【博士論文】学術データベース

博士論文 / Development of an SPH variant of implicit LES for studying wave energy transport

著者

書誌事項

タイトル

Development of an SPH variant of implicit LES for studying wave energy transport

著者名

チョラ カラレ

学位授与大学

Okinawa Institute of Science and Technology Graduate University

取得学位

Doctor of Philosophy

学位授与番号

甲第19号

学位授与年月日

2018-08-31

注記・抄録

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.

元資料の権利情報 : © 2018 The Author

各種コード

NII論文ID(NAID)

500001081048

NII著者ID(NRID)
  • 8000001204812
DOI (JaLC)

10.15102/1394.00000641

DOI

info:doi/10.15102/1394.00000641

本文言語コード

eng

データ提供元

機関リポジトリ / NDLデジタルコレクション

DOI

博士論文 / 沖縄科学技術大学院大学 / 哲学

博士論文 / 沖縄科学技術大学院大学

博士論文 / 哲学

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