Abstract
This paper studies the two-dimensional micro-scale molecular simulations of the jet flow using Lagrange discrete systems and adopting Andresen flexible constraint mechanism. At the effects of different excitation conditions and boundary conditions, the low Mach number flow field and sound field are obtained, and characteristic results are given. At the jet flow and pipe flow regions, particles velocities distribution is consistent with traditional method. There are many small groups which have a bigger velocity value, and form the disturbance sources. The stronger interaction with the tube wall produces greater sound pressure, thus random collisions method at the tube wall is effective to deal with sound propagation problem. Therefore, this paper offers preliminary and calculated basis for the molecular and macroscopic quantum aerodynamic problems.
Highlights
The traditional top-down fluid numerical simulations often focus on the discrete truncation errors, but ignore the physical conservation and numerical stability
Due to the traditional jet flow sound caused by the traditional flow has been affected a lot of attention [5], and these results usually adopt nanometer size, need the huge amount of computation, so the research literatures are rarely reported about jet at molecular dynamics levels
Considering the physical mechanisms, system pressures are directly related to the definition style, we consider the following four options about Lagrange density: the direct calculation of sound pressure is arranged as option 1, which is depended on macro parameter
Summary
The traditional top-down fluid numerical simulations often focus on the discrete truncation errors, but ignore the physical conservation and numerical stability. The microscopic discrete model can be discovered the nature of the macro phenomena profoundly, because it is bottom-up approach for understanding the macro-micro particles and fluid phenomena essentials [1]. From lattice Boltzmann method to molecular level study, the main considering objects changes into very small scale, so it would be more able to reveal acoustic mechanism. The molecular dynamics simulation study is widely used [3, 4]. This paper would introduce the high-performance computing method, and study the low Reynolds-number jet flow fields by molecular dynamics method, to provide a sound basis for the correct understanding of the micro-scale sound spread phenomenon, to explore microscopic mechanism of the jet sound
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