Simulation Of Tidal Flow Research Articles

Characteristics of Tidal Flow Simulation of Real Tide in West-South Coastal Waters of Korea

Characteristics of Tidal Flow Simulation of Real Tide in West-South Coastal Waters of Korea

Depth-averaged Tidal Flow Simulation by Stabilized Finite Element Formulation in the Ocean Surrounding Indonesia

Depth-averaged Tidal Flow Simulation by Stabilized Finite Element Formulation in the Ocean Surrounding Indonesia

Numerical simulation of tidal flow in Danang Bay Based on non-hydrostatic shallow water equations

This paper presents a numerical simulation of the tidal flow in Danang Bay (Vietnam) based on the non-hydrostatic shallow water equations. First, to test the simulation capability of the non-hydrostatic model, we have made a test simulation comparing it with the experiment by Beji and Battjes 1993, Coastal Engineering 23, 1–16. Simulation results for this case are compared with both the experimental data and calculations obtained from the traditional hydrostatic model. It is shown that the non-hydrostatic model is better than the hydrostatic model when the seabed topography variation is complex. The usefulness of the non-hydrostatic model is father shown by successfully simulating the tidal flow of Danang Bay.

Three-Dimensional Hydrodynamic Simulation of Tidal Flow through a Vegetated Marsh Area

AbstractSimulation of tidal flow in an estuarine marsh area is challenging because of resistance from spatially and temporally varied vegetation. This study simulated the tidal flow in the Davis Pond marsh area near New Orleans, Louisiana, using an open source program. To quantify the time-varying roughness coefficient, four empirical equations for calculating Manning’s roughness coefficient were incorporated into the program in addition to two options offered by the program to calculate the Chezy’s coefficient and one option to use the modified momentum equations and the k−ϵ turbulence model. Results showed that the time-varying roughness coefficient equations accounting for both the degree of submergence and the vegetation frontal area gave the closest matches with the observed data.

Numerical Simulation for Pile Group in Water Flume of 2-D Tidal Flow

In order to study the influence on pile foundation in the numerical Simulation of 2-D tidal flow, the governing equations for numerical model of 2-D tidal flow with pile foundation have been induced, and the numerical water flume of 2-D tidal flow for pile foundation has been built. And then, with an adjusted friction coefficient and an additional roughness coefficient of the pile foundation from some physical model tests, the tidal flow field has been simulated, which was about a piled wharf of the first phase project in Yangshan deep-water Port. It indicated that the results from this numerical simulation were very close to some from water flume tests in laboratory. So some applied foundation and operational methods about the two tidal flow simulation technologies for some pile foundation have been provided.

Euler’s predictor–corrector technique for solving the depth-integrated shallow water equations

Euler’s predictor–corrector technique combined with finite analysis method is applied to solve 2D advection–diffusion shallow water equations. In this algorithm the momentum equations are calculated by the finite analysis method based on a single mesh, while the continuity equation is solved by Euler’s predictor–corrector technique. To verify the performance of this approach, the simulation of tidal flow in the Huangpu estuary is carried out. The numerical results are found to be consistent with the field results, implying that this proposed method is effective and applicable.

An accurate and highly efficient three-dimensional tidal model and its application to Dalian Bay

Accurate prediction of the tidal flow in offshore and coastal waters is the basis for offshore, coastal engineering and ocean environmental studies. Numerical simulation of tidal flow in coastal areas is widely used in these fields. Several numerical methods for the time-dependent twoand three-dimensional equations for the tidal motion are reported in the recent scientific papers, and are now implemented in practical applications. The time integration schemes of these methods range from fully explicit to fully implicit. A fully explicit finite difference method is relatively simple to implement and is easily vectorizable. However, a severe limitation exists for the standard explicit numerical methods owing to the propagation of surface gravity waves, known as the Courant-Friedrich-Lewy (CFL)stability criterion. Several existing numerical models for twoand three-dimensional shallow water flow simulations are based on an alternative direction implicit (ADI)method. ADI methods have superior computational efficiency compared to fully explicit methods because their improved stability allows for the introduction of a larger time step. However, the so-called ADI effect, which is a source of inaccuracy, arises when these methods are used with a large time step in flow domains characterized by complex geometries. And ADI method is primarily applied to two-dimensional calculations because of its complicated nature of the numerical algorithm. To overcome these obstacles of the traditional numerical methods, Casulli introduced a fast and accurate semi-implicit method to calculate tidal waves. In this paper, the algorithm developed by Casulli is explained briefly and numerical experiment is performed to verify its accuracy and efficiency. The model is then applied to Dalian Bay for further verification. This application studies the hydrodynamic conditions, such as the instantaneous current vectors and the tidal residual current, of Dalian Bay.

