Please wait, while we are loading the content...
Please wait, while we are loading the content...
Content Provider | The American Society of Mechanical Engineers (ASME) Digital Collection |
---|---|
Author | Wu, Jie Lie, Halvor Carl, M. Larsen Rolf, J. Baarholm |
Copyright Year | 2015 |
Abstract | Steel Catenary Risers (SCRs) are widely used in the development of deepwater oil and gas fields due to their advantages of low manufacturing cost, resistance of high temperature and high pressure, etc. The vertical platform heave motions can cause significant vertical oscillations and hence relative fluid velocities close to the sag-bend area of an SCR. Vortex induced vibrations (VIV) can occur subjected to such periodic variation of relative flow speed. In order to understand the mechanism of heave induced VIV, Statoil has carried out two model tests in the Ocean Basin in Shanghai Jiaotong University in 2012. A straight flexible beam was tested in an oscillatory flow in one of the tests to study the fundamental behaviour of VIV. Heave induced VIV was investigated in the other test, a truncated SCR model was tested with calculated motions at the top end. Recent studies on these experiments have revealed unique features of VIV in an oscillatory flow. The vortex shedding process is more complicated than that of constant flow. One of the reasons for this is that the pipe will interact with the recent shed vortices when it reverses its motion direction, which may amplify the response. VIV response is not only influenced by the reduced velocity, but also Keulegan–Carpenter (KC) number. In addition, different eigen-frequencies of the pipe can be excited and the mode transition is observed due to the variation of the flow speed during one oscillation period. There is still lack of prediction tools to evaluate heave induced VIV. It can be desirable to modify the present empirical VIV prediction tools by including additional effects from oscillatory flow. In the present paper, the vortex shedding process during one oscillation period is approximated by several time spans with constant flows. VIV response at each time span is considered to be controlled by a representative flow speed. The final response will be the sum of the responses at different time spans. A riser system analysis program is used to determine the relative flow speeds along an SCR due to heave motions. Then, an empirical VIV prediction program is used to calculate VIV response at different time spans over one top motion period. The prediction results from this integrated approach are compared with experimental results. |
Sponsorship | Ocean, Offshore and Arctic Engineering Division |
File Format | |
ISBN | 9780791856482 |
DOI | 10.1115/OMAE2015-42065 |
Volume Number | Volume 2: CFD and VIV |
Conference Proceedings | ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering |
Language | English |
Publisher Date | 2015-05-31 |
Publisher Place | St. John’s, Newfoundland, Canada |
Access Restriction | Subscribed |
Subject Keyword | Vortex shedding Arches Oceans Natural gas fields Oscillations Systems analysis High temperature Flow (dynamics) Vortex-induced vibration Pipeline risers High pressure (physics) Fluids Steel catenary risers Vortices Manufacturing Risers (casting) Pipes |
Content Type | Text |
Resource Type | Article |
National Digital Library of India (NDLI) is a virtual repository of learning resources which is not just a repository with search/browse facilities but provides a host of services for the learner community. It is sponsored and mentored by Ministry of Education, Government of India, through its National Mission on Education through Information and Communication Technology (NMEICT). Filtered and federated searching is employed to facilitate focused searching so that learners can find the right resource with least effort and in minimum time. NDLI provides user group-specific services such as Examination Preparatory for School and College students and job aspirants. Services for Researchers and general learners are also provided. NDLI is designed to hold content of any language and provides interface support for 10 most widely used Indian languages. It is built to provide support for all academic levels including researchers and life-long learners, all disciplines, all popular forms of access devices and differently-abled learners. It is designed to enable people to learn and prepare from best practices from all over the world and to facilitate researchers to perform inter-linked exploration from multiple sources. It is developed, operated and maintained from Indian Institute of Technology Kharagpur.
Learn more about this project from here.
NDLI is a conglomeration of freely available or institutionally contributed or donated or publisher managed contents. Almost all these contents are hosted and accessed from respective sources. The responsibility for authenticity, relevance, completeness, accuracy, reliability and suitability of these contents rests with the respective organization and NDLI has no responsibility or liability for these. Every effort is made to keep the NDLI portal up and running smoothly unless there are some unavoidable technical issues.
Ministry of Education, through its National Mission on Education through Information and Communication Technology (NMEICT), has sponsored and funded the National Digital Library of India (NDLI) project.
Sl. | Authority | Responsibilities | Communication Details |
---|---|---|---|
1 | Ministry of Education (GoI), Department of Higher Education |
Sanctioning Authority | https://www.education.gov.in/ict-initiatives |
2 | Indian Institute of Technology Kharagpur | Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project | https://www.iitkgp.ac.in |
3 | National Digital Library of India Office, Indian Institute of Technology Kharagpur | The administrative and infrastructural headquarters of the project | Dr. B. Sutradhar bsutra@ndl.gov.in |
4 | Project PI / Joint PI | Principal Investigator and Joint Principal Investigators of the project |
Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon |
5 | Website/Portal (Helpdesk) | Queries regarding NDLI and its services | support@ndl.gov.in |
6 | Contents and Copyright Issues | Queries related to content curation and copyright issues | content@ndl.gov.in |
7 | National Digital Libarray of India Club (NDLI Club) | Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach | clubsupport@ndl.gov.in |
8 | Digital Preservation Centre (DPC) | Assistance with digitizing and archiving copyright-free printed books | dpc@ndl.gov.in |
9 | IDR Setup or Support | Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops | idr@ndl.gov.in |
Loading...
|