Computation of Added Mass and Damping Coefficients of a Horizontal Circular Cylinder in Open Foam

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Abstract

This paper presents numerical computation of added massand damping coefficients of a slender horizontal cylinder in thefree surface zone, which typically serves as a fish cage floater. A fully viscous two phase flow solver in OpenFOAM was employed in the numerical computation. The purpose was to validate the capability of this solver and dynamic mesh functionality. A two dimensional numerical wave tank was set up, and two wave relaxation zones were used to reduce the size of the computational domain. Harmonic forced oscillations of the cylinder were performed at different frequencies and amplitudes. The mesh at free surface zone was refined based on the radiated wave heights at different oscillation frequencies in order to properly resolve the radiated waves. The result shows that in most frequency ranges, the numerical computation agreed well with the experimental data and analytical solution. However at low frequency range for added mass coefficient in heave motion, deviations were observed, and it was due to the effect of finite water depth. In addition for sway motion at high frequency range, the damping coefficient was underestimated comparing with analytical solution. This was believed to be as a result of high steepness of the radiated waves.
Original languageEnglish
Title of host publicationProceedings of the ASME 35th International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2016)
Number of pages8
PublisherAmerican Society of Mechanical Engineers
Publication date2016
Article numberOMAE2016-54429
ISBN (Electronic)978-0-7918-4993-4
DOIs
Publication statusPublished - 2016
EventASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering (OMAE2016) - Busan, Korea, Republic of
Duration: 19 Jun 201624 Jun 2016

Conference

ConferenceASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering (OMAE2016)
CountryKorea, Republic of
CityBusan
Period19/06/201624/06/2016

Cite this

Chen, H., & Christensen, E. D. (2016). Computation of Added Mass and Damping Coefficients of a Horizontal Circular Cylinder in Open Foam. In Proceedings of the ASME 35th International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2016) [OMAE2016-54429] American Society of Mechanical Engineers. https://doi.org/10.1115/OMAE2016-54429
Chen, Hao ; Christensen, Erik Damgaard. / Computation of Added Mass and Damping Coefficients of a Horizontal Circular Cylinder in Open Foam. Proceedings of the ASME 35th International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2016). American Society of Mechanical Engineers, 2016.
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title = "Computation of Added Mass and Damping Coefficients of a Horizontal Circular Cylinder in Open Foam",
abstract = "This paper presents numerical computation of added massand damping coefficients of a slender horizontal cylinder in thefree surface zone, which typically serves as a fish cage floater. A fully viscous two phase flow solver in OpenFOAM was employed in the numerical computation. The purpose was to validate the capability of this solver and dynamic mesh functionality. A two dimensional numerical wave tank was set up, and two wave relaxation zones were used to reduce the size of the computational domain. Harmonic forced oscillations of the cylinder were performed at different frequencies and amplitudes. The mesh at free surface zone was refined based on the radiated wave heights at different oscillation frequencies in order to properly resolve the radiated waves. The result shows that in most frequency ranges, the numerical computation agreed well with the experimental data and analytical solution. However at low frequency range for added mass coefficient in heave motion, deviations were observed, and it was due to the effect of finite water depth. In addition for sway motion at high frequency range, the damping coefficient was underestimated comparing with analytical solution. This was believed to be as a result of high steepness of the radiated waves.",
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Chen, H & Christensen, ED 2016, Computation of Added Mass and Damping Coefficients of a Horizontal Circular Cylinder in Open Foam. in Proceedings of the ASME 35th International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2016)., OMAE2016-54429, American Society of Mechanical Engineers, ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering (OMAE2016), Busan, Korea, Republic of, 19/06/2016. https://doi.org/10.1115/OMAE2016-54429

Computation of Added Mass and Damping Coefficients of a Horizontal Circular Cylinder in Open Foam. / Chen, Hao; Christensen, Erik Damgaard.

Proceedings of the ASME 35th International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2016). American Society of Mechanical Engineers, 2016. OMAE2016-54429.

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

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N2 - This paper presents numerical computation of added massand damping coefficients of a slender horizontal cylinder in thefree surface zone, which typically serves as a fish cage floater. A fully viscous two phase flow solver in OpenFOAM was employed in the numerical computation. The purpose was to validate the capability of this solver and dynamic mesh functionality. A two dimensional numerical wave tank was set up, and two wave relaxation zones were used to reduce the size of the computational domain. Harmonic forced oscillations of the cylinder were performed at different frequencies and amplitudes. The mesh at free surface zone was refined based on the radiated wave heights at different oscillation frequencies in order to properly resolve the radiated waves. The result shows that in most frequency ranges, the numerical computation agreed well with the experimental data and analytical solution. However at low frequency range for added mass coefficient in heave motion, deviations were observed, and it was due to the effect of finite water depth. In addition for sway motion at high frequency range, the damping coefficient was underestimated comparing with analytical solution. This was believed to be as a result of high steepness of the radiated waves.

AB - This paper presents numerical computation of added massand damping coefficients of a slender horizontal cylinder in thefree surface zone, which typically serves as a fish cage floater. A fully viscous two phase flow solver in OpenFOAM was employed in the numerical computation. The purpose was to validate the capability of this solver and dynamic mesh functionality. A two dimensional numerical wave tank was set up, and two wave relaxation zones were used to reduce the size of the computational domain. Harmonic forced oscillations of the cylinder were performed at different frequencies and amplitudes. The mesh at free surface zone was refined based on the radiated wave heights at different oscillation frequencies in order to properly resolve the radiated waves. The result shows that in most frequency ranges, the numerical computation agreed well with the experimental data and analytical solution. However at low frequency range for added mass coefficient in heave motion, deviations were observed, and it was due to the effect of finite water depth. In addition for sway motion at high frequency range, the damping coefficient was underestimated comparing with analytical solution. This was believed to be as a result of high steepness of the radiated waves.

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PB - American Society of Mechanical Engineers

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Chen H, Christensen ED. Computation of Added Mass and Damping Coefficients of a Horizontal Circular Cylinder in Open Foam. In Proceedings of the ASME 35th International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2016). American Society of Mechanical Engineers. 2016. OMAE2016-54429 https://doi.org/10.1115/OMAE2016-54429