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SPH法による砕波の散逸現象のシミュレーション
https://doi.org/10.15102/1394.00000641
https://doi.org/10.15102/1394.00000641148cb046-27c5-4124-8acd-5d3354220274
名前 / ファイル | ライセンス | アクション |
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Full-Text (10.6 MB)
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Final Exam Abstract (42.9 kB)
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Item type | 学位論文 / Thesis or Dissertation(1) | |||||||
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公開日 | 2018-08-31 | |||||||
タイトル | ||||||||
言語 | ja | |||||||
タイトル | SPH法による砕波の散逸現象のシミュレーション | |||||||
タイトル | ||||||||
言語 | en | |||||||
タイトル | Development of an SPH variant of implicit LES for studying wave energy transport | |||||||
言語 | ||||||||
言語 | eng | |||||||
資源タイプ | ||||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_db06 | |||||||
資源タイプ | doctoral thesis | |||||||
ID登録 | ||||||||
ID登録 | 10.15102/1394.00000641 | |||||||
ID登録タイプ | JaLC | |||||||
アクセス権 | ||||||||
アクセス権 | open access | |||||||
アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||||
著者 |
チョラ, カラレ
× チョラ, カラレ
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著者 (英) |
Chola, Kalale
× Chola, Kalale
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抄録 | ||||||||
内容記述タイプ | Other | |||||||
内容記述 | The smoothed particle hydrodynamics (SPH) method is an efficient numerical technique for simulating complex problems such as free flows. Since such flows are characterized by high Reynolds number, turbulence modeling is a necessity. In the literature, some models from Eulerian based numerical schemes have been adopted but comprehensive analyses of their effectiveness have not been provided. In this thesis, a version of SPH that implicitly models turbulence has been developed. First, using a convolution filter, a filtering integral transform (FIT) is proposed and applied to the underlying, disordered field fρ; p; ρug to construct a smooth field fhρhi; hphi; hρhiuehg. Using the FIT, filtered equations consistent with explicit Large Eddy Simulation (LES) are derived. Second, using a deconvolution filter, a de-filtering integral transform (DIT) is proposed as an inverse transform to the FIT. By applying the DIT to the filtered equations a high order version of SPH, to be called SPH-i is formulated. In SPH-i, unlike SPH, the disordered field is evolved dynamically. Third, unlike standard SPH two inverse filters are required; a convolution filter and a deconvolution filter. A rigorous method for constructing these filters in 2D is presented. Fourth, to address the problem of numerical oscillations in the pressure field, common in standard SPH, has been addressed by introducing a differential equation for the pressure field that includes smoothing terms. The proposed SPH-i model was applied to a number of free surface flow problems and the results are promising. |
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口頭試問日 | ||||||||
2018-07-11 | ||||||||
学位授与年月日 | ||||||||
学位授与年月日 | 2018-08-31 | |||||||
学位名 | ||||||||
学位名 | Doctor of Philosophy | |||||||
学位授与番号 | ||||||||
学位授与番号 | 甲第19号 | |||||||
学位授与機関 | ||||||||
学位授与機関識別子Scheme | kakenhi | |||||||
学位授与機関識別子 | 38005 | |||||||
学位授与機関名 | Okinawa Institute of Science and Technology Graduate University | |||||||
著者版フラグ | ||||||||
出版タイプ | VoR | |||||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||||
権利 | ||||||||
権利情報 | © 2018 The Author |