NUMERICAL INVESTIGATION OF ROD-AIRFOIL CONFIGURATION AEROACOUSTIC CHARACTERISTICS USING FFOWCS-WILLIAMS-HAWKINGS EQUATIONS

Ece AYLİ; Eyüp KOÇAK; Haşmet TÜRKOĞLU

doi:https://doi.org/10.18186/thermal.867981

Article Details

NUMERICAL INVESTIGATION OF ROD-AIRFOIL CONFIGURATION AEROACOUSTIC CHARACTERISTICS USING FFOWCS-WILLIAMS-HAWKINGS EQUATIONS

Authors:

Ece AYLİ | Eyüp KOÇAK | Haşmet TÜRKOĞLU

Publisher:

Yildiz Technical University

Main Topics:

Applied physics

Journal:

Journal of Thermal Engineering 2021 Vol.7 Issue 2, pp.58-70

Document Type:

Article

Publication Date:

1/2021

Document Language:

English

Document ID (Org No.):

2000505313

Frequency:

Bimonthly

eISSN:

2148-7847

DOI:

https://doi.org/10.18186/thermal.867981

Abstract:

 

The rod-airfoil configuration is a fundamental study to understand sound generation processes and the acoustic phenomena in the application of turbines, fans, and airfoils. In the present research, the noise that is originated by the rod-airfoil configuration is examined using numerical methods which are Large Eddy Simulation (LES), and Reynolds Averaged Navier Stokes (RANS) models, coupled with an FFOWCS-WILLIAMS-HAWKINGS (FW-H) technique. For the RANS method, k-ω SST and Spalart Allmaras (S-A) turbulence models are utilized in order to investigate the capability of different models for the analysis of the aeroacoustic flow field. The ANSYS FLUENT solver is chosen to carry out the numerical simulations.  The examined rod and chord diameter Reynolds numbers are 48000 and 480000, respectively and the Mach number is 0.2. Results are obtained for both in the near field and acoustic far-field. The obtained numerical results are verified with an experimental study from the literature, and the results of both approaches are compared with each other and the experiment.  Comparisons are performed for mean velocity profiles in the rod and airfoil wakes, pressure spectra and power spectral density. The results obtained show that LES is preferable for this problem as it is capable of capturing the flow separation, reattachments, vortex street, and various length scales of turbulence. Although both RANS and LES methods provide a consistent flow field with experimental methods, the RANS approach overestimates the vortex shedding frequency and Strouhal number. The RANS model predicts the flow field well; however, it overestimates the noise spectra. The LES model predicts satisfactory acoustic spectra.

Article Details

NUMERICAL INVESTIGATION OF ROD-AIRFOIL CONFIGURATION AEROACOUSTIC CHARACTERISTICS USING FFOWCS-WILLIAMS-HAWKINGS EQUATIONS

Authors: Ece AYLİ | Eyüp KOÇAK | Haşmet TÜRKOĞLU

Publisher: Yildiz Technical University

Main Topics: Applied physics

Journal: Journal of Thermal Engineering 2021 Vol.7 Issue 2, pp.58-70

Document Type: Article

Publication Date: 1/2021

Document Language: English

Document ID (Org No.): 2000505313

Frequency: Bimonthly

eISSN: 2148-7847

DOI: https://doi.org/10.18186/thermal.867981

Issues

Authors:

Ece AYLİ | Eyüp KOÇAK | Haşmet TÜRKOĞLU

Publisher:

Yildiz Technical University

Main Topics:

Applied physics

Journal:

Journal of Thermal Engineering 2021 Vol.7 Issue 2, pp.58-70

Document Type:

Article

Publication Date:

1/2021

Document Language:

English

Document ID (Org No.):

2000505313

Frequency:

Bimonthly

eISSN:

2148-7847

DOI:

https://doi.org/10.18186/thermal.867981