FLUID–STRUCTURE COUPLING SIMULATION OF EXPLOSIVE FLOW FIELD IN HETEROGENEOUS POROUS MEDIA BASED ON FRACTAL THEORY

Qingyong Zhu, Shun Lu, Dongheng Lai and Junjun Sun
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Qingyong Zhu: School of Aeronautics and Astronautics, Sun Yat-sen University, Shenzhen, Guangdong 518107, P. R. China
Shun Lu: School of Aeronautics and Astronautics, Sun Yat-sen University, Shenzhen, Guangdong 518107, P. R. China
Dongheng Lai: School of Aeronautics and Astronautics, Sun Yat-sen University, Shenzhen, Guangdong 518107, P. R. China
Junjun Sun: School of Aeronautics and Astronautics, Sun Yat-sen University, Shenzhen, Guangdong 518107, P. R. China

FRACTALS (fractals), 2022, vol. 30, issue 03, 1-17

Abstract: In this paper, through finite difference and finite element coupling algorithms with structured grid, the fluid–structure coupling problems of the pressure of the fluid as well as stress and strain of the heterogeneous porous medium under the initial pressure of MPa magnitude are calculated, respectively. The porous medium is a cavity cylinder with fractal characteristics. The parameters of porosity, elastic modulus and Poisson’s ratio of porous media with different fractal dimensions (D = 2.3, 2.4 and 2.5) are obtained by theoretical calculation. Through theoretical derivation, the amplitude of WM function is expressed by the fractal parameter porosity, which can predict the uneven characteristics caused by the nonuniformity of pore size distribution after explosion. The results show that with the increase of fractal dimensions, the porosity increases, and both the elastic modulus and the Poisson’s ratio decrease. The Poisson’s ratio has a linear relationship with porosity, which is well consistent with the modified formula in the literature. Under the same initial pressure, the stress and strain values of the material without fractal characteristics are much larger than those of the material with fractal feature which has an obvious fluctuation by extracting the average values. It indicates that the fractal porous media with rough surface can effectively reduce the pressure wave peak at the wall surface, and reduce the size of the stress and strain concentrations to prevent the vibration of the cylinder. As expected, if the initial pressure increases with an equal fractal dimension, the stress and strain values of the fluid–structure coupling will increase too. When the initial pressure is equal, the peak value of pressure in wall decreases gradually with the increase of fractal dimension, and the stress and strain values also decrease.

Keywords: Fractal Dimension; Fluid–Structure Coupling; Elastic Modulus; Porosity (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1142/S0218348X22500487

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