Chinese Journal of Computational Physics ›› 2021, Vol. 38 ›› Issue (6): 631-660.DOI: 10.19596/j.cnki.1001-246x.8379

• Review Article •     Next Articles

Modeling and Analysis Methods for Complex Fields Based on Phase Space

Aiguo XU1,2,3(), Jiahui SONG4,1, Feng CHEN5, Kan XIE4, Yangjun YING1   

  1. 1. Institute of Applied Physics and Computational Mathematics, Beijing 100088, China
    2. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China
    3. HEDPS, Center for Applied Physics and Technology and College of Engineering, Peking University, Beijing 100871, China
    4. School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China
    5. Shan Dong Jiaotong University, Jinan, Shandong 250357, China
  • Received:2021-04-15 Online:2021-11-25 Published:2022-04-27

Abstract:

We review two modeling and analysis methods based on phase space and their applications. The first is Minkowski functionals-based Morphological Analysis Method (Min-MAM), and the second is Discrete Boltzmann modeling and analysis Method (DBM). Both of them are developed from phase space description in statistical physics. Based on independent behavior characteristic quantities, a phase space is constructed, and the phase space and its subspaces are used to describe behavior characteristics of a system. A given point in the phase space corresponds to a set of behavior characteristics of the system. The distance d between two points is used to describe the difference of two groups of behavioral characteristics, and its reciprocal, S=1/d, is used to describe similarity of two groups of behavioral characteristics. Mean value of the distance between two points over a period of time, ${\bar d}$, is used to describe difference between two kinetic processes, and its reciprocal, Sp=1/${\bar d}$, is used to describe similarity of two kinetic processes, Historically, Min-MAM appeared earlier. Receiving its inspiration is the key step in the development of discrete Boltzmann method towards phase space description method. Min-MAM is independent of data sources, so results obtained with discrete Boltzmann simulation can be further understood on another level or perspective by using Min-MAM, in addition to its own analysis functions. In the study of complex media kinetics, these two methods, from different perspectives, provide information that can be stratified and studied quantitatively.

Key words: discrete Boltzmann method, morphological analysis method, complex fields, statistical physics, phase space

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