Progress of mesoscale modeling and investigation of combustion multiphase flow

XU Aiguo; SHAN Yiming; CHEN Feng; GAN Yanbiao; LIN Chuandong

doi:10.7527/S1000-6893.2021.25842

ACTA AERONAUTICAET ASTRONAUTICA SINICA >

2021 , Vol. 42 >Issue 12: 625842 - 625842

DOI: https://doi.org/10.7527/S1000-6893.2021.25842

Special Topic of Physical Mechanism, Modelling and Modulation on Multiphase and Reacting Flows

Progress of mesoscale modeling and investigation of combustion multiphase flow

XU Aiguo ,
SHAN Yiming ,
CHEN Feng ,
GAN Yanbiao ,
LIN Chuandong

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1. Laboratory of Computational Physics, 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. Key Laboratory of High Energy Density Physics Simulations, Ministry of Education, Center for Applied Physics and Technology, Peking University, Beijing 100871, China;
4. School of Aeronautics, Shandong Jiaotong University, Jinan 250357, China;
5. Hebei Key Laboratory of Trans-Media Aerial Underwater Vehicle, North China Institute of Aerospace Engineering, Langfang 065000, China;
6. Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China

Received date: 2021-05-19

Revised date: 2021-06-23

Online published: 2021-08-03

Supported by

National Natural Science Foundation of China (11772064, 11875001, 51806116); China Academy of Engineering Physics Foundation (CX2019033); the Opening Project of State Key Laboratory of Explosion Science and Technology of Beijing Institute of Technology (KFJJ21-16M); Natural Science Foundation of Shandong Province (ZR2020MA061); Shandong Province Higher Educational Youth Innovation Science and Technology Program (2019KJJ009).

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Abstract

Traditional computational fluid dynamics based on solving Navier-Stokes equations has achieved great success in many fields, but it has also encountered new bottlenecks and challenges in aerospace, microfluidic and other fields. The reasons can be divided into two aspects:(A) the problem of physical modeling; (B) the numerical accuracy and stability caused by discrete scheme. Reasonable and functional physical model is the premise of numerical simulation research. Problems at the level of physical modeling cannot be solved by improving numerical accuracy. A series of new concepts of combustion such as micro-scale combustion remind us that these more abundant but previously poorly understood characteristics of non-equilibrium behavior contains a large number of physical functions to be explored. In this paper we review the progress of Discrete Boltzmann Modeling method (DBM) for nonequilibrium combustion from the perspective of physical modeling and complex physical field analysis. DBM is one of the specific applications of coarse-grained modeling theory in non-equilibrium statistical physics in the field of fluid mechanics. It is a further development of phase space description method in the form of discrete Boltzmann equation. The methodology of DBM is to decompose a complex problem and select a perspective to study a set of kinetic properties of the system, so it is required that the kinetic moments describing this set of properties maintain their values in the model simplification. Based on the independent components of the kinetic moments, the phase space is constructed. The phase space and its subspaces are used to describe the non-equilibrium behavior of the system. The research perspective and modeling accuracy will be adjusted as the research progresses. With the help of DBM, kinetic processes such as the non-equilibrium and mutual conversion of internal energy in different degrees of freedom during the reaction process, which cannot be simulated by Navier-Stokes model, can be studied. In the process of internal and external explosions, the geometric convergent and divergent effects are equivalent to an "external field force", and the system is always in thermodynamic equilibrium state at the center of the sphere. At the von Neumann pressure peak, the system is not the furthest off equilibrium, but near equilibrium. The theoretical Chapmann-Jouguet values, the theoretical Zeldovich-Neumann-Doering (ZND) values and the DBM results are mutually verified outside the post-peak reaction region of von Neumann. The results of DBM in the reaction zone are consistent with those of ZND. In the compression stage before the von Neumann pressure peak, the DBM results are more physically reasonable. In the process of shock compression, compared with other degrees of freedom, the internal energy on the degree of freedom where the compression wave is located increases first, so the internal energy on this degree of freedom always deviates from its equilibrium state in the positive direction, while the internal energy on the transverse degree of freedom always deviates from its equilibrium state in the negative direction. From the perspective of the two-fluid model, the reactants and products deviate from thermodynamic equilibrium in opposite directions.

Key words： combustion; detonation; non-equilibrium; discrete effects; mesoscale modeling; kinetic theory

Cite this article

XU Aiguo , SHAN Yiming , CHEN Feng , GAN Yanbiao , LIN Chuandong . Progress of mesoscale modeling and investigation of combustion multiphase flow[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2021 , 42(12) : 625842 -625842 . DOI: 10.7527/S1000-6893.2021.25842

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