Author
B. Mutiu Sumer
Bio: B. Mutiu Sumer is an academic researcher. The author has an hindex of 1, co-authored 1 publications receiving 149 citations.
Papers
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TL;DR: The effect of leewake of the pipe is the key element in the scour process, and it is demoed in this article, where the results of an experimental investigation on scour below pipelines exposed to waves.
Abstract: This paper presents the results of an experimental investigation on scour below pipelines exposed to waves. The effect of leewake of the pipe is the key element in the scour process, and it is demo...
164 citations
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TL;DR: In this article, the authors present the results of an experimental investigation on scour around piles exposed to waves, including bed shear-stress measurements and a flow visualization study, based on the present data, a design equation is established, relating the scour depth to the Keulegan-carpenter number.
Abstract: This paper presents the results of an experimental investigation on scour around piles exposed to waves. In addition to the actual scour tests, bed shear‐stress measurements and a flow visualization study are carried out. The effects of lee wake and horseshoe vortex are demonstrated to be the two key elements in the scour process. The development of these flow structures mainly depends on the Keulegan‐Carpenter (KC) number that hereby becomes the main parameter that governs the equilibrium scour depth on a live bed. Based on the present data, a design equation is established, relating the scour depth to the Keulegan‐Carpenter number. For the values of the Keulegan‐Carpenter number below six, the scour around the pile practically ceases to exist. The scour depth normalized by the pile diameter is found to increase with increasing Keulegan‐Carpenter number and approaches its steady‐current value for Keulegan‐Carpenter numbers above approximately 100.
266 citations
TL;DR: A numerical model for the description of fluid flow and suspended and bed-load sediment transport is presented in this paper, where density effects are included in the momentum (Reynolds) equations and in the turbulence (kappa and epsilon) equations.
Abstract: A numerical model for the description of fluid flow and suspended and bed-load sediment transport is presented. Density effects are included in the momentum (Reynolds) equations and in the turbulence (kappa and epsilon) equations. Changes in bed levels are calculated from sediment continuity, and the finite-element grid is adapted to the geometry. The Reynolds equations and the transport equation for suspended sediment are solved numerically using a Taylor-Galerkin finite-element method. The flow at a surface mounted cylinder in a steady flow is predicted in good agreement with experiments. Periodic vortex shedding from a cylinder placed above a rigid bed is predicted in good agreement with laboratory experiments, provided that sufficiently detailed grids (approximately 5,000 nodes) are used. Scour calculations are performed for a cylinder in a steady flow with its underside placed at the level of the original flat bed. Predicted scour at a pipeline in steady flow is in good agreement with laboratory measurements reported in the literature.
192 citations
TL;DR: In this article, an experimental study on the onset of scour below and self-burial of pipelines in currents/waves was conducted, where pressure was measured on the surface of a slightly buried pipe at two points, one at the upstream side and the other at the downstream side of the pipe, both in the sand bed.
189 citations
TL;DR: In this paper, the results of an experimental study where the sinking and floatation of a pipeline and other objects (namely, a sphere and a cube) in a silt bed was investigated.
178 citations
TL;DR: In this paper, the results of an experimental study on scour around a pile subject to combined waves and current were presented, where irregular waves were used in the experiments, which were carried out both for normal and irregular waves.
Abstract: This paper presents the results of an experimental study on scour around a pile subject to combined waves and current. Irregular waves were used in the experiments, which were carried out both for ...
178 citations