Twin experiments for data assimilation of cavitating flow around a hydrofoil

Okamura, Shungo; Okabayashi, Kie

doi:https://doi.org/10.1016/j.ijmultiphaseflow.2025.105201

Twin experiments for data assimilation of cavitating flow around a hydrofoil

Okamura, Shungo; Okabayashi, Kie

International Journal of Multiphase Flow, 2025, 188, 105201

アクセス数:183件（2025-09-30 10:55 集計）

固定URL: https://hdl.handle.net/11094/101300

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タイトル	Twin experiments for data assimilation of cavitating flow around a hydrofoil
著者	著者名 Okamura, Shungo
著者	NRID 1000040774162 1000040774162 researchmap permalink okakie okakie Scopus Author ID 35320309200 35320309200 ORCID 0000-0001-9682-647X 0000-0001-9682-647X 著者名 Okabayashi, Kie
キーワード等	Cavitation
	Hydrofoil
	Twin experiment
	Local ensemble transform Kalman filter
	Data assimilation
内容	Okamura S., Okabayashi K.. Twin experiments for data assimilation of cavitating flow around a hydrofoil. International Journal of Multiphase Flow 188, 105201 (2025); https://doi.org/10.1016/j.ijmultiphaseflow.2025.105201.
抄録	Twin experiments are conducted to clarify whether assimilation effects can be achieved by data assimilation (DA) with measurement data obtained by existing cavitation flow measurement techniques. The analysis object is the cavitation flow around a Clark-Y11.7% hydrofoil. The pseudo-measurement data are velocity fields from tomographic particle image velocimetry (TPIV) or two-dimensional PIV, both containing missing data in cavity, along with indirectly obtained cavity interface shapes. A large-eddy simulation is used for unsteady simulation of cavitating turbulent flow, and a local ensemble transform Kalman filter is used as the DA method. Visualized flow fields of the ensemble mean show that characteristic phenomena of the pseudo-measurement data are qualitatively reproduced. In addition, the time-series data at an observation point located at the position where the pseudo-measurement data exists converged following the pseudo-measurement data. The velocity inside the cavity, where no pseudo-measurement data exists, is also complemented by CFD that incorporates information from outside of the cavity. However, the complementation performance depends on the accuracy of the cavitation model. This DA program is applied to the real PIV data of single-phase flow and qualitatively reproduces the flow field. Furthermore, the observation noise is reduced and the data outside the measurement domain are complemented.
出版者	Elsevier Ltd
収録物名	International Journal of Multiphase Flow
巻(号)	188
ページ	105201
刊行年月	2025-03-08
言語	英語
ハンドルURL	https://hdl.handle.net/11094/101300
PISSN	03019322
関連情報 (isIdenticalTo)	DOI (出版社版) https://doi.org/10.1016/j.ijmultiphaseflow.2025.105201
アクセス権	open access
権利情報	This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
出版タイプ	Version of Record
カテゴリ	学術雑誌論文 Journal Article

資源タイプ	学術雑誌論文
ローカル資源タイプ	学術雑誌論文
DCMI資源タイプ	text
DCTERMS.bibliographicCitation	International Journal of Multiphase Flow. 2025, 188, p. 105201
DC.title	Twin experiments for data assimilation of cavitating flow around a hydrofoil
DC.creator	Okamura, Shungo
DC.creator	Okabayashi, Kie
DC.publisher	Elsevier Ltd
DC.language' scheme='DCTERMS.RFC1766	英語
DC.type' scheme='DCTERMS.DCMIType	text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2025-03-08
DC.identifier	https://doi.org/10.1016/j.ijmultiphaseflow.2025.105201
DC.subject	Cavitation
	Hydrofoil
	Twin experiment
	Local ensemble transform Kalman filter
	Data assimilation
DC.description	Okamura S., Okabayashi K.. Twin experiments for data assimilation of cavitating flow around a hydrofoil. International Journal of Multiphase Flow 188, 105201 (2025); https://doi.org/10.1016/j.ijmultiphaseflow.2025.105201.
DCTERMS.abstract	Twin experiments are conducted to clarify whether assimilation effects can be achieved by data assimilation (DA) with measurement data obtained by existing cavitation flow measurement techniques. The analysis object is the cavitation flow around a Clark-Y11.7% hydrofoil. The pseudo-measurement data are velocity fields from tomographic particle image velocimetry (TPIV) or two-dimensional PIV, both containing missing data in cavity, along with indirectly obtained cavity interface shapes. A large-eddy simulation is used for unsteady simulation of cavitating turbulent flow, and a local ensemble transform Kalman filter is used as the DA method. Visualized flow fields of the ensemble mean show that characteristic phenomena of the pseudo-measurement data are qualitatively reproduced. In addition, the time-series data at an observation point located at the position where the pseudo-measurement data exists converged following the pseudo-measurement data. The velocity inside the cavity, where no pseudo-measurement data exists, is also complemented by CFD that incorporates information from outside of the cavity. However, the complementation performance depends on the accuracy of the cavitation model. This DA program is applied to the real PIV data of single-phase flow and qualitatively reproduces the flow field. Furthermore, the observation noise is reduced and the data outside the measurement domain are complemented.
DC.rights	This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
DC.format	101300
citation_title	Twin experiments for data assimilation of cavitating flow around a hydrofoil
citation_author	Okamura, Shungo
citation_author	Okabayashi, Kie
citation_publisher	Elsevier Ltd
citation_language	英語
citation_date	2025-03-08
citation_journal_title	International Journal of Multiphase Flow
citation_volume	188
citation_firstpage	105201
citation_doi	https://doi.org/10.1016/j.ijmultiphaseflow.2025.105201
citation_public_url	https://hdl.handle.net/11094/101300

Twin experiments for data assimilation of cavitating flow around a hydrofoil

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