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Aeroacoustic source term computation based on radial basis functions.

Stefan Schoder1, Klaus Roppert1, Michael Weitz1

  • 1Institute of Mechanics and Mechatronics TU Wien Vienna Austria.

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|May 5, 2020
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Summary
This summary is machine-generated.

This study introduces a novel radial basis function interpolation method for hybrid aeroacoustics simulations. This approach enhances computational efficiency and robustly connects flow and acoustic fields.

Keywords:
compactly supported functionscomputational aeroacousticsmultivariate interpolationradial basis functions

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Area of Science:

  • Computational fluid dynamics
  • Aeroacoustics
  • Numerical methods

Background:

  • Low Mach number aeroacoustics involves disparate length scales, necessitating specialized simulation models.
  • Hybrid methodologies combine flow and acoustic simulations using different meshes.
  • Existing methods require robust and efficient mesh-to-mesh interpolation of acoustic sources.

Purpose of the Study:

  • To present a specialized radial basis function (RBF) interpolation technique for hybrid aeroacoustics simulations.
  • To improve the computational efficiency and flexibility of connecting flow and acoustic fields.
  • To develop a robust method for computing spatial derivatives and aeroacoustic source terms.

Main Methods:

  • Utilizing computationally efficient local RBF interpolation with connectivity-based neighbor search.
  • Computing spatial derivatives via a local-global approach using Gaussian kernels on local point stencils.
  • Applying RBF interpolation and derivatives for complex aeroacoustic source term computation.

Main Results:

  • Demonstrated the effectiveness of local RBF interpolation for hybrid simulations.
  • Successfully computed spatial derivatives and aeroacoustic source terms.
  • Validated the approach in a numerical experiment involving a co-rotating vortex pair.

Conclusions:

  • The proposed RBF interpolation method offers a flexible and robust solution for hybrid aeroacoustics.
  • The technique enhances computational efficiency in simulating acoustic fields from flow data.
  • This work provides essential tools for accurate and efficient aeroacoustic source term calculations.