Simulation of local scour caused by submerged horizontal jets with Flow-3D numerical model

Document Type: Research Paper


1 Javid Institute of High Education, Jiroft, Iran

2 Department of Range and Watershed Management, Faculty of Natural Resources, University of Jiroft, Jiroft, Kerman, Iran

3 Consulting Engineer, Saze Ab Halil Co., Jiroft, Iran


One of the most concerning issues for researchers is to predict the shape and dimensions of the scour pit near
hydraulic structures such as the base of bridges, weirs, valves and stilling basins due to both financial and human
hazards induced by destruction of the structure. As the scour issue has its own complexity in relation to the
multiplicity of effecting factors on it, in this study therefore, the results of laboratory analysis of local scour due to
submerged horizontal jets were compared with numerical simulation results from Flow-3D three-dimensional model
to test the potency of the numerical model. As a result, the model is proposed in place of the experimental model
which has its own drawbacks and high costs. In this study, we measure maximum scour depth in relative equilibrium
in 2 states and 6 test modes with different valve openings and tail water depth per different discharges. Comparison
of the results indicates about 11% error for Flow-3D numerical model in relation to the experimental model which by
considering the complexity of scour and deposition phenomena, is considered a good result.


Main Subjects

Abdelaziz, S., M.D. Bui, P. Rutschmann, 2010.
Numerical simulation of scour development due to
submerged horizontal jet. River Flow. Process of the
International Conference on Fluvial Hydraulics, 8–10
September, Braunschweig, Germany.
Ali Hosseini, P., 2008. The study of local scour due to
submerged horizontal Jets using experimental
models. M.Sc. Thesis, University of Tehran, Tehran,
Amir Aslani, Sh., M. Pirestani, A.A. Salehi neishabouri,
2008. Numerical study on the effects of internal
friction angle of sediments on scour hole caused by
free fall Jet. 2th National Conference on Dam and
Hydroelectric Power Plants, 14&15 May, Tehran, Iran
Bakhiet, Sh., G.A. Abdel-Rahim, K.A. Ali, N. Izumi,
2013. Prediction of scour downstream regulators using
ANNs. International Journal of Hydraulic Engineering,
2; 1-13.
Baranya S., J. Jozsa, 2006. Flow analysis in river danube
by field measurement and 3D CFD turbulence
modelling. Journal of Periodica Polytechnica. Civil
Engineering, 50; 57–68.
Chatterjee, S., S. Ghoch, 1980. Submerged horizontal jet
over erodible bed, Journal of the Hydraulics Division
Proceedings of the American Society of Civil
Engineers, 106; 1765-1782.
Day, S., A. Sarkar, 2008. Characteristics of turbulent flow
in submerged jumps on rough beds. Journal of
Engineering Mechanic, 134; 49-59.

Hager, W., H. Hans Erivin Minor, 2005. Plung pool in
prototype and laboratory. Hydraulics of Dam and River
structures, London, 165-172.
Hussein H.H, A.k.J. Inam, I.H. Nashwan, 2012.
Evaluation of the local scour downstream untraditional
bridge piers. Journal of Engineering and Development,
16; 36 – 49.
Hamidifar, H., M.H. Omid, M. Nasrabadi, 2011. Scour
downstream of a rough rigid apron. World Applied
Sciences Journal 14; 1169-1178.
Hopfinger, E.J., A. Kurniawan, W.H. Graf, W.U.
Lemmin, 2004. Sediment erosion by gortler vortices:
The scour-hole problem. Journal of Fluid Mechanics,
520; 327-342.
Karim, O.A., K.H.M. Ali, 2000. Prediction of patterns in
local scour holes caused by turbulent water jets.
Journal of Hydraulic Research, 38; 279-287.
Khanjani, M., M. Abdolahi, 2010. Numerical
investigation of local scour and deposition of
permeable breakwater. 8th International Seminar on
River Engineering, 26-28January. Shahid Chamran
University, Ahwaz, Iran.
Khosronejad, A., S. Kang, F. Sotiropoulos, 2012.
Experimental and computational investigation of local
scour around bridge piers. Journal of Advances in
Water Resources, 37; 73-85.
Kim, Ch., J. Kang, H. Yeo, 2012. Experimental study on
local scour in the downstream area of low drop
structure types. Journal of Engineering, Scientific
Research, 4; 459-466.
Mahboudi, A., J. Attari, M.R. Madjdzadeh tabatabai,
2010. Experimental study scour control of horizontal
submerged jets using riprap. 5th National Congress on
Civil Engineering, 4-6 May, Ferdowsi University of
mashhad, Iran.
Marson, C., E. Caroni, V. Fiorotto, L. Deppo, 2003. Flow
field analysis around a groin. Proc. of 30th IAHR
Congress, Thessaloniki, Greece, Theme C, Hydraulics
of Groynes, 377-384.
Mazurek, K., N. Rajaratnam, D. Sego, 2001. Scour of
soil by submerged circular turbulent impinging jets.
Journal of Hydraulic Engineering, 127; 598-606.
Momeni Vasalian, R., S.H. Mousavi Jahromi, M. Shafaei
Bajestan, 2007. Scour rectangular jet downstream from
the cup-shaped projectile. 7th International Seminar on
River Engineering, 13-15 February, Shahid Chamran
University, Ahwaz, Iran.
Najafzadeh, M., 2009, Experimental study and simulation
of local scour at bridge foundations in cohesive soil.
M.Sc. Thesis, Shahid Bahonar University, Kerman,
Nik Hassan, N., R. Narayanan, 1985. Local scour
downstream of an apron. Journal of Hydraulic
Engineering, 111; 1371-1385.
Pagliara, S., W. Hager, H. Minor, 2006. Hydraulic of
plane pool scour. Journal of Hydraulic Engineering,
132; 450-461.
Salehi Neyshabouri A.A., A.M. Ferreira Da Silva, 2003.
Numerical simulation of scour by a free falling jet.
Journal of Hydraulic Research, 41; 533-539.
Smith,H. D B, 2007. Flow and sediment dynamics around
three-dimensional structures in coastal environments.
PhD thesis, The Ohio State University.
Sui, J., M.A.A. Faruque, R. Balachandar, 2008. Influence
of channel width and tailwater depth on local scour
caused by square jets. Journal of Hydro-environment
Research , 2; 39-45.
Liu, X., M. García, 2008. Three - dimensional numerical
model with free water surface and mesh deformation
for local sediment scour. Journal of Waterway, Port,
Coastal, and Ocean Engineering, ASCE, 134; 203–217.
Xianfan, C., Q. Yanlong, 2010. The numerical simulation
of local scour around offshore pipeline. Proceedings of
the Twentieth International Offshore and Polar
Engineering Conference. Beijing, China, 20 – 25 June,