发表机构
Lakehead University（湖首大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文开发了一种全并行双网格浸入边界框架，耦合不可压缩纳维-斯托克斯求解器与APE求解器，可高效预测复杂运动变形物体的流致声，经多案例验证且适用于真实三维生物运动场景。
AI 中文摘要
预测运动和变形物体产生的流致声计算成本极高，因为近场流体动力学与远场声学需要截然不同的空间分辨率和计算域范围。为解决该差异，本文开发了一种全并行混合框架，通过在独立生成的非匹配笛卡尔网格上耦合不可压缩纳维-斯托克斯求解器与声扰动方程（APE）求解器实现。该框架采用带径向基函数重构的锐界面虚拟单元浸入边界方法，在两套网格上为复杂运动几何体施加边界条件。收敛的流场通过单向预计算的并行插值算子为声场提供声源。该设置将流场网格限制在物体和尾流区域，同时允许声学网格独立扩展至远场。本文通过高斯脉冲传播、刚性圆柱对脉冲的散射、圆柱绕流产生的音调声，以及行波状箔片的辐射这四个案例对框架进行验证，预测的波形、波长、声压幅值及辐射模式与解析解和已发表参考数据高度吻合。将该框架应用于鳗鱼和杰克鱼的运动、四条鳗鱼组成的鱼群、蝠鲼以及港海豹的场景，进一步证明其可处理真实三维形态、大边界变形及多个相互作用的游动生物，所得结果可解析出依赖形态的声学特征以及由干涉导致的远场指向性变化，且无需流场网格覆盖声学远场。
英文摘要
Predicting flow-induced sound from moving and deforming bodies is computationally demanding because the near-field hydrodynamics and the far-field acoustics require substantially different spatial resolutions and domain extents. A fully parallel hybrid framework is developed to address this disparity by coupling an incompressible Navier-Stokes solver to an acoustic perturbation equation (APE) solver on independently generated, non-conforming Cartesian grids. A sharp-interface ghost-cell immersed boundary method, with radial-basis-function reconstruction, imposes the boundary conditions for complex moving geometries on both grids. The converged flow field supplies the acoustic source through a one-way, precomputed parallel interpolation operator. This arrangement confines the flow grid to the body and wake while allowing the acoustic grid to extend independently into the far field. The framework is validated for Gaussian-pulse propagation, pulse scattering by a rigid cylinder, tonal sound from flow past a cylinder, and radiation from a traveling wavy foil. The predicted waveforms, wavelengths, pressure amplitudes, and radiation patterns agree closely with analytical solutions and published reference data. Applications to eel and Jack fish locomotion, a four-eel school, a manta ray, and a harbor seal further demonstrate the treatment of realistic three-dimensional morphologies, large boundary deformation, and multiple interacting swimmers. The results resolve morphology-dependent acoustic signatures and interference-driven changes in far-field directivity without requiring the flow grid to span the acoustic far field.
