This paper describes the guidelines for preliminary workability analysis for offshore operation and planning using global wave persistence study. In offshore engineering, the weather information has to be studied to select the appropriate path for the project during the concept design, the detail design and the operation plan. The workability analysis is part of the weather study for various offshore operations and this study is used as a guide for the operation schedule, the selection of the operation method, the design of the equipment and the supporting structures. The detailed workability analysis is based on response based simulations which are only available after or during detail system design. On the other hand, preliminary workability can be calculated based on hindcast data with statistical methods before the detail design and this study can lead the project on the appropriate path at the beginning stages. The wave persistence analysis with thresholds on time and wave heights is used for the preliminary workability calculation and can also be used for route planning during offshore transportation. The objective of this paper is to provide global wave persistence analysis data to guide offshore operation and planning and makes the transition to workability with the required working wave period easier. For the global wave persistence analysis, the National Center for Environmental Prediction (NCEP) Climate Forecast System Reanalysis Reforecast (CFSRR) system data was used which has 35-year numerical wave hindcast. Data resolution is 0.5°×0.5° grid size with a temporal resolution of 3 hours for the period from 1979 to 2013, and this database covers most offshore locations except the Caspian Sea, and the North and South Pole areas. The persistence analysis was calculated with 0.5m, 1.0m, 1.5m and 2m wave thresholds, and each wave threshold is categorized as 24 hours, 48 hours and 72 hours persistency.
This paper presents the analyses of the hydrodynamic performance for a marine water-jet propulsor and a rocket engine turbo pump inducer by using a potential flow solver based on a low order panel method. The steady and unsteady fully-wetted and cavitating simulations for the water-jet rotor only problem are investigated and the steady fully-wetted simulation for the inducer is studied in this paper. The convergence studies of rotor averaged cavitating circulation distributions with number of panels on the blade and with different time step sizes are presented in the water-jet case. Finally, the predictions of the hydrodynamic performance for the water-jet pump and the inducer from the present method are validated against existing experimental data or numerical results from RANS solvers.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.