Papers by ABUBAKER S A M I DHEYAB
al-Maǧallaẗ al-ʻirāqiyyaẗ li-l-handasaẗ al-madaniyyaẗ/Al-Maǧallaẗ al-ʻirāqiyyaẗ li-l-handasat al-madaniyyaẗ, Jun 1, 2024
SELCUK 10th INTERNATIONAL CONFERENCE ON APPLIED SCIENCES JUNE 21 - 23, 2024- KONYA, 2024
Local scour around single cylindrical piers in non-cohesive beds (non-uniform sand) was investiga... more Local scour around single cylindrical piers in non-cohesive beds (non-uniform sand) was investigated through a series of nine laboratory flume experiments. This study focused on examining the impact of flow velocity, pier diameter, and flow depth on the depth of local scour. Experiments were conducted under a hydraulic discharge of 0.032 m³/sec, utilizing three different flow depths (5.7 cm, 7.55 cm, and 9.1 cm) and three pier diameters (3 cm, 5 cm, and 7.5 cm). The results indicated that all main factors significantly affect the depth of local scour, with the densimetric Froude number (Fr0) having a pronounced influence. The statistical analysis revealed a highly significant positive correlation between Fr0 and the normalized local scour depth (ds/D), with a correlation coefficient of 0.95. Additionally, the study found inverse relationships between ds/D and both the shallowness ratio (h/D) and the coarseness of sediments (d50/D), with correlation coefficients of-0.54 and-0.117, respectively. An increase in pier Reynolds number (Rep) also showed a significant positive correlation with local scour depth, having a correlation coefficient of 0.538. The findings underscore the complex interplay of these factors in influencing local scour, providing valuable insights for understanding and predicting scour around piers in non-cohesive beds.
4th International Congress of Engineering and Natural Sciences (ICENSS 2024),May 24-25 , 2024
Local scour is a significant factor contributing to the bridge's collapse, which is defined by th... more Local scour is a significant factor contributing to the bridge's collapse, which is defined by the erosive action of sediment-water flow in river systems. Thus, studying scouring is a crucial approach to assess the potential for bridge failure caused by scour. This study investigates the local scour phenomenon in non-cohesive bed conditions using both experimental in a laboratory flume and numerical approaches by applying the computational fluid dynamics (CFD) method with FLOW 3D software to model and compute local scour in the same type of bed. Experimental modeling in live bed flow conditions reveals that water depth is the primary factor influencing local scour depth, with high-velocity water exceeding critical velocity resulting in increased scour depth aligned with pier depth. Sediment accumulation occurs downstream from the scour hole, with scour development reaching equilibrium quickly. The developed numerical model, FLOW 3D, proves efficient in simulating scour depth and flow around bridge piers, with mesh quality significantly impacting modeling accuracy.
Iraqi Journal of Civil Engineering, 2025
Local scour is a primary cause of bridge collapse, presenting a complex challenge due to the nume... more Local scour is a primary cause of bridge collapse, presenting a complex challenge due to the numerous factors influencing its occurrence. The complexity of local scour increases with clay-sand beds, particularly in predicting scour depth, as empirical equations are inadequate for such calculations. This study aims to predict local scour around cylindrical bridge piers in clay-sand beds using an artificial neural network (ANN) model. The ANN model was developed using 264 observations from various laboratory experiments. Eight variables were included in the ANN model: clay fraction, pier diameter, flow depth, flow velocity, critical sediment velocity, sediment particle size, bed shear strength, and pier Reynolds number. Sensitivity and statistical analyses were conducted to evaluate the impact of each variable and the accuracy of the ANN model in predicting local scour depth in clay-sand beds. The findings indicate that the ANN model predicted local scour with high accuracy, achieving a mean absolute percentage error (MAPE) of 14.6%. All dimensional variables significantly influenced the prediction of local scour depth, particularly clay fraction and bed shear strength, which were identified as the most crucial parameters. Finally, the MAPE values for local scour depth calculated using empirical equations were significantly higher than those for the ANN model, leading to an overestimation of local scour depth by the empirical equations.
