Abdulnaser Abdulrazzaq Ahmed -

Assist. Prof Dr.

Abdulnaser Abdulrazzaq Ahmed

Research Interests

Gender	MALE
Place of Work	Polytechnic College Mosul
Position	Dean of Mosul Technical Institute
Qualification	Ph.d
Speciality	Civil Engineering
Email	nasir.razaq@ntu.edu.iq
Phone	07708899350
Address	ALTHABAT, NINAWA, Mosul, Iraq

Academic Links

Download CV

Assistant Professor Dr.Abdulnaser Abdulrazzaq Ahmed

Skills

Simulation of flow around hydraulic structure (100%)

Engineering software ANSYS (100%)

Renewable energy (100%)

Turbulence models (100%)

working experience

Academic Qualification

B.SC.

Sep 10, 1991 - Jun 1, 1996

Irrigation and Drainage Engineering department

M.Sc

Sep 15, 2001 - Aug 22, 0004

Water Resources Engineering

P.HD.

Sep 15, 2012 - Jul 10, 2017

Civil Engineering/ Water resources

Working Experience

SURVY [Head of Surveying Technology Department]

Sep 23, 2020 - Feb 22, 2022

Assistant Dean [Assistant Dean for Administrative and Financial Affairs]

Feb 22, 2022 - Aug 26, 2024

Environmental Technologies and Water Resources [Head of Environmental Technologies and Water Resources Department]

Aug 26, 2024 - Nov 6, 2024

Dean [Dean of Mosul Technical Institute]

Nov 6, 2024 - Present

Publications

Comparing the 3D Flow Behavior Around Different Bridge Pier Shapes Using CFD Fluent: Implications for Reducing Local Scour

May 30, 2024

Journal Mathematical Modelling of Engineering Problems

publisher http://creativecommons.org/licenses/by/4.0/

DOI https://doi.org/10.18280/mmep.110522

Issue 5

Volume 11

The current study deals with simulation of 3D- flow around three different types of bridge pier shapes on a flatbed surface. The main objective of this article is to explore how water flows around various types of bridge piers. In this article, the CFD-Fluent (k-epsilon) turbulence model was used to simulate the flow turbulence around untraditional piers named upstream facing aero-foiled shaped pier (US- FASP) and downstream facing aero foiled shaped pier (DS-FASP) and were compared with the circular pier, Results from the experiments were compared to the expected flow velocity (m/s), turbulent kinetic energy (TKE), and other variables. The results of the three-dimensional simulation of the water flow behavior and turbulent kinetic energy around the three various designs of bridge piers support that. The findings suggest that (DS-FASP) is the most effective sort of form to employ since it allows water to flow around it extremely smoothly, resulting in minimal obstruction of the water flow in addition to the lowest TKE. In this investigation, root mean errors were used. mean squared errors (MSE), mean absolute errors (MAE), and both the correlation coefficient (R) and the root mean square error (RMSE). The findings also demonstrated that the type of form (DS-FASP) outperformed pavements with other diverse shapes in terms of performance. From this, it was found that the turbulent kinetic energy (TKE) and longitudinal velocity (u) had mean least square errors (MSE) of 1.5E-0 and 7.6E-08, respectively, and coefficients (R2) of 0.92 and 0.98. .The shape of a wake vortex in a wake region is captured by the (k-epsilon) model. The k- epsilon turbulence model showed good similarities with the experimental results. The study's findings suggest that local cleaning in the vicinity of bridge piers can be scaled back in the future.

Prediction of the discharge coefficient of steeply crested inclined weirs using different neural network techniques

Dec 29, 2023

Journal NTU Journal of Engineering and Technology

publisher http://creativecommons.org/licenses/by/4.0/

DOI https://doi.org/10.56286/ntujet.v2i4.778

Issue 4

Volume 2

The main objective of this work is to accurately predict in irrigation and hydraulic systems the discharge coefficient of the used sharp-crested inclined dams. Training algorithms on radial basis function RBF and multilayer perceptron MLP, and input variables such as weir height, length, inclination, and flow rates. From a tilted weir, researchers have used these training techniques as a model for various neural networks. In addition, the performance of CFNN is better than other neural networks such as RBF and MLP. The discharge coefficient Cd was the output variable. 95 test results were analysed. CFNN achieved a significant reduction in mean square errors (MSE), with values of 9.4363×10-12 and 1.6336×10-05, respectively, in the training and testing phases.

