Development of a nested coastal circulation model: Boundary error reduction

Hartnett, Michael

doi:10.1016/j.envsoft.2013.11.007

Cited by 12 publications

(10 citation statements)

References 36 publications

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“…The highest resolution of 2 m set for this study was dictated solely by the resolution of available lidar data, and higher resolutions are easily achievable if suitable terrain data are available. For example, a 0.025 m resolution was used to simulate flows corresponding to those in a physical scale model of a harbour of dimensions 1.0 × 1.0 × 0.25 m (Nash and Hartnett, 2014). In this way, the model allows improved accuracy of solution when compared to a lowerresolution parent model where the improved accuracy is similar to that of a similar high-resolution single-grid model, but the computational effort is significantly reduced.…”

Section: Discussionmentioning

confidence: 99%

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Development of high-resolution multi-scale modelling system for simulation of coastal-fluvial urban flooding

Comer

Olbert

Hartnett

2017

Nat. Hazards Earth Syst. Sci.

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Abstract. Urban developments in coastal zones are often exposed to natural hazards such as flooding. In this research, a state-of-the-art, multi-scale nested flood (MSN_Flood) model is applied to simulate complex coastal-fluvial urban flooding due to combined effects of tides, surges and river discharges. Cork city on Ireland's southwest coast is a study case. The flood modelling system comprises a cascade of four dynamically linked models that resolve the hydrodynamics of Cork Harbour and/or its sub-region at four scales: 90, 30, 6 and 2 m.Results demonstrate that the internalization of the nested boundary through the use of ghost cells combined with a tailored adaptive interpolation technique creates a highly dynamic moving boundary that permits flooding and drying of the nested boundary. This novel feature of MSN_Flood provides a high degree of choice regarding the location of the boundaries to the nested domain and therefore flexibility in model application. The nested MSN_Flood model through dynamic downscaling facilitates significant improvements in accuracy of model output without incurring the computational expense of high spatial resolution over the entire model domain. The urban flood model provides full characteristics of water levels and flow regimes necessary for flood hazard identification and flood risk assessment.

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Section: Discussionmentioning

confidence: 99%

“…Extensive numerical testing showed that the most stable and accurate model solution could be achieved by implementing the Dirichlet boundary condition. Accuracies of various interpolation and boundary condition schemes were analysed and compared in Nash and Hartnett (2014).…”

Section: Nesting Structure and Proceduresmentioning

confidence: 99%

Development of high-resolution multi-scale modelling system for simulation of coastal-fluvial urban flooding

Comer

Olbert

Hartnett

2017

Nat. Hazards Earth Syst. Sci.

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“…The model allows both one-way and two-way nesting. MSN has been extensively tested and validated for experimental and natural test cases (see [21][22][23] for details). (Note: MSN was in turn developed from the hydro-biological model DIVAST (depth integrated velocity and solute transport) [24] which has also been widely used and validated (e.g., [25,26])).…”

Section: Methodsmentioning

confidence: 99%

“…This is an extension of the multi-scale nested model (MSN) developed at National University of Ireland Galway by Dr. Stephen Nash and Prof Michael Hartnett in 2009 [21][22][23]. MSN is a 2D, depth-averaged, finite difference, nested model which is based on the solution of the Navier-Stokes equations and takes account of the effects of local and advective accelerations, earth's rotation, barotropic and free surface pressure gradients, wind action, bed resistance and turbulence.…”

Section: Methodsmentioning

confidence: 99%

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Towards a Low-Cost Modelling System for Optimising the Layout of Tidal Turbine Arrays

Olbert

Hartnett

2015

Energies

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Abstract:In the long-term, tidal turbines will most likely be deployed in farms/arrays where energy extraction by one turbine may significantly affect the energy available to another turbine. Given the prohibitive cost of experimental and/or field investigations of such turbine interactions, numerical models can play a significant role in determining the optimum layout of tidal turbine arrays with respect to energy capture. In the present research, a low-cost modelling solution for optimising turbine array layouts is presented and assessed. Nesting is used in a far-field model to telescope spatial resolution down to the scale of the turbines within the turbine array, allowing simulation of the interactions between adjacent turbines as well as the hydrodynamic impacts of individual turbines. The turbines are incorporated as momentum sinks. The results show that the model can compute turbine wakes with similar far-field spatial extents and velocity deficits to those measured in published experimental studies. The results show that optimum spacings for multi-row arrays with regard to power yield are 3-4 rotor diameters (RD) across-stream and 1-4 RD along-stream, and that turbines in downstream rows should be staggered to avoid wake effects of upstream turbines and to make use of the accelerated flows induced by adjacent upstream turbines.

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Smoothed particle hydrodynamics method with partially defined fluid particles

Kanetsuki

Wells

Nakata

2016

Math Methods in App Sciences

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This paper presents a method for nested fluid simulation based on smoothed particle hydrodynamics. Given suitable background flow information of an “external flow” as it evolves in time, our method simulates the motion of particles only within a local material region. In order to perform the simulation, the background physical quantities need to be transferred to the local fluid particles. We employ ghost particles to carry the given physical quantities to the nested fluid. We also solve the problem of density computation appropriately for the ghost particles. Our numerical tests show that accurate local fluid motion can be obtained in such a nested volume of fluid particles. Copyright © 2016 John Wiley & Sons, Ltd.

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Development of a nested coastal circulation model: Boundary error reduction

Cited by 12 publications

References 36 publications

Development of high-resolution multi-scale modelling system for simulation of coastal-fluvial urban flooding

Development of high-resolution multi-scale modelling system for simulation of coastal-fluvial urban flooding

Towards a Low-Cost Modelling System for Optimising the Layout of Tidal Turbine Arrays

Smoothed particle hydrodynamics method with partially defined fluid particles

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