17,783 research outputs found
Dataset - Experimental Data of a Hexagonal Floating Structure under Waves
No full textFloating structures have a wide range of application and shapes. This experimental investigations observes a hexagonal floating structure under wave conditions for three different draft configurations. Regular waves as well as a range of white noise tests were conducted to quantify the response amplitude operator (RAO). Further irregular waves focused on the survivability of the floating structure. The presented dataset includes wave gauge data as well as 6 degree of freedom motion measurement to quantify the response only restricted by a soft mooring system. Additional analysis include the measurement of the mass properties of the individual configuration, natural frequency of the mooring system as well as the comparison between requested and measured wave heights. This allow to use the provided dataset as a validation experiment. This research was carried out at the FloWave Ocean Energy Research Facility of the Institute for Energy Systems, University of Edinburgh
CAD files for the Swing to measure the Centre of Gravity and Moment of Inertia
No full textThe dataset provides the CAD files describing the swing, which is available in FloWave Ocean Energy Research Facility. The described experimental setup can be used to measure the centre of gravity and the moment of inertia with one degree of freedom. The swing is supported by two movable frames. Two different pivot axes are available and the measurement process as well as the analysis is presented in a separate paper. The provided files allow to check how a potential model can be placed on the swing and supports the usage of this device. Four different types of files are available: IGES (igs), ACIS (sat), STL Stereolithography (stl) and Rhinoceros (3dm). The geometry was constructed in mm
Additional Experimental Data of a Floating Cylinder in a Wave Tank - Verification Experiments
No full textThe presented experimental results provide additional data to a previously published investigation of a floating cylinder under regular wave conditions (https://doi.org/10.7488/ds/2627). Three test series are added to investigate the roll response of the water filled structure. This includes a change of the initial position of the cylinder in the wave tank as well as a rotation of the wave direction. The latter was also conducted for the solid ballast option to provide a direct comparison with the water filled cylinder.
This research was carried out at the FloWave Ocean Energy Research Facility of the Institute for Energy Systems, University of Edinburgh
Experimental Data of a Floating Cylinder in a Wave Tank – Comparison Solid and Water Ballast
No full textThe experimental set-up allows for the comparison of two different ballast options of a floating cylinder in a wave tank. Four different internal water drafts are tested as well as an equivalent solid ballast option. The model is excited by regular waves which are characterised with five wave gauges in front of the floating cylinder and two behind. Additionally, the time series of the six-degree of freedom response of the floating structure is made available. Regular waves with an initial amplitude of 0.05 m and frequencies over the range 0.3 to 1.1 Hz are investigated. This results in a wide range of different responses of the floating structure as well as very big rotations of up to 20 degrees. This data-set allows for identification of the influence caused by the sloshing of the interior water volume and can be used to validate numerical models of fluid-structure-fluid interaction. This research was carried out at the FloWave Ocean Energy Research Facility of the Institute for Energy Systems, University of Edinburgh
Geometry generation for DHV tidal turbine – Basic Python code and implementation in ANSYS-CFX and Rhinoceros
No full textThe flow speed which acts on tidal turbines can be increased based on a wide range of approaches. A unique feature of the Davidson Hill Venturi (DHV) turbine is the Venturi shaped structure is produced from individual hydrofoils. This concept includes further parameters, which can be in- dividually changed to find an overall optimum solution. As part of the research project, a general geometry description is provided, which describes the form of the structure by utilising two sym- metrical bell curves. A Phyton script allows the generation of this geometry based on simple inputs. Furthermore, the exemplary integration of this in ANSYS-CFX via SpaceClaim is provided in this dataset. This includes the script file, an example Workbench and a video showing the build-up. An additional Grasshopper code allows to integrate the geometry generation in the CAD software Rhinoceros to allow more complex geometries. The presented data can help to improve the gener- alisation of future optimisation work on this tidal turbine
Dataset - Bottom Pressure and Free Surface Elevation Including Waves and Current Interaction
No full textForce plates are commonly used in tank testing to measure loads acting on the foundation of a structure. These targeted measurements are overlaid by the hydrostatic and dynamic pressure acting on the force plate induced by the waves and currents. This paper presents the dataset of bottom force measurement with a six degree-of-freedom force plate (AMTI OR6-7 1000, surface area 0.464 m×0.508 m) combined with synchronised measurements of surface elevation and current velocity. The data covers a wave frequencies between 0.2 to 0.7 Hz and wave direction between 0◦ and 180◦. These variations are provided for 0 and 0.2 m/s current speed and a variation of current in the absence of waves covering 0 to 0.45 m/s. The dataset can be utilised as a validation dataset for models predicting bottom pressure based on free surface elevation. Additionally, the dataset provides the wave and current induced load acting on the specific load cell and a fixed water depth of 2 m, which can subsequently be removed to obtain the often-desired measurement of structural loads. This research was carried out at the FloWave Ocean Energy Research Facility of the Institute for Energy Systems, University of Edinburgh
