Revisiting numerical issues of stochastic Eulerian-Lagrangian models

Keh-Chin Chang, J. C. Yang

研究成果: Chapter

5 引文 (Scopus)

摘要

Three numerical issues of the stochastic Eulerian-Lagrangian models for two-phase turbulent flow computations are revisited. It is found that importance of the inlet condition of the dispersed-phase fluctuating velocity, u'(pi), on the solution of the fluctuating flow quantity of the dispersed phase, <u'(pi)2>, is appreciable for the large droplets (or particles). However, the neglect of the inlet u'(pi) condition which was made in the most stochastic Lagrangian computations does not introduce marked deviation in the determination of the mean dispersed-phase flow properties through use of the usual ensemble-averaging form. It is found that a great number of 104 computational droplets for each discrete size is needed to attain a statistically stationary solution of <u'(pi)2>. Furthermore, the choice of the ensemble-averaging form is not important with the use of 104 computational droplets for each discrete size in the stochastic Lagrangian computation.

原文English
主出版物標題Proceedings of the 1999 3rd ASME/JSME Joint Fluids Engineering Conference, FEDSM'99, San Francisco, California, USA, 18-23 July 1999 (CD-ROM)
發行者American Society of Mechanical Engineers
頁數1
ISBN(列印)0791819612
出版狀態Published - 1999

指紋

droplet
Phase velocity
two phase flow
turbulent flow
Turbulent flow
particle

All Science Journal Classification (ASJC) codes

  • Earth and Planetary Sciences(all)
  • Engineering(all)
  • Environmental Science(all)

引用此文

Chang, K-C., & Yang, J. C. (1999). Revisiting numerical issues of stochastic Eulerian-Lagrangian models. 於 Proceedings of the 1999 3rd ASME/JSME Joint Fluids Engineering Conference, FEDSM'99, San Francisco, California, USA, 18-23 July 1999 (CD-ROM) American Society of Mechanical Engineers.
Chang, Keh-Chin ; Yang, J. C. / Revisiting numerical issues of stochastic Eulerian-Lagrangian models. Proceedings of the 1999 3rd ASME/JSME Joint Fluids Engineering Conference, FEDSM'99, San Francisco, California, USA, 18-23 July 1999 (CD-ROM). American Society of Mechanical Engineers, 1999.
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Chang, K-C & Yang, JC 1999, Revisiting numerical issues of stochastic Eulerian-Lagrangian models. 於 Proceedings of the 1999 3rd ASME/JSME Joint Fluids Engineering Conference, FEDSM'99, San Francisco, California, USA, 18-23 July 1999 (CD-ROM). American Society of Mechanical Engineers.

Revisiting numerical issues of stochastic Eulerian-Lagrangian models. / Chang, Keh-Chin; Yang, J. C.

Proceedings of the 1999 3rd ASME/JSME Joint Fluids Engineering Conference, FEDSM'99, San Francisco, California, USA, 18-23 July 1999 (CD-ROM). American Society of Mechanical Engineers, 1999.

研究成果: Chapter

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AB - Three numerical issues of the stochastic Eulerian-Lagrangian models for two-phase turbulent flow computations are revisited. It is found that importance of the inlet condition of the dispersed-phase fluctuating velocity, u'(pi), on the solution of the fluctuating flow quantity of the dispersed phase, 2>, is appreciable for the large droplets (or particles). However, the neglect of the inlet u'(pi) condition which was made in the most stochastic Lagrangian computations does not introduce marked deviation in the determination of the mean dispersed-phase flow properties through use of the usual ensemble-averaging form. It is found that a great number of 104 computational droplets for each discrete size is needed to attain a statistically stationary solution of 2>. Furthermore, the choice of the ensemble-averaging form is not important with the use of 104 computational droplets for each discrete size in the stochastic Lagrangian computation.

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Chang K-C, Yang JC. Revisiting numerical issues of stochastic Eulerian-Lagrangian models. 於 Proceedings of the 1999 3rd ASME/JSME Joint Fluids Engineering Conference, FEDSM'99, San Francisco, California, USA, 18-23 July 1999 (CD-ROM). American Society of Mechanical Engineers. 1999