Simulation of flow over stepped and traditional spillways

Apr 2, 2023

Journal Periodicals of Engineering and Natural Sciences

DOI 10.21533/pen.v11.i2.121

Issue 2

Volume 11

There are several challenges that are faced by these structures, such as cavitation and high speed of flow during the dissipation of flow energy. The spillway is one of the key basic elements of dams that are utilized to pass huge volumes of discharge. The current work used computational fluid dynamics (CFD) to numerically estimate the water surface flow and pressure distribution over stepped and traditional spillways. The numerical findings were compared with experimental data using the Renormalization group k- model. The numerical and experimental data have been compared, and it has been determined that there is an acceptable agreement between the two sets of findings.

Read Publication

Comparison of Bridge Piers Shapes According to Local Scour Countermeasures

Jan 5, 2019

Journal The Eurasia Proceedings of Science, Technology, Engineering & Mathematics

publisher ISRES Publishing: www.isres.org

Issue 171-180

Volume 6

Comparison of experimental study was carried out between bridge piers to find out the efficient bridge pier to countermeasures the local scour. In addition the present study is to provide a new method to reduce scour depth in front of bridge pier .The idea of this method is dependent on change the position of two piers (normal pier (10-4) cm and straight aero foil shaped pier) with respect to flow direction (named after here as opposite bridge pier and opposite aero foil pier). The down flow deflected away from the front the opposite piers and the horseshoe vortex becomes small and does not affect the piers.In the present study five piers (normal pier (10-4), opposite pier (4-10), straight aero foil, opposite aero foil and circular) were tested under live-bed condition with flow intensity 58 l/sec. for duration 3 hrs. The velocity field measurements were obtained using an Acoustic Doppler Velocimeter. The results showed that the opposite piers reduce the local scour around the piers. For opposite pier the reduction of scour depth was about 40% compared with normal pier and 54% compared with circular pier. The reduction of the scour hole volume was about 83% compared with circular pier and 23.6% when normal pier compared with circular. For opposite aero foil the maximum depth of scour reduced 58% compared with straight aero foil and 69% compared with circular pier. The reduction of the scour hole volume was about 89% compared with circular pier and straight aero foil reduced scour hole volume about 27% when compared with circular pier.It is clearly from the comparison that the opposite piers are effective countermeasures for reducing local scour depth and scour hole volume, especially opposite aero foil pier. We hope that the results of the present study will be benefitted by the designers and engineers.

Hydrological Modeling of Semi-Arid Region in Ungauged Watershed using AGWA Model

Jul 5, 2018

Journal International Journal of Applied Engineering Research

publisher http://www.ripublication.com/

Issue 6

Volume 13

hydrological behavior and information from hydro meteorological and geospatial data. The majority of these models have been developed to simulate the water discharge resulting from various meteorological conditions according to precipitation or single storm event. Automated Geospatial Watershed Assessment Tool (AGWA) a Geographic Information System (GIS) based watershed modeling tool is designed to simulate ungauged watersheds in arid & semiarid regions uses widely available standardized spatial datasets that can be obtained by design required data base. In this study AGWA model has been applied in Khassa watershed which is located in north east of Iraq to obtain the general hydrological characteristics according to AGWA outputs that shows the response of Khassa watershed to the climate impacts in collaboration with topographic, soil type, land cover and other parameters to the amount of water income to achieve the watershed efficient management through sustainable development and planning for water resources.

Influence of Inclined Bed Channel on Characteristic of Flow for Step Broad–Crested Weirs

May 28, 2018

Journal The Eurasia Proceedings of Science, Engineering & Mathematics

publisher ISRES Publishing: www.isres.org

Issue 118-127

Volume 2

Influence of inclined bed channel on characteristic of flow for step broad–crested weirs was investigated experimentally. Discharge coefficient, water surface profile and Froude number were calculated experimentally.The results showed that water surface profiles were smooth and continues having a descending trend from the point of measurement taking the shape of the weir with a steep drop near the downstream face of the weir. Increasing effective head to crest height ratio (He/Y) and channel bed slope (So), increased the coefficient of discharge (CD) up to 5%. Also it was found. that for small values of (Fr2), the weir performance tends to the ideal .and with increase (Fr2), the discharge coefficient (CD) decrease for all weir models, because the discharge and the velocity heads increases. Empirical equation was developed on the basis of obtained results.

Conferences