After Sulla: study in the settlement and material culture of the Piraeus peninsula in the Roman and Late Roman period
No full textModem text-based and ancient historical accounts take the sack of Piraeus, the port of Athens in Greece, by the Romans under Sulla in 86 ВС as the terminal point of the history of the area in antiquity. Archaeological work on the town has tended so far to regard the post-Classical phases of the settlement as less interesting than those marking the 'heyday' of the port in the Classical period. This thesis explores the nature and scale of settlement in the area in the centuries spanning the town's destruction by the Romans in 86 ВС and the Late Roman period. The study is based on a re-assessment of archaeological data from old and recent rescue excavations in the modem town up to 1997. It also presents and discusses in detail the results of post-excavation work by the author on unpublished material from an extensive site excavated in the early 1980s, These results are compared to and synthesized with epigraphic and other testimonies to answer questions about the nature of settlement and the degree of social and cultural change in the area during the period in focus. The discussion focuses in particular on; 1) exploring continuity and change in the settlement patterns, demography and topography of the town, 2) the changing nature of domestic space and its organization, and 3) investigating patterns of pottery consumption and trade. These issues are examined in the context of the social, economic and cultural changes documented for the Roman imperial and Late Roman period by previous archaeological fieldwork and excavations in the region of southern Greece and the Aegean
A re-examination of the evidence for parade-grounds at auxiliary forts in Roman Britain
No full textThis Thesis examines the underlying evidence for parade-grounds at auxiliary forts in Roman Britain. Firstly by examining the evidence supporting forts with actual physical remains, such as the altars and the tribunal at Maryport and the artificially levelled area at Hardknott, and those with flagged areas which have been interpreted as parade-grounds, such as Ambleside and Gelligaer. The literary evidence of ancient authors is examined with particular reference to training and exercising and where this might have been undertaken. The occasions when a parade might have been appropriate in Roman times are examined, as is the possibility of a modem concept being superimposed on an ancient action
Re-Thinking Ritual Traditions: Interpreting Structured Deposition in Watery Contexts in Late Pre-Roman Iron Age and Roman Britain
No full textThis investigation seeks to define the strands of continuity and change in structured deposition across the Late Pre-Roman Iron Age to Early Roman transition in Britain, and interpret their significance in terms of cultural interaction. These interpretations not only examine and re-think structured deposition in relation to ritual traditions, but also explore how the continuity of such traditions was impacted by the transition between these two periods. Metalwork is a central focus but a wide range of other finds are also considered in order to take a holistic perspective on deposition. Watery deposits were an obvious starting point but comparisons with dry context deposits were necessary to provide a more complete understanding of these practices. The data were gathered from a number of individual sites throughout two contrasting case study zones defined by major waterways and labelled as such: the Severn-Thames Axis in the south and the Solway-Forth Axis in the north of Britain. Through the use of site reports as the main source of data, the analysis took a two-tiered approach. Individual episodes of structured deposition were examined and interpreted on a site-by-site basis. This then led to investigations on a broader scale by examining changes in the continuity of practices in the type of finds deposited, the contexts into which deposition took place and pre-deposition practices, such as deliberate breakage to determine patterns of deposition across the case study zones as a whole. With this comparative analysis it can be concluded that watery contexts were not a unique locus of structured deposition, and indeed that this practice is highly diverse across the zones studied. The tempora
The Empire, the Land, and the Exodus: A Study of How the Roman Empire Literally Shaped Christianity: 1 C.E. - 280 C.E.
No full textThis paper explores the factors and trends involved in the movement of Christian communities from Palestine into Asia Minor and regions west of the Aegean Sea. Because the first generation of Christians generally continued to identify themselves as Jewish, this paper looks into the factors that affected the Jewish community with the perspective that a large portion of the early Christians were still members of the Jewish community. Roman land control policies, taxation, and continuous loss and division of land all but pushed many Jews out of the region while the peace of Augustus led many more to depart more voluntarily. It was the culmination of all these factors that led to Jewish emigration from the Palestinian region. The paper will begin with a brief history of the birth of Christianity and the Jewish-Roman relationship in Palestine, followed by a discussion of factors that led to emigration from Palestine, and then end with an analysis of the locations of the Christian communities
- …
