Simplified permeable surface correction for frequency-domain Ffowcs Williams and Hawkings integrals

• 作者: Zhiteng Zhou Hongping Wang Shizhao Wang
• 来源期刊: 力学快报（英文版）
• 年，卷（期）: 2021,（4）
• 所属期刊栏目: Fluid Mechanics
• 页码范围: 192-196
• 页数: 5页
• 语种: 英文
• DOI: 10.3969/j.issn.2095-0349.2021.04.002

摘要

A simplified surface correction formulation is proposed to diminish the far-field spurious sound gener- ated by the quadrupole source term in Ffowcs Williams and Hawkings (FW-H) integrals. The proposed formulation utilizes the far-field asymptotics of the Green's function to simplify the computation of its high-order derivatives, which circumvents the difficulties reported in the original frequency-domain sur- face correction formulation. The proposed formulation has been validated by investigating the benchmark case of sound generated by a convecting vortex. The results show that the proposed formulation success- fully eliminates the spurious sound. The applications of the proposed formulation to flows with some special parameters are also discussed.