Vorträge und Posterpräsentationen (mit Tagungsband-Eintrag):

M. De Gennaro, A. Zanon, H. Kühnelt, D. Caridi:
"Zonal LES for Axial Fan Broadband Noise Prediction, Part 2: Computational Test Case";
Vortrag: AIA-DAGA 2013, International Conference on Acoustics, Meran; 18.03.2013 - 21.03.2013; in: "AIA-DAGA 2013 Conference on Acoustics Programm and Abstracts Proceedings", Deutsche Gesellsch. f. Akustik, Berlin, (2013), ISBN: 978-3-939296-05-8; Paper-Nr. 425, 4 S.



Kurzfassung englisch:
Broadband noise prediction is a major challenge in computational
aeroacoustics for many industrial applications. A
proper aeroacoustic simulation requires the use of accurate
numerical approaches usually imposing a high computational
burden. For this reason they are not suitable to be implemented
in optimization loops, even if they constitute a valuable
support to address the performances of various designs.
In order to reduce the computational time for such kind of
simulations, strong approximations have to be introduced in
the numerical models. A validation and benchmark of the
simulation procedure with experimental data sets is an essential
step in order to rely on the numerical results.
The objective of this paper is to provide to the scientific
community a reference test-case for turbomachinery noise,
assessing the potentialities of a novel breakthrough approach
for Computational Fluid Dynamics (CFD): the zonal Large
Eddy Simulation (LES). The test-case chosen is a 5-bladed
axial fan tested in free field conditions with an outer diameter
of 350 mm and an operating point at 1400 rpm. Aerodynamic
and aeroacoustic performances have been investigated
both from the experimental as well as from the numerical
side, for different rotational speeds ranging from 1200 to
1600 rpm. Experimental results are given in the Part 1 [1] of
this work, while Part 2 focuses on the computational results.
The computational approach combines a fully resolved LES
in the acoustic generation region coupled with a RANS solution
in the outer region. The acoustic propagation is performed
applying the Ffowcs Williams-Hawkings acoustic
analogy. The numerical results are in good agreement with
measurements for aerodynamics as well as for the sound
level in a frequency range up to 10 kHz. A deep analysis of
the computational issues as mesh optimization and simulation
setup is provided. In addition the aerodynamic performance,
noise sources location and noise pattern directivity
are also given, providing a wide, reliable and complete testcase
for further studies and benchmarks. The simulations are
performed with ANSYS-Fluent, release 14.5.

Erstellt aus der Publikationsdatenbank des AIT Austrian Institute of Technology.