factors which have significant effect on vortex formation at intakes. Due to the importance of withdrawal direction to vortex formation, the present study examined the effect of different intake angles on strength of vortices and critical submergence. Experiments were performed on dual and single intake...
Article
Full-text available
In the present study, the effect of inlet flow condition of a stilling basin on the hydrodynamic parameters of flow as well as velocity and pressure distributions, vorticities, pressure fluctuations, turbulence intensities, and hydrodynamic loads were investigated. To do so, two practical and usual cases of flow at the downstream of a bottom outlet...
Article
In the present paper, the effect of guide wall and pier geometry on the flow pattern of a dam spillway was studied. Different scenarios were numerically simulated to optimize the geometry of the guide walls and piers of the spillway in different hydraulic conditions. The RNG and VOF models were used for turbulence and free surface simulations, resp...
Article
In this study, the effect of an end sill angle on the hydrodynamic parameters of a stilling basin, such as pressure, velocity, turbulence intensity, vorticity and energy dissipation, is investigated numerically. Simulations are performed using RNG and VOF for turbulence and free surface models, respectively. After verifying the numerical results wi...
Article
In the present research, effect of silica fume as an additive and oil polluted sands as aggregates on compressive strength of concrete were investigated experimentally. The amount of oil in the designed mixtures was assumed to be constant and equal to 2% of the sand weight. Silica fume accounting for 10%, 15% and 20% of the weight is added to the d...
Article
In the present research, dissipating free surface vortices over the intakes by designing a hydraulic anti-vortex method is studied experimentally. In this method, an up-stream submerged water jet is used as a hydraulic-based anti-vortex mechanism. The imposed jet acts as a point source of external momentum to the formed free surface area. The added...
Article
One of the important subjects in massive concrete structures is the control of the generated heat of hydration and consequently the potential of cracking due to the thermal stress expansion. In the present study, using the waste turnery steel fibers in the massive concretes, the amount of used cement was reduced without changing the compressive str...
Article
Full-text available
The main kind of deterioration in marine Reinforced Concrete (RC) structures and other infrastructures is steel bar corrosion due to cracks in concrete surfaces, which leads to the reduction of the load carrying capacity, ductility, and structural safety. It seems that steel fibers can reduce and delay the cracking, and increase the flexural streng...
Article
Surface vortices are the main reason of flow instability and entraining air and debris into the intakes. Using structural based anti-vortex facilities is a common method for dissipating vortices over the intakes. In the present experimental study, performance of a new hydraulic based anti-vortex method is compared with available structural based an...
Article
In order to study the features of vortex at horizontal intakes, numerical investigations have been performed. The tangential, radial, and axial distributions, and water surface profile were simulated to evaluate the flow behaviour and existence of an air-core vortex. The numerical results agree with existing experimental data. The correlation of vo...
Article
Vortex formation over the intakes is an undesirable phenomenon within the water withdrawal process from a dam reservoir. Calculating the minimum operating water level in power intakes by empirical equations is not a safe way and sometimes contains some errors. Therefore, current method to calculate the critical submergence of a power intake is cons...
Article
In the present study, a numerical investigation was performed to estimate air entrainment rates due to intake vortices in different hydraulic conditions. The numerical model was verified with the experimental data. The agreement between numerical and experimental results for air entrainment rates and circulation was good. Regarding formed funnel sh...
Article
In the present study, a quasi 3D analytical model of drop and deflector jet is developed for calculating air concentration distribution in the flow. Continuity and momentum equations were solved in the whole flow domain of this model, in which air content in the flow is also considered. A numerical simulation is also performed to verify the results...
Article
Full-text available
Oil pollution into the concrete composed materials, leads to decrease the compressive strength of the constructed structure. In the present study, effect of using a natural pozzolan named Zeolite on concrete structures was tested in different marine conditions. A fixed amount of oil equal to 2% of sand weight was added as the pollution into the con...