COMPUTATIONAL RESEARCH PROGRESS IN APPLIED SCIENCE & ENGINEERING
The most crucial issue that causes bridge failure is local scour, especially during flood events.... more The most crucial issue that causes bridge failure is local scour, especially during flood events. Therefore, modeling scouring is an essential method to examine the possibility of bridge failure due to scour. Various numerical and laboratory models were conducted to investigate the scour depth around hydraulic structures. This paper investigates the performance of the CFD model to simulate the local scour depth around the bridge pier using Flow-3D. First, the model was built and then calibrated based on experimental outcomes. Further, the results show that the CFD model can provide a good agreement between the numerical and experimental models. The CFD model successfully imitates the scour depth, flow, and velocity around the bridge pier.
CRPASE: TRANSACTIONS OF CIVIL AND ENVIRONMENTAL ENGINEERING, 2022
The most crucial issue that causes bridge failure is local scour, especially during flood events.... more The most crucial issue that causes bridge failure is local scour, especially during flood events. Therefore, modeling scouring is an essential method to examine the possibility of bridge failure due to scour. Various numerical and laboratory models were conducted to investigate the scour depth around hydraulic structures. This paper investigates the performance of the CFD model to simulate the local scour depth around the bridge pier using Flow-3D. First, the model was built and then calibrated based on experimental outcomes. Further, the results show that the CFD model can provide a good agreement between the numerical and experimental models. The CFD model successfully imitates the scour depth, flow, and velocity around the bridge pier.
The finite element (FE) method is used to conduct an analysis of liquid storage tanks This resear... more The finite element (FE) method is used to conduct an analysis of liquid storage tanks This research has focused on the behaviors, under static condition, free vibration and buckling of steel liquid tanks which are designed according to API 650 standards. The mechanical characteristics of the materials and the real geometrical and load measures have been considered in the numerical model. These storage tanks are connecting with American standard steel shape profiles. The equivalent stress (Von-Mises) distribution, deformation in the circular wall of the liquid tank, buckling load and fundamental frequency are computed using finite element method in order to investigate the effect of type of the stiffener, number of course and location of stiffener on the structural behavior of liquid tanks. The uses of the stiffener decrease the stress of wall tank and improve the other structural behaviors
The finite element (FE) method is used to conduct an analysis of liquid storage tanks This resear... more The finite element (FE) method is used to conduct an analysis of liquid storage tanks This research has focused on the behaviors, under static condition, free vibration and buckling of steel liquid tanks which are designed according to API 650 standards. The mechanical characteristics of the materials and the real geometrical and load measures have been considered in the numerical model. These storage tanks are connecting with American standard steel shape profiles. The equivalent stress (Von-Mises) distribution, deformation in the circular wall of the liquid tank, buckling load and fundamental frequency are computed using finite element method in order to investigate the effect of type of the stiffener, number of course and location of stiffener on the structural behavior of liquid tanks. The uses of the stiffener decrease the stress of the wall tank and improve the other structural behaviors.
This paper presents the numerical study of behavior of the sandwich panels, which consists of gla... more This paper presents the numerical study of behavior of the sandwich panels, which consists of glass fiber reinforced polymer skins, and a polyurethane foam core and the sandwich panels, which contains glass fiber reinforced polymer U profile by using the ANSYS APDL program. The behavior of these panels was examined under 4 point load tests and the extent to which the numerical results were compared with the experimental results. Also, we studied the thickness of the skins of the sandwich panel as well as the effect of changing the type of core by using honeycomb core and study the effect of skins type and thickness by using carbon fiber reinforced plastic and aluminum in parametric study. Finite element analysis have given accurate results of the behavior of the sandwich panels under the loads.
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Papers by ABUBAKER S A M I DHEYAB