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An investigation of flow-induced vibrations (FIV) during cold testing on a helical tube steam generator for a high-temperature gas-cooled reactor (HTGR).

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Title: An investigation of flow-induced vibrations (FIV) during cold testing on a helical tube steam generator for a high-temperature gas-cooled reactor (HTGR).
Authors: Subhan, Muhammad1,2 (AUTHOR) muha136@brin.go.id, Soemardi, Tresna Priyana1 (AUTHOR) tsoemardi@eng.ui.ac.id, Baskoro, Ario Sunar1 (AUTHOR), Setiadipura, Topan2 (AUTHOR), Latifah, Evi3 (AUTHOR), Abadi, Cecep Slamet3 (AUTHOR), Seong, Jee Hyun4 (AUTHOR)
Source: Annals of Nuclear Energy. Nov2025, Vol. 222, pN.PAG-N.PAG. 1p.
Subjects: Steam generators, Fluid dynamics, Pressure drop (Fluid dynamics), Turbulent flow, Fluid flow
Abstract: • Fluid pressure decreases with mass flow increasing slightly during cold testing. • Natural frequencies and shedding frequency highlight resonance risks when frequencies align. • Reynolds's number and Dean's number confirm turbulent flow, emphasizing uneven pressure distribution and vibration risks. • Findings provide insights into mitigating flow-induced vibrations and improving stability and reliability in high-temperature gas reactor systems. Flow-induced vibration (FIV) is a critical phenomenon where the interaction between flowing fluid and structural elements, such as pipes or tubes, results in vibrations, which may compromise system integrity. This research aims to model and simulate the behavior of a helical tube steam generator designed for High-Temperature Gas Reactors (HTGRs), employing the latest ANSYS software licensed by BRIN. The study addresses the problem of understanding fluid flow on steam generators' vibration characteristics to improve their stability and reliability. This work analyzes the system's pressure distribution, mass flow, and vibration frequencies under cold testing and turbulent conditions. The findings of this research lie in its specific focus on identifying risks of flow-induced vibrations under non-thermal conditions, an area that is rarely studied but essential for evaluating mechanical reliability during cold testing scenarios. This approach fosters a deeper understanding of the pure impact of fluid dynamics on tube structures without the complications of thermal phenomena. The one-way FSI method with external load was chosen over system coupling because it directly maps fluid-induced forces to the structural domain without requiring repeated bidirectional convergence. This approach is computationally efficient and has been extensively validated for scenarios where fluid-to-structure interactions dominate. Results indicated a pressure drop from 16 MPa at the inlet to 15.3 MPa at the outlet. Modal analysis revealed a range of natural frequencies from 0.32 Hz to 28.35 Hz. Additionally, the calculated flow-induced shedding frequency was 39.7 Hz, while the natural frequency of the helical tube stood at 16.25 Hz. The Reynolds number (Re) and Dean number (De) were determined to be 48,921 and 50,383, respectively, confirming the presence of turbulent flow. The study highlights the risk of resonance when the natural frequency approaches the shedding frequency, which could lead to excessive vibrations and potential structural damage. These findings provide valuable insights for developing safer and more efficient steam generators. [ABSTRACT FROM AUTHOR]
Copyright of Annals of Nuclear Energy is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 185873075
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: An investigation of flow-induced vibrations (FIV) during cold testing on a helical tube steam generator for a high-temperature gas-cooled reactor (HTGR).
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  Data: <searchLink fieldCode="AR" term="%22Subhan%2C+Muhammad%22">Subhan, Muhammad</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> muha136@brin.go.id</i><br /><searchLink fieldCode="AR" term="%22Soemardi%2C+Tresna+Priyana%22">Soemardi, Tresna Priyana</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> tsoemardi@eng.ui.ac.id</i><br /><searchLink fieldCode="AR" term="%22Baskoro%2C+Ario+Sunar%22">Baskoro, Ario Sunar</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Setiadipura%2C+Topan%22">Setiadipura, Topan</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Latifah%2C+Evi%22">Latifah, Evi</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Abadi%2C+Cecep+Slamet%22">Abadi, Cecep Slamet</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Seong%2C+Jee+Hyun%22">Seong, Jee Hyun</searchLink><relatesTo>4</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Annals+of+Nuclear+Energy%22">Annals of Nuclear Energy</searchLink>. Nov2025, Vol. 222, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Steam+generators%22">Steam generators</searchLink><br /><searchLink fieldCode="DE" term="%22Fluid+dynamics%22">Fluid dynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Pressure+drop+%28Fluid+dynamics%29%22">Pressure drop (Fluid dynamics)</searchLink><br /><searchLink fieldCode="DE" term="%22Turbulent+flow%22">Turbulent flow</searchLink><br /><searchLink fieldCode="DE" term="%22Fluid+flow%22">Fluid flow</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: • Fluid pressure decreases with mass flow increasing slightly during cold testing. • Natural frequencies and shedding frequency highlight resonance risks when frequencies align. • Reynolds's number and Dean's number confirm turbulent flow, emphasizing uneven pressure distribution and vibration risks. • Findings provide insights into mitigating flow-induced vibrations and improving stability and reliability in high-temperature gas reactor systems. Flow-induced vibration (FIV) is a critical phenomenon where the interaction between flowing fluid and structural elements, such as pipes or tubes, results in vibrations, which may compromise system integrity. This research aims to model and simulate the behavior of a helical tube steam generator designed for High-Temperature Gas Reactors (HTGRs), employing the latest ANSYS software licensed by BRIN. The study addresses the problem of understanding fluid flow on steam generators' vibration characteristics to improve their stability and reliability. This work analyzes the system's pressure distribution, mass flow, and vibration frequencies under cold testing and turbulent conditions. The findings of this research lie in its specific focus on identifying risks of flow-induced vibrations under non-thermal conditions, an area that is rarely studied but essential for evaluating mechanical reliability during cold testing scenarios. This approach fosters a deeper understanding of the pure impact of fluid dynamics on tube structures without the complications of thermal phenomena. The one-way FSI method with external load was chosen over system coupling because it directly maps fluid-induced forces to the structural domain without requiring repeated bidirectional convergence. This approach is computationally efficient and has been extensively validated for scenarios where fluid-to-structure interactions dominate. Results indicated a pressure drop from 16 MPa at the inlet to 15.3 MPa at the outlet. Modal analysis revealed a range of natural frequencies from 0.32 Hz to 28.35 Hz. Additionally, the calculated flow-induced shedding frequency was 39.7 Hz, while the natural frequency of the helical tube stood at 16.25 Hz. The Reynolds number (Re) and Dean number (De) were determined to be 48,921 and 50,383, respectively, confirming the presence of turbulent flow. The study highlights the risk of resonance when the natural frequency approaches the shedding frequency, which could lead to excessive vibrations and potential structural damage. These findings provide valuable insights for developing safer and more efficient steam generators. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Annals of Nuclear Energy is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.anucene.2025.111597
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Steam generators
        Type: general
      – SubjectFull: Fluid dynamics
        Type: general
      – SubjectFull: Pressure drop (Fluid dynamics)
        Type: general
      – SubjectFull: Turbulent flow
        Type: general
      – SubjectFull: Fluid flow
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    Titles:
      – TitleFull: An investigation of flow-induced vibrations (FIV) during cold testing on a helical tube steam generator for a high-temperature gas-cooled reactor (HTGR).
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            NameFull: Subhan, Muhammad
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            NameFull: Soemardi, Tresna Priyana
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            – D: 01
              M: 11
              Text: Nov2025
              Type: published
              Y: 2025
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              Value: 222
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