Twin experiments for data assimilation of cavitating flow around a hydrofoil

Okamura, Shungo; Okabayashi, Kie

International Journal of Multiphase Flow, 2025, 188, 105201

Number of Access:144（2025-08-14 01:47 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/101300

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Title
Twin experiments for data assimilation of cavitating flow around a hydrofoil
Creator
CreatorName
Okamura, Shungo
NRID
1000040774162 1000040774162
researchmap permalink
okakie okakie
Scopus Author ID
35320309200 35320309200
ORCID
0000-0001-9682-647X 0000-0001-9682-647X
CreatorName
Okabayashi, Kie
Subject
Cavitation
Hydrofoil
Twin experiment
Local ensemble transform Kalman filter
Data assimilation
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.
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.
Publisher
Elsevier Ltd
Source Title
International Journal of Multiphase Flow
Volume (Issue)
188
Page
105201
Date of Issued
2025-03-08
Language
English
Handle URL
https://hdl.handle.net/11094/101300
PISSN
03019322
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.1016/j.ijmultiphaseflow.2025.105201
Access Rights
open access
CopyRight
This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
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Category
学術雑誌論文 Journal Article