Article
Accuracy of estimated evaporation in the arid and semi-arid areas for hydrologic works is a challenging problem and needs to be calibrated for certain areas. The current study has focused on estimating the accuracy and calibrating of evaporation, evapo-transpiration and pan coefficient equations. In this research, pan evaporation data of Sabzevar s...
Article
Full-text available
Morning glory spillway is one of the types of spillways using to pass excess water from the dam upstream to the downstream. This spillway has advantages, but the probability of occurrence of structural vibration and cavitation phenomenon can be mentioned as weak points. This research is done based on the simulation of flow through the morning glory...
Article
In the recent years, compound channels received more attention in hydraulic engineering for their role in estimating and calculating the hydraulic parameters of natural rivers. Usually, for determination of the hydraulic parameters of compound channels, physical models are used which have cost and time assumption. According to the wide usage of num...
Article
The formation of vortices above the submerged discharge intakes of water reservoirs is undesirable as they can suck surface debris and air into the discharge pipework. In the present work, a numerical investigation was performed on the performance of an anti-vortex device at the water intake. The numerical simulation of the flow field around a free...
Article
Air–water flow is a complex and challenging subject in many engineering fields as well as hydraulic engineering; and discovery of its characteristics can help the engineers to predict and analyze a probable phenomenon. In the present paper, development of a device capable of measuring the flow velocity, air concentration, diameter and counts of bub...
Article
Vortex formation and subsequent sediment transport into the intake due to sea water withdrawal is one of the problems in coastal engineering. The effect of vortex formation on rate of sediment transport at coastal dual pipe intakes was investigated using a scaled physical model. Experiments were performed on dual pipe intakes at three common intake...
Article
Excessive rainfall can cause runoff flows over the soil surface and as a consequence some amount of water will infiltrate into the soil. From a hydrologic modeling perspective it is necessary to estimate infiltration rate in order to calculate the actual runoff discharge. There are many parameters that can affect the infiltration rate such as soil...
Article
Stilling basins dissipate energy to form hydraulic jumps and rotational flows. Hydraulic jump and rotational current phenomenon produce pressure fluctuation at the bottom of stilling basins. In the present study, pressure fluctuations and their locations have been studied in a physical model of Namrod Dam. Results showed that fluctuations in presen...
Article
In the present experimental research, effect of different heights of obstacle on turbidity current, to control the sedimentation in a reservoir, was investigated. Experiments were carried out with horizontal and steep bed slopes and different flow conditions. To see the effect of obstacle on concentration of overflow turbidity current, some experim...
Article
To dissipate energy and invert excessive discharge flow away from high dams into plunge pool, flip buckets are commonly designed and optimized by hydraulic model studies. In the present study, performance of chute flip buckets in different hydraulic and geometry conditions was investigated using experimental data of five different physical models....
Article
Full-text available
In the present work, a numerical study was performed to analyze the flow behavior in a reservoir in the presence of strong vortices. A challenging subject in this study was the flow field in the reservoir and the mechanism of vortex formation. The numerical model was verified with the available theories and experimental data. Experiments were condu...
Conference Paper
In the present analytical study a two dimensional analytical model was developed for calculating air concentration in air-water flows. To do so, the related partial differential equations in the whole flow domain were solved. The solution was then applied in a free surface flow with air content. The results of analytical model was verified and comp...
Article
Full-text available
The present study focuses on the effect of vortex formation on plane velocities in a reservoir. Velocity measurements are performed in the hydraulic model of Karun III dam and hydropower plant. Different vortices were produced at the horizontal intake by changing the submerged depth. Tangential velocities were measured on a rectangular mesh in the...
Article
Full-text available
The velocity field in a reservoir in the presence of surface vortices was experimentally studied. Experiments were performed with a horizontal intake and with a constant submerged depth and two different intake Froude numbers. The spline smoothing method was used to improve the graphical presentation of the measured data. Results are presented and...