TIDAL FLOW SIMULATION FOR THE EFFECT OF SEABED CONFIGURATION ON EXCHANGE RATE OF SEA WAFER IN OMURA BAY

Omura Bay in Nagasaki Prefecture, which is almost isolated from the outer sea, is famous for the very low exchange rate of sea water. In the present paper, the authors carry out the tidal flow simulation using the simulation system improved with the automatic control method, and it is discussed that the effect of seabed configuration on the exchange rate of sea water in Omura Bay. At first, it was estimated that the current rate ranges from 0.2 to 0.4%. Secondly, the authors performed the simulation tests with the modified seabed configuration which is cut the sea mount and buried the deep basin, respectively or simultaneously. It was confirmed that there are little changes of tide, the averaged rates become higher than current one and the water mass pattern nearby the bay mouth stretches into the depths of the bay.

Application of artificial neural networks to the simulation of a two dimensional flow

The practice of numerical simulation of flows and other processes occurring in water has now matured into an established and efficient part of hydraulics. At the same time, however, the models themselves often become very extended. In many situations, given the divergence between the response-time requirements and the computational- time requirements of numerical models, the need arises to reduce the time needed to simulate the impact of given input events on hydraulics systems. In this study the possibility of using systems composed of agents consisting only of artificial neural networks (ANNs) as modelling tools for the simulation of tidal flow in a two-dimensional flow field is investigated. In particular this involves the modelling of a process that evolves in time and the ANNs themselves function as non-linear dynamic systems that effectively reproduce the behaviour of the fluid at any one place and any one time from the behavior at other places at earlier times. Different types of ANN-agent architectures are investigated in order to asses their ability and relative performance in encapsulating the sitespecific knowledge and data necessary to reproduce the temporal sequence of states observed in a modelled area.

Generalized wave equation finite-element method for solving two-dimensional tidal waves

The study of tidal circulation has a long history. The numerical simulation of tidal flow has been developed greatly with the development of computer techniques in the past two decades. The generalized wave equation finite-element method is a relatively new numerical model for studying shallow water flow. This method was used to simulate tidal waves of the Gulf of St. Lawrence in Canada. The very good agreement of the numerical results with the field data indicated that the model is an effective and promising numericla method for solving two-dimensional tidal wave problems.

Computer contouring of sea bed topography and finite element simulation of tidal flow in Johor Strait

Computer contouring of sea-bed topography is presented based on Kriging method for the Johor Strait. This automates the input of water depths into a finite element tidal model which is formulated on the shallow water theory. The Galerkin weighted residual technique and the two-step Lax-Wendroff scheme are applied to discretize the vertically integrated governing equations and to advance the numerical solutions in time respectively. The model is assessed against field data. There is a fair degree of agreement between the simulation results and the actual field measurements.

Tidal flow simulation in the English Channel and Southern North Sea

This paper presents the results of the II Tidal Flow Forum experiment of the English Channel and the southern North Sea. The model applies the FADI (falsified alternating direction implicit) scheme and uses the data base of the Tidal Flow Forum. Discrepancies between the model results and the distributed field data of 11 tide stations and 8 tidal current measurement points are shown graphically and are quantified by calculating the RMS (root mean square) errors and the standard deviations. Sensitivity tests have been carried out by changing some parameters (frictions, Coriolis, …). The results which best fit the reference data were obtained by using the Manning's friction law. By doing so, the model can more appropriately adapt the complex bathymetry. The improvements are shown graphically.

Parallel Edge-based Implementation Of The Finite Element MethodFor Shallow Water Equations

A parallel implementation of the fmite element method is presented in this paper, focusing on the fully coupled stabilized solutions of nonlinear systems arising from the discretization of shallow water equations. Edge-based data structures are used in order to optirnize matrix-vector products appearing in the GMRES iterative solver. Numerical examples, including the tidal flow simulation in the coastal lagoon of Araruama, Brazil, show the speed-up of the present implementation, designed for PC clusters running MPI.