IMPROVEMENT OF GAL MODEL FOR CONVECTIVE NUMERICAL SIMULATION

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  • Nihei Yasuo
    社団法人 土木学会 東京工業大学 大学院情報理工学研究科情報環境学専攻
  • Nadaoka Kazuo
    社団法人 土木学会 東京工業大学 大学院情報理工学研究科情報環境学専攻

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  • 移流シミュレーションに対するGALモデルの高精度化とその適用性
  • イリュウ シミュレーション ニ タイスル GAL モデル ノ コウ セイドカ

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Abstract

The accuracy of GAL model, recently developed by the authors for a new formulation of dispersed-phase motion in a multiphase turbulent flow, is examined for numerical simulation of convective transport. To reduce numerical diffusion inherent in the previous scheme of reallocation procedure of the GAL model, a new reallocation scheme is presented. The performance of the GAL model with the new scheme is confirmed through numerical simulation for simple cases of convective transport and comparison with the computational results obtained by 1st-order upwind scheme, QUICKEST method and 6-point scheme. Among these the GAL model with the improved reallocation procedure is found to have relatively higher accuracy, being comparable to 6-point scheme. More importantly the improved GAL model has high numerical stability even for the flow condition of Courant number greater than one, and can precisely simulate evolution of a distribution with a sharp front.

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