Generation of acoustic waves in the hypersonic boundary layer over a wavy wall

Zhu, Wenkai; Gu, Dejian; Zhu, Yiding; Lee, CunBiao

doi:10.1007/s11433-021-1808-9

Cited by 6 publications

(3 citation statements)

References 37 publications

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“…4,5 With the development of computational fluid dynamics (CFD), researchers have introduced CFD technology to simulate acoustic propagation. [6][7][8][9][10][11] Currently, direct numerical simulation (DNS) is a common method for simulating acoustic propagation, and the macroscopic flow field including the acoustic disturbance can be obtained through the discrete solution of the Navier-Stokes equations. [8][9][10][11] Another simulation method is to solve the acoustic propagation equations in the form of perturbation.…”

Section: Introductionmentioning

confidence: 99%

“…[6][7][8][9][10][11] Currently, direct numerical simulation (DNS) is a common method for simulating acoustic propagation, and the macroscopic flow field including the acoustic disturbance can be obtained through the discrete solution of the Navier-Stokes equations. [8][9][10][11] Another simulation method is to solve the acoustic propagation equations in the form of perturbation. The physical variables are divided into mean flow and acoustic disturbance, and the nonlinear terms and viscous terms are ignored to obtain the perturbed acoustic propagation equations, such as linearized Euler equations, 12 acoustic perturbation equations 13 and so on.…”

Section: Introductionmentioning

confidence: 99%

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Acoustic multipole source–simplified lattice Boltzmann method for simulating acoustic propagation problems

Chen

Cao

Liu

et al. 2023

Numerical Methods in Fluids

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Combining the advantages of the acoustic multipole source (AMS) method and the simplified lattice Boltzmann method (SLBM), a method called AMS-SLBM is proposed for simulating the propagation of acoustic multipole sources in fluids. A particle source term is introduced to the right-hand side of the lattice Boltzmann equation using the AMS method, and the macroscopic equations with source terms are derived via the Chapman-Enskog expansion analysis. Employing the fractional step technique, the solving process of the macroscopic equations can be divided into three steps: the predictor, corrector, and supplement steps. In the predictor and corrector steps, macroscopic equations without source terms are solved by SLBM, and in the supplement step, the time advancement of the source terms is solved using the finite difference method.AMS-SLBM uses SLBM to simulate the propagation of sound waves by directly evolving the macroscopic variables, which evades the evolution and storage of the distribution function, and the computational process is simpler and memory can be reduced compared to the standard LBM. Moreover, since the acoustic source term is introduced to the right-hand side of the lattice Boltzmann equation by the AMS method, AMS-SLBM avoids the disadvantage that the traditional forced equilibrium distribution function method will interfere and cover the original flow field during the calculations. Several cases including the propagation of a plane wave, a Gaussian pulse and acoustic monopole, dipole, and quadrupole sources are simulated to validate the robustness and accuracy of the present method. The results show that AMS-SLBM can well simulate acoustic multipole sources propagation, and it affords second-order accuracy.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Acoustic multipole source–simplified lattice Boltzmann method for simulating acoustic propagation problems

Chen

Cao

Liu

et al. 2023

Numerical Methods in Fluids

View full text Add to dashboard Cite

show abstract

“…Refs. [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26]) can account for the muon anomaly while still being allowed by the relevant constraints. A simple extension for the anomaly is a light leptophilic scalar φ L with enhanced coupling to leptons, and a promising search mode was suggested to be e + e − → τ + τ − φ L followed by φ L → l l (l = e, μ) [27] at high-luminosity electron-positron colliders.…”

Section: Introductionmentioning

confidence: 99%

A dark leptophilic scalar with the updated muon $$g-2$$ anomaly

Jia

2022

Eur. Phys. J. C

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The muon $$g-2$$ g - 2 anomaly was strengthened by recent experimental results at Fermilab, which may be signatures of new physics. A scenario of leptophilic scalar $$\phi _L$$ ϕ L accounting for the muon $$g-2$$ g - 2 anomaly is investigated in this paper. Although a light $$\phi _L$$ ϕ L mainly decaying into standard model (SM) particles has been excluded by experiments, a dark leptophilic scalar $$\phi _L$$ ϕ L predominantly decaying into invisible fermionic dark matter (DM) $$\chi {\bar{\chi }}$$ χ χ ¯ is still allowed. Considering the decay mode $$\phi _L \rightarrow \chi {\bar{\chi }}$$ ϕ L → χ χ ¯ opened (here $$m_{\phi _L} = 3 m_\chi $$ m ϕ L = 3 m χ ), the coupling preferred by the muon $$g-2$$ g - 2 and the $$\phi _L-\chi $$ ϕ L - χ coupling are derived. The light/heavy $$\phi _L$$ ϕ L (roughly 1 GeV as a benchmark value) can be tested by future experiments via DM/SM decay modes, and the contribution of $$\phi _L$$ ϕ L to the anomalous magnetic moment of the tau lepton could be investigated at lepton colliders. The search for $$\chi $$ χ via $$\chi $$ χ -electron scattering in direct detection of DM is not sensitive due to a tiny $$\phi _L$$ ϕ L -electron coupling, especially for $$m_\chi > rsim m_\mu $$ m χ ≳ m μ .

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Effects of steps on the hypersonic boundary layer transition over a cone at 10° angle-of-attack

Han

et al. 2022

Physics of Fluids

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In a previous research on the hypersonic boundary layer transition over a sharp cone at 0° angle-of-attack ( AoA), we concluded the different effects of the forward-facing step (FFS) and the backward-facing step (BFS) on the transition [Xu et al., AIAA J. 59, 439–446 (2021)]. This further study intends to examine if the conclusion still maintains after changing the nose bluntness and the angle-of-attack of the cone. Experiments are conducted in a Mach 6 wind tunnel using nano-tracer-based planar laser scattering techniques, temperature sensitive paints, and high-frequency pressure sensors. The results show that although the FFS delays the boundary layer transition while the BFS promotes the transition at AoA = 0° and at AoA = 10°, a completely different pattern is observed; the FFS significantly promotes the transition, while the effect of the BFS appears only weakly to advocate the transition. Noteworthy, the nose bluntness will not change the effects of the BFS/FFS on the transition.

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Generation of acoustic waves in the hypersonic boundary layer over a wavy wall

Cited by 6 publications

References 37 publications

Acoustic multipole source–simplified lattice Boltzmann method for simulating acoustic propagation problems

Acoustic multipole source–simplified lattice Boltzmann method for simulating acoustic propagation problems

A dark leptophilic scalar with the updated muon $$g-2$$ anomaly

Effects of steps on the hypersonic boundary layer transition over a cone at 10° angle-of-attack

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