Article
Free surface vortex formation phenomenon at intakes is one of the most important problems in the water withdrawal process. In the present study, the free surface vortex formation was experimentally investigated. Experiments were performed on a single intake with three common intake withdrawal directions (vertical, horizontal and with angle of 45°)....
Chapter
Full-text available
Population increase, loss of energy resources and consequently high energy demand in recent years has caused countries to change their energy consumption policies. One of the most important energy consumers in rural and urban areas are buildings. Therefore, the role of heating and cooling systems is considerable in buildings with high level of ener...
Article
Earthfill dams are constructed with soil based materials and therefore their seismic behaviors are very complex. In the present study two different earthfill dams were simulated and their behaviors were analyzed under a recorded earthquake. Simulations were concerned on the influence of soil tensions and water pressures on the seismic response of e...
Article
Full-text available
Fluent software has been used to simulate flow over a circular spillway and results were compared with experimental data. As the flow over a circular spillway is turbulent and has a free surface, its characteristics are complex and often difficult to be predicted. This study assesses the performance of some turbulence models to predict the hydrauli...
Article
Full-text available
In this recent study we have simulated free surface flow over submerged weirs using the computational fluid dynamics code, Fluent, to forecast flow near the structure where three-dimensional (3D) flows were dominant. The fully 3D, Reynolds-averaged Navier-Stokes equations were solved using the model. To understand the complex flows, the volume of f...
Conference Paper
Full-text available
In order to support the future economic developments in the world, one of the most important objectives is the reduction of energy losses. Apart from this objective, hydropower dams which are considered a renewable energy source encounter this problem. Karun III Dam and Hydropower Plant is constructed on the Karun River in the province of Khuzestan...
Article
The efficiency of horizontal perforated and solid plates, installed on top of an intake for prevention of surface vortex formation, was experimentally investigated. The experiments were conducted on a horizontal intake of a reservoir. By changing the angle of the approach flow, submergence of the intake and the discharge, 36 air-core surface vortic...
Article
Full-text available
In the present numerical study, by using the Fluent software, the ability of it to predict the complex flow conditions is presented. In this purpose, experimental data over a flip bucket in different hydraulic conditions were selected. To simulate the turbulence phenomenon, k-ε Standard turbulence model was selected. Moreover to predict jet surface...
Article
Full-text available
This paper describes the study of two physical models that were built to investigate the energy dissipation and flow regimes for different discharges over stepped spillways with different numbers of steps. These physical models had a general slope of 19?2% and had 12 and 23 steps respectively. Experiments were carried out for a wide range of discha...
Article
The effect of the intake head wall slope and the installation of a trash rack on the type and strength of vortices are studied experimentally. The strength within each vortex was determined by measuring its tangential velocity utilizing an Acoustic Doppler Velocimeter (ADV). Experiments were carried out with a projected intake and an intake with va...
Conference Paper
Full-text available
In hydropower plants the kinetic energy of falling water is captured to generate electricity. In this process, the formation of vortices with an air core at the power intake entrances is expected at lower reservoir levels. The entrainment of air and swirl into the power tunnels leads to a reduction of power generation and vibration and damage to th...
Chapter
In the present work design of a multi level intake is explained for a 65m high rock fill dam. This multi-level intake structure was designed for irrigation purposes with a design discharge of 20 m3/s. This structure, standing vertically in the reservoir, was 65m high and had a rectangular cross section which its dimensions were different at differe...
Article
Full-text available
During the recent years, the hydraulic performance of measurement devices has been considered as an effective factor on flow behavior investigation in irrigation networks. To reach this purpose, making more accurate measuring structures and methods is important respectively. Management to optimize water distribution and consumption in the networks...
Article
Full-text available
Vortex formation due to power generation at hydropower dams could cause serious problems, and eliminating or reduction in its strength is one of the dam designer and manager duties. Therefore, the design and use of anti-vortex structures is usual. Design of an anti-vortex structure for each project is unique and it is therefore necessary to have kn...

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