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Reconstruction of transient acoustic field based on the improved convective time-domain equivalent source method
Zhao-Huan Wang1, Zheng-Jiang Cai1, Qiuhong Liu2,3
1College of Sciences, China Jiliang University, Hangzhou 310018, China.
The Journal of the Acoustical Society of America
|March 12, 2026
Summary
This study introduces an improved convective time-domain equivalent source method for reconstructing acoustic fields in moving media. The new approach enhances accuracy and reduces sampling points by using both pressure and velocity data.
Area of Science:
- Acoustics
- Fluid Dynamics
- Computational Mechanics
Background:
- Reconstructing acoustic fields in moving media presents significant challenges.
- Existing methods often struggle with accuracy and efficiency.
Purpose of the Study:
- To develop an improved convective time-domain equivalent source method.
- To enhance the reconstruction of transient acoustic fields in moving media.
Main Methods:
- Formulation based on discretized integral solutions of convective time-domain Ffowcs Williams-Hawkings equations.
- Utilizing monopole source terms and matching acoustic pressure and particle velocity at collocation points.
- Employing a second-order central difference scheme with Lagrange linear interpolation and removing the assumption of vanishing source strengths prior to initial time.
Main Results:
- The proposed method significantly enhances reconstruction accuracy compared to pressure-only methods.
- It reduces the number of required sampling points.
- Validated through numerical tests with steady and unsteady sources in uniform flow.
Conclusions:
- The improved convective time-domain equivalent source method is effective and robust.
- It offers a superior approach for acoustic field reconstruction in moving media.
- The method successfully captures historical contributions and improves accuracy.
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