書誌事項
- タイトル別名
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- The unsteady simulation for turbulent cavitating flow around a hydrofoil at a low angle of attack
抄録
<p>Large-eddy simulation (LES) of the cavitating turbulent flow around a hydrofoil was conducted. Especially, we focused on the improvement of the reproducibility of the hydrofoil performance under the condition of cavitation when considering the unsteadiness of the flow field sufficiently by LES. The analysis object is the cavitating turbulent flow around a Clark-Y11.7% hydrofoil at the angle-of-attack of 2 degrees. The weak compressibility was taken into account in the governing equation. The cavitation is represented by the cavity source based on the homogeneous fluid model. For LES, the subgrid scale (SGS) eddy viscosity was determined by solving the transport equation of SGS kinetic energy. Typical patterns of cavitation that was observed experimentally for various cavitation number were successfully reproduced: e.g., attached sheet cavitation of steady as well as unsteady modes. The reproducibility of the cavitation characteristics of the hydrofoil was improved in comparison with that by previous Reynolds-averaged turbulence models. In addition, by reducing the cavitation number, the slight increase of lift coefficient was observed before the breakdown. These are due to the streamline curvature around the sheet cavity. We found this feature is related to the unsteady motion of large-scale spanwise vortices. LES revealed that the vortices are intermittently generated by the baroclinic torque originated from the onset of sheet cavitation.</p>
収録刊行物
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- 日本機械学会論文集
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日本機械学会論文集 85 (876), 19-00124-19-00124, 2019
一般社団法人 日本機械学会
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詳細情報 詳細情報について
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- CRID
- 1390282763134062720
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- NII論文ID
- 130007695486
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- ISSN
- 21879761
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
- KAKEN
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- 抄録ライセンスフラグ
- 使用不可