Water Wave Theories and Wave Loads

Karadeniz, H.; Saka, M.P.; Toğan, Vedat

doi:10.1007/978-1-84996-190-5_3

Cited by 3 publications

(3 citation statements)

References 69 publications

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“…A wave of wavelength L and height H in water of depth d, from still water level (SWL), is depicted in Figure 2.5 [11]. η is the water elevation from SWL and m is the wave number.…”

Section: Theorymentioning

confidence: 99%

“…Detailed derivation of the Airy theory is well covered in literature [11,72], and thus only a few crucial steps will be highlighted here. Flow potential ϕ, of irrotational flow must obey Equation 2.39.…”

Section: Theorymentioning

confidence: 99%

“…At the rear of the platform a submersible arm (8) pivots on the steel beam which is raised and lowered by a hydraulic arm (9). The PTO (10) assembly is located at the bottom of the submersible arm and is directly driven by the rotor drive train (11). This eliminates the need to transfer the rotational power from the rotor drive train to the platform surface by the means of mechanical systems, which has reduced the complexity and cost of the RRES.…”

Section: Severity 3 -Reduced Water Flow and Pressurementioning

confidence: 99%

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Transient BEMT models and validation through a sea trial turbine platform

Evans

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Tidal stream turbines (TSTs) have the potential to contribute significantly to the UK energy needs. Currently, the sector is still in a primitive stage and has a relatively high levelised cost of energy compared to other renewable energy sources. A reduction in their cost can be made by improving their design through numerical modelling and physical testing. This thesis will firstly present the classical blade element momentum theory (BEMT) numerical model which is enhanced with additional features (1. foil shape and Reynolds number dependence, and 2. transient turbulence and wave flow fields), which are incorporated to improve the predictions of loads and performance of TSTs. The improvements to the BEMT numerical model are quantified and validated by comparingto empirical data from laboratory testing of five different TSTs (Magallanes ATIR, Sabella D12, IFREMER, Oxford, and Barltrop). This inclusion of the foil shape and Reynolds number dependence in the numerical model has improved the prediction of rotor loads by up to 20%, whilst the inclusion of transient turbulence and wave flow fields has allowed for simulation of TSTs in flow conditions that were not previously possible. Secondly, the thesis presents the design and testing of a 3.0m diameter TST, named remote river energy system (RRES). The BEMT numerical model was used to predict the loads on the turbine which governed its design. A laboratory test rig was built to test the power take-off and pump assemblies prior to deployment at Warrior Way, Pembrokeshire. Valuable knowledge was gained throughout the design and testing stages of the RRES which will improve future developments of TSTs. The improvements made to the BEMT numerical model and testing of the RRES will help lower the levelised cost of energy and increase the attractiveness of TSTs as generators of clean renewable energy.

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“…A wave of wavelength L and height H in water of depth d, from still water level (SWL), is depicted in Figure 2.5 [11]. η is the water elevation from SWL and m is the wave number.…”

Section: Theorymentioning

confidence: 99%

Section: Theorymentioning

confidence: 99%

Section: Severity 3 -Reduced Water Flow and Pressurementioning

confidence: 99%

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Transient BEMT models and validation through a sea trial turbine platform

Evans

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Dynamic analysis of shallow embedded jacket offshore structures under wave forces

Yanzhao

Wang

2022

SN Appl. Sci.

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In this paper, the stress of temporary structures during the construction of offshore structures is analysed through the study of the temporary buried drilling platform. Firstly, The fluid flow is controlled by the modified RANS equation (the Reynolds-average equation) and Forchheimer saturation resistance model, the free surface is tracked by volume of fluid (VOF) method, and the κ–ε closed equation is solved. The finite element numerical simulation software is used to establish a multi-factor coupling calculation model of the stress of temporary buried offshore structures. The maximum wave force of temporary structures under different buried depths, different structural sizes, different load periods and amplitudes is simulated, and the stability of Long Yuan wind turbine pile foundation drilling platform under the maximum wave force is analyzed. The research results of this paper can be used for dynamic design and analysis of wave load conditions, structural design dimensions and load periods in the engineering design of embedded offshore structures in shallow water under wave loads, so as to calculate the wave load values of structures reasonably and provide concrete theoretical basis for the establishment of offshore systems.

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