Description
Flow field and sound source modeling
A hybrid approach is used for the acoustic simulation, in which the flow field is first determined using stationary or unsteady CFD simulations. This solution contains the convective transport information of the base flow and the turbulence data from which sound sources can be modeled.
Acoustic calculation and methods
For the calculation of the acoustic field, the flow solution serves as the input variable for the CAA method. The sound transport through the acoustic domain can be calculated using methods such as the linearized Euler equations (LEE) or the acoustic perturbation equations (APE). CAA and CFD differ here primarily in the length scales of the disturbances. Depending on the area of application, different software packages can be used to calculate the CAA methods.
Areas of application and software packages
Our CAA simulations are used in a wide range of areas such as blade cascades, pipelines and engine inlets. We use specialized software for precise results, including:
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PIANO
PIANO (Perturbation Investigation of Aerodynamic Noise, DLR) is a finite-difference-based method that simulates sound generation and sound transport in an inhomogeneous flow. The calculations are carried out in the time domain, whereby both tonal and broadband noise can be calculated. PIANO is used at the TFD to calculate sound transport in blade cascades and compressor inlets, among other things.
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COMSOL Multiphysics
COMSOL is a finite element method (FEM) that is suitable for simple applications in the time or frequency domain.
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linearTRACE
linearTRACE (Turbomachinery Research Aerodynamic Computational Environment, DLR) is a finite volume method that solves turbomachinery-specific acoustic problems in the frequency range.
Contact person
30823 Garbsen
