Aeroacoustical coupling in a ducted shallow cavity and fluid/structure effects on a steam line

Flow-induced noise simulation using detached eddy simulation and the finite element acoustic analogy method

“…We can explain this phenomenon using the excitation mode theory of the cavity, as described in the related experiment paper. 34 Furthermore, comparing Figure 7 and the results obtained in Zhang et al, 3 we can see that the peaks obtained by the DES/FEAA method are broader and less clear than the results obtained using the LES/FEAA method. The values for the frequency and SPL for both peaks corresponding to the monitor point at the bottom of the cavity are listed in Table 1.…”

“…For this article, we simulate a three-dimensional cavity model, which is similar to a valve, and which is similar to an experiment conducted by Lafon et al 34 The inlet flow speed was U 0 = 62. In the experiment, the cavity was installed in a wind tunnel whose height was 0.137 m. The width of the numerical model is 0.02 m. In the coordinate system, x points to the direction of outside flow and z points to the direction perpendicular to the bottom wall of cavity.…”

“…The experimental data 34 and the simulation results using the LES/FEAA method 3 are also given in the table in order to validate our hybrid method. The percentage error values in Table 1 indicate the percent difference relative to the experimental data.…”

Aeroacoustic power generated by multiple compact axisymmetric cavities: Effect of hydrodynamic interference on the sound production

“…However, at critical conditions, the flow through such an axisymmetric cavity-pipe system causes self-sustained oscillations that lead to high-amplitude sound generation and associated mechanical vibration. Grazing flow over axisymmetric cavities in ducted flows has been investigated for a wide range of applications such as control valves, 1 piping systems, 2 and impedance walls. 3,4 Despite the geometric simplicity of axisymmetric cavity-pipe configurations, self-sustained cavity oscillations in such systems involve several complex fluid mechanics phenomena.…”

Flow-excited resonance of trapped modes of ducted shallow cavities

“…Later, oscillation problems in combustion chambers and rocket engines (Flandro, 1986) were attributed to flow over cavities. More recently, flow over cavities has been extensively investigated because of its wide range of applications such as piping system (Lafon et al, 2003), control valves (Ziada and Bühlmann, 1989), aero-optical applications (Ahuja and Chambers, 1987), flows over car open windows or sunroofs (Kook et al, 1997), and many others.…”