文献一覧: 松山新吾 (著者)

The Cartesian grid-based CFD is very easy to generate a grid and can be easily applied to the analysis of complex geometries. These requirements are essential for CFD to become a general-purpose tool that can be used by beginners, and the Cartesian grid-based CFD is one of the most promising candidates. On the other hand, it is recognized that the Cartesian grid method still has some problems in reproducing object shapes and handling solid wall boundaries compared to CFD with boundary-fitted grids because the cell interfaces do not fit to the object surface. In this paper, we introduce the “Workshop on Cartesian Grid-based CFD” held at the Fluid Dynamics Conference / Aerospace Numerical Simulation Symposium (held at the end of June or the beginning of July every year). In this workshop, we set up benchmark problems to solve the aforementioned problems, and asked participants to bring the results to the workshop for discussion to improve Cartesian grid-based CFD. We introduce the results of the last workshop and would like to invite new participants to the workshop.

2023-04-09 17:33:30
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2 0 0 0 OA JAXAにおける回転デトネーションロケットエンジンの基礎的波面現象の解明および性能実証への取り組み

著者: 岩田和也松山新吾小島淳布目佳央川島秀人丹野英幸水書稔治
出版者: 一般社団法人日本燃焼学会
雑誌: 日本燃焼学会誌 (ISSN:13471864)
巻号頁・発行日: vol.62, no.200, pp.94-102, 2020 (Released:2020-06-13)
参考文献数: 24

Japan Aerospace Exploration Agency has now been working to understand detailed morphologies of detonation wave encountered in Rotating Detonation Rocket Engine (RDRE), which is one of the most potential engine concepts for light-weight and compact rocket system, and to investigate how they influence thrust performance and operational stability of the engine. Combustion experiments of an annular RDRE propelled by gaseous methane and oxygen were conducted to measure thrust performance and to visualize detonation propagation and CH*/OH* chemiluminescence, from which specific thrust was revealed close to the theoretical value with stable propagation modes, and without throat contraction. CH* chemiluminescence also indicated deflagrative combustion anchoring at the injection plane, which could partly explain the performance degradation in a configuration with throat. Experimentally observed detonation velocity ranged 45-75 % of Chapman-Jouguet (C-J) velocity, which was partly confirmed to be induced by incomplete mixing from the results of two/three-dimensional simulation employing detailed chemical kinetics. However, numerically predicted velocity was higher by several tens of percentage, indicating potential influence of thermal/viscous loss to the confinement. Overall, physical insight was achieved into non-ideal behavior of detonation including strongly curved wave front induced by incomplete mixing and our findings emphasizes a need for better mixing techniques to achieve more ideal characteristics of detonation.

2021-07-29 17:39:06
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1 0 0 0 OA 第3回直交格子CFDワークショップについて

著者: 松山新吾 MATSUYAMA Shingo
出版者: 宇宙航空研究開発機構(JAXA)
雑誌: 宇宙航空研究開発機構特別資料: 第3回直交格子CFDワークショップ講演集 = JAXA Special Publication: Proceedings of the 3rd Workshop on Cartesian Grid-based CFD (ISSN:24332232)
巻号頁・発行日: vol.JAXA-SP-22-008, pp.35-45, 2023-02-03

第3回直交格子CFDワークショップ (2022年7月1日. いわて県民情報交流センター(アイーナ)), 盛岡市, 岩手

2023-04-09 15:37:27
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http://id.nii.ac.jp/1696/00049041/

1 0 0 0 D-113 近接連星系における降着円盤の輻射輸送を伴った 3 次元数値シミュレーション

著者: 佐藤潤一澤田恵介松山新吾大西直文
出版者: 日本流体力学会
雑誌: 日本流体力学会年会講演論文集 (ISSN:13428004)
巻号頁・発行日: vol.2003, pp.114-115, 2003-07-28

Three-dimensional numerical simulations of an accretion disc in a close binary system were performed by solving the Euler equations with radiative transfer. We used the one-dimensional (tangent-slab) approximation to calculate the radiative transfer for the vertical directions of the disc. The cooling effect of the disc is considered by discharging energy in only this directions. The influence of radiative cooling has been accounted for by assuming a specific heat ratio γ which is smaller than that of a mono-atomic gas (=5/3). In the present study, the specific heat ratio was assumed to be constant while radiative cooling effect was included as the non-adiabatic process. Our numerical simulations with radiative transfer demonstrated that spiral shocks existed in three-dimensional disc. It was found that its feature approached in the case of a lower γ but its tendency was weaker than that of two-dimensional simulation.

2010-10-03 17:00:14
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https://ci.nii.ac.jp/naid/110003948264