Influence of source term interpolation on hybrid computational aeroacoustics in finite volumes

Publikationstyp
Conference Paper
Date Issued
2016-08-21
Sprache
English
Author(s)
Schröder, Thorben  
Silkeit, Patrick  
Estorff, Otto von  
Institut
Modellierung und Berechnung M-16  
TORE-URI
http://hdl.handle.net/11420/5654
Start Page
1598
End Page
1608
Citation
International Congress and Exposition on Noise Control Engineering: Towards a Quieter Future, INTER-NOISE: 1598-1608 (2016-08-21)
Contribution to Conference
INTER-NOISE, International Congress and Exposition on Noise Control Engineering 2016  
Due to differences in length- and energy scales, it is common in hybrid computational aeroacoustics (CAA) to use different meshes for the computational fluid dynamics (CFD) and the acoustic calculations. Therefore, an interpolation is needed to map field quantities from the CFD mesh to the acoustic mesh. The computational effort for the interpolation and the resulting accuracy, however, vary for different methods. This contribution discusses the source term interpolation for the case that the CFD and the acoustic computation are both performed in finite volumes (FV). The CAA code is developed based on the OpenFOAM® framework. The focus is placed on CAA methods which use the first time derivative of the incompressible flow pressure as their acoustic source term. The present work compares different methods of interpolation which are especially well suited for FV simulations. Two fundamentally different sample cases are used to evaluate the influence of the interpolation strategy on the result accuracy and the numerical behavior of the simulation. Furthermore, mesh influences are studied and computation times are compared.
Subjects
Finite volume method
Hybrid computational aeroacoustics
Source term interpolation