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RISNumerical Model for Local Scour under Offshore Pipelines
Publisher: American Society of Civil Engineers
Abstract: A numerical model, based on potential-flow theory is proposed for simulating the equilibrium scour hole formed by unidirectional flow underneath offshore pipelines. The model employs a finite-difference method to solve the ...
Numerical Modeling of Local Scour below a Piggyback Pipeline in Currents
Publisher: American Society of Civil Engineers
Abstract: Local scour below a piggyback pipeline in steady currents is investigated numerically. A piggyback pipeline comprises two pipelines that are arranged in the so-called piggyback configuration with the small pipeline being ...
Numerical Model for Wave-Induced Scour below a Submarine Pipeline
Publisher: American Society of Civil Engineers
Abstract: A vertical two-dimensional numerical model for local scour beneath an offshore pipeline exposed to waves is developed in this study. Waves are modeled as sinusoidally oscillatory flows, and the phase-resolved velocity field ...
Prediction of Lee-Wake Scouring of Pipelines in Currents
Publisher: American Society of Civil Engineers
Abstract: A numerical model for the equilibrium profiles of the local scour around pipelines is developed. The numerical model solves the turbulence flow field around the pipeline using a large eddy simulation model in a curvilinear ...
Steady Streaming around a Circular Cylinder near a Plane Boundary due to Oscillatory Flow
Publisher: American Society of Civil Engineers
Abstract: Steady streaming due to an oscillatory flow around a circular cylinder close to and sitting on a plane boundary is investigated numerically. Two-dimensional (2D) Reynolds-averaged Navier-Stokes equations are solved using ...
Influence of Key Environmental Conditions on Microbially Induced Cementation for Soil Stabilization
Publisher: American Society of Civil Engineers
Abstract: Microbially induced calcite precipitation (MICP) is a sustainable biological ground improvement technique that is capable of altering and improving soil mechanical and geotechnical engineering properties. In this paper, ...
Time Scale of Local Scour around Pipelines in Current, Waves, and Combined Waves and Current
Publisher: American Society of Civil Engineers
Numerical Simulation of Two-Degree-of-Freedom Vortex-Induced Vibration of a Circular Cylinder Between Two Lateral Plane Walls in Steady Currents
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Vortex-induced vibration (VIV) of a circular cylinder at a low mass ratio of 1.5 between two lateral walls is investigated numerically. The focus of the study is to examine the effects of ...
Applying Particle Swarm Optimization to Parameter Estimation of the Nonlinear Muskingum Model
Publisher: American Society of Civil Engineers
Abstract: The Muskingum model is the most widely used method for flood routing in hydrologic engineering. However, the application of the model still suffers from a lack of an efficient method for parameter estimation. Particle swarm ...
Optimizing Capacity-Expansion Planning of Groundwater Supply System between Cost and Subsidence
Publisher: American Society of Civil Engineers
Abstract: This work solves an optimal capacity-expansion planning problem with land subsidence constraints using a hybrid algorithm that combines the genetic algorithm (GA) and constrained differential dynamic programming (CDDP). ...