3D Simulation of Flow around Different Types of Groyne Using ANSYS Fluent

The objective of this project is to study flow pattern around a single spur-dike or groyne with free surface flow using a numerical model prepared in a software known as ANSYS FLUENT 16.0. Model is prepared to   investigate the 3D turbulent flow field around a single straight (SD), two repelling type groyne 45 o and 60 o (RG-45 and RG60) and two different T-shape groynes: TF (groyne with full wing length) and TH (groyne with half wing length) under smooth flat-bed condition. The study shows intense effects on turbulent and mean flow characteristics of different shapes of the groyne, especially for the near-bed region. Amplification of near-bed velocity is due to contraction of the channel cross-section and as well as due to local effects of the groyne structure is higher in the case of SD and repelling groyne (RG-45 and RG-60) than that of T-shape groynes. Horseshoe vortex variation at the base of spur is more compact & strong rotational momentum in the case of RG-45 then others. Observed decreasing order of this compactness & rotational momentum is RG-45; RG-60; SD-90; TH & at last TF. Increased wing length in the case of full wing length T-shape groyne (TF) effects the flow structure at the upstream mini embayment. Dominantly horizontal circulation flow occurs in place of vertical, due to which horseshoe vortex disappears. So we can say that increased wing segment act as a scour countermeasure.

[1]  Mukesh Raj Kafle,et al.  Numerical Simulation of Flow around a Spur Dike with Free Surface Flow in Fixed Flat Bed , 2014 .

[2]  H. D. Vriend,et al.  Flow Details near River Groynes: Experimental Investigation , 2011 .

[3]  J. Duan.  Mean Flow and Turbulence around a Laboratory Spur Dike , 2009 .

[4]  George Constantinescu,et al.  An investigation of the dynamics of coherent structures in a turbulent channel flow with a vertical sidewall obstruction , 2009 .

[5]  G. Constantinescu,et al.  Numerical Investigation of Flow Hydrodynamics in a Channel with a Series of Groynes , 2008 .

[6]  Xiang Y. Ding,et al.  Large Eddy Simulations of Three-Dimensional Flows Around a Spur Dike , 2006 .

[7]  Fotis Sotiropoulos,et al.  Coherent structure dynamics upstream of a long rectangular block at the side of a large aspect ratio channel , 2005 .

[8]  W. Uijttewaal.  Effects of Groyne Layout on the Flow in Groyne Fields: Laboratory Experiments , 2005 .

[9]  Marian Muste,et al.  Scale Effects in Flume Experiments on Flow around a Spur Dike in Flatbed Channel , 2004 .

[10]  Denis Dartus,et al.  THREE-DIMENSIONAL COMPUTATION OF FLOW AROUND GROYNE , 1997 .

[11]  T F Kwan,et al.  A STUDY OF ABUTMENT SCOUR , 1988 .

[12]  S H Wearne,et al.  TECHNICAL NOTE. OBSERVATIONS OF FLOW PATTERNS AROUND SOME SIMPLIFIED GROYNE STRUCTURES IN CHANNELS. , 1968 .

[13]  Anton Schleiss,et al.  Wall-Roughness Effects on Flow and Scouring in Curved Channels with Gravel Beds , 2016 .

[14]  Hong Koo Yeo,et al.  An experimental study on tip velocity and downstream recirculation zone of single groynes of permeability change , 2005 .

[15]  S. Maeno,et al.  INFLUENCE OF THE SPUR DIKE PERMEABILITY ON FLOW AND SCOURING DURING A SURGE PASS , 2003 .

[16]  Nallamuthu Rajaratnam,et al.  Flow Near Groin‐Like Structures , 1983 .