Ramp Tests: A Novel Approach to VIV Model Testing of Flexible Cylinders Using Continuously Varying Towing Speeds
In this paper we present a small portion of the results from the 2011 SHELL tests at the MARINTEK basin. The tests involved towing densely instrumented flexible cylinders at Reynolds numbers up to 150,000 in order to study the Vortex-Induced Vibration (VIV) response in uniform current profiles. This...
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| Format: | Article |
| Language: | en_US |
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American Society of Mechanical Engineers
2017
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| Online Access: | http://hdl.handle.net/1721.1/109257 https://orcid.org/0000-0002-5664-103X https://orcid.org/0000-0002-6144-660X |
| _version_ | 1811076582852263936 |
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| author | Resvanis, Themistocles L Vandiver, John Kim Fu, Shixiao |
| author2 | Massachusetts Institute of Technology. Department of Mechanical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Mechanical Engineering Resvanis, Themistocles L Vandiver, John Kim Fu, Shixiao |
| author_sort | Resvanis, Themistocles L |
| collection | MIT |
| description | In this paper we present a small portion of the results from the 2011 SHELL tests at the MARINTEK basin. The tests involved towing densely instrumented flexible cylinders at Reynolds numbers up to 150,000 in order to study the Vortex-Induced Vibration (VIV) response in uniform current profiles. This paper presents the experimental results collected from a series of tests where the towing speed was continuously varied while the cylinder and carriage traversed the basin. As the cylinder is accelerated (or decelerated) the incident current speed is continuously changing which means that multiple modes can be excited consecutively in a single tow through the basin. These varying towing speed tests are collectively referred to as ‘ramp tests’. The response data collected in these ‘ramp tests’ are presented in terms of CF response amplitudes and strains and are carefully compared with the response data collected during conventional steady towing speed tests. The data shows that when the acceleration of the carriage is kept below a critical value the ‘ramp tests’ are then able to provide VIV response information which is equivalent to that obtained from many constant speed tests. One ramp test provides the equivalent response data of (up to) 10 constant speed tests in a single run. This paper also introduces a dimensionless parameter γ, which determines if the proposed acceleration for a ramp test is within acceptable limits and may be used as a substitute for many constant speed tests. The parameter can be used to determine the appropriate acceleration or deceleration rate in order to ensure that a ramp test will yield suitable VIV response data. The parameter also allows one to know quickly whether or not fully developed VIV is possible in a given set of unsteady flow conditions. |
| first_indexed | 2024-09-23T10:24:27Z |
| format | Article |
| id | mit-1721.1/109257 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T10:24:27Z |
| publishDate | 2017 |
| publisher | American Society of Mechanical Engineers |
| record_format | dspace |
| spelling | mit-1721.1/1092572022-09-26T17:41:21Z Ramp Tests: A Novel Approach to VIV Model Testing of Flexible Cylinders Using Continuously Varying Towing Speeds Resvanis, Themistocles L Vandiver, John Kim Fu, Shixiao Massachusetts Institute of Technology. Department of Mechanical Engineering Resvanis, Themistocles L Vandiver, John Kim Fu, Shixiao In this paper we present a small portion of the results from the 2011 SHELL tests at the MARINTEK basin. The tests involved towing densely instrumented flexible cylinders at Reynolds numbers up to 150,000 in order to study the Vortex-Induced Vibration (VIV) response in uniform current profiles. This paper presents the experimental results collected from a series of tests where the towing speed was continuously varied while the cylinder and carriage traversed the basin. As the cylinder is accelerated (or decelerated) the incident current speed is continuously changing which means that multiple modes can be excited consecutively in a single tow through the basin. These varying towing speed tests are collectively referred to as ‘ramp tests’. The response data collected in these ‘ramp tests’ are presented in terms of CF response amplitudes and strains and are carefully compared with the response data collected during conventional steady towing speed tests. The data shows that when the acceleration of the carriage is kept below a critical value the ‘ramp tests’ are then able to provide VIV response information which is equivalent to that obtained from many constant speed tests. One ramp test provides the equivalent response data of (up to) 10 constant speed tests in a single run. This paper also introduces a dimensionless parameter γ, which determines if the proposed acceleration for a ramp test is within acceptable limits and may be used as a substitute for many constant speed tests. The parameter can be used to determine the appropriate acceleration or deceleration rate in order to ensure that a ramp test will yield suitable VIV response data. The parameter also allows one to know quickly whether or not fully developed VIV is possible in a given set of unsteady flow conditions. SHEAR7 JIP SHELL International Exploration and Production Co. 2017-05-22T17:00:11Z 2017-05-22T17:00:11Z 2015-06 Article http://purl.org/eprint/type/ConferencePaper 978-0-7918-5648-2 http://hdl.handle.net/1721.1/109257 Resvanis, Themistocles L., J. Kim Vandiver, and Shixiao Fu. “Ramp Tests: A Novel Approach to VIV Model Testing of Flexible Cylinders Using Continuously Varying Towing Speeds.” Volume 2: CFD and VIV (May 31, 2015). https://orcid.org/0000-0002-5664-103X https://orcid.org/0000-0002-6144-660X en_US http://dx.doi.org/10.1115/OMAE2015-42286 Volume 2: CFD and VIV Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Society of Mechanical Engineers American Society of Mechanical Engineers (ASME) |
| spellingShingle | Resvanis, Themistocles L Vandiver, John Kim Fu, Shixiao Ramp Tests: A Novel Approach to VIV Model Testing of Flexible Cylinders Using Continuously Varying Towing Speeds |
| title | Ramp Tests: A Novel Approach to VIV Model Testing of Flexible Cylinders Using Continuously Varying Towing Speeds |
| title_full | Ramp Tests: A Novel Approach to VIV Model Testing of Flexible Cylinders Using Continuously Varying Towing Speeds |
| title_fullStr | Ramp Tests: A Novel Approach to VIV Model Testing of Flexible Cylinders Using Continuously Varying Towing Speeds |
| title_full_unstemmed | Ramp Tests: A Novel Approach to VIV Model Testing of Flexible Cylinders Using Continuously Varying Towing Speeds |
| title_short | Ramp Tests: A Novel Approach to VIV Model Testing of Flexible Cylinders Using Continuously Varying Towing Speeds |
| title_sort | ramp tests a novel approach to viv model testing of flexible cylinders using continuously varying towing speeds |
| url | http://hdl.handle.net/1721.1/109257 https://orcid.org/0000-0002-5664-103X https://orcid.org/0000-0002-6144-660X |
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