TRANSONİK KAVİTE AKIŞININ AÇIK KAYNAKLI HESAPLAMALI AEROAKUSTİK ANALİZİ

Öz

Bu çalışmada Mach sayısı 0.85 ve Reynolds sayısı 1.3x107 için zamana bağlı 3 boyutlu kavite akışı ve kavite boyunca anlık basınç salınımlarından kaynaklı oluşan gürültü açık kaynaklı Hesaplamalı Akışkanlar Dinamiği çözücüsü olan OpenFOAM kullanılarak incelenmiştir. Akış alanı modellemesinin gürültü oluşumuna etkisini gözlemlemek için iki farklı akış alanı modellemesi yapılmıştır. Akış alanı modelinin etkisine ek olarak duvar bölgesindeki ağ sıklığı ve ağdaki hücrelerin büyüme oranlarının aeroakustik bulgular üzerindeki etkisi incelenmiştir. Üç boyutlu akış alanının zamana bağlı incelemelerinde, Büyük Burgaç Benzetimi (LES) ve Ayrık Burgaç Benzetimi (DES) olmak üzere iki türbülans modeli kullanılmıştır. LES analizlerinde küçük girdap yapılarını çözmek için Smagorinsky ve WALE olmak üzere iki ağ-altı ölçek modeli kullanılmıştır. DES analizlerinde Spalart-Allmaras tabanlı DDES, IDDES ve SST k-ω tabanlı DES olmak üzere üç model kullanılmıştır. Transonik kavite için hesaplanan sayısal sonuçlar deneysel ve nümerik sonuçlarla hem konum hem frekans uzayında akustik sinyal verisi için karşılaştırılarak doğrulanmıştır. Analizler sonucu elde edilen konum uzayındaki Ortalama Ses Basınç Düzeyi verisi kavite gürültüsüne ait deneysel veri ile benzer davranışı gösterse de 8-10 desibellik bir sapma görülmüştür. Frekans uzayındaki Ses Basınç Düzeyi sonuçlarında ise Rossiter modları belirgin şekilde gözükmektedir ve hem deneysel hem nümerik çalışmaya yakın sonuçlar elde edilmiştir.

Anahtar Kelimeler

• Kavite Akışı
• Mühimmat Yuvası
• Aeroakustik
• Sıkıştırılabilir Akış
• Transonik Akış
• OpenFOAM

Open-Source Computational Aeroacoustics Analysis of Transonic Cavity Flow

Öz

In this study, unsteady three dimensional cavity flow and aerodynamically generated noise for Mach number 0.85 and Reynolds number 1.3x107 were investigated using OpenFOAM. In order to observe the effect of flow field modeling on noise generation, two flow field modeling were performed. In addition to the effect of the flow field model, the effect of the density of the ağ r the wall region and the growth rates of the cells on the aeroacoustics findings were investigated. Two turbulence models were used for unsteady investigations, namely the Large-Eddy Simulation (LES) and the Detached-Eddy Simulation (DES). Two subgrid-scale models, Smagorinsky and Wall-Adapting Local Eddy-Viscosity, were used to resolve small eddies in LES. Three models, namely Spalart-Allmaras based DDES, IDDES and SST k-ω based DES, were used in DES analyses. Results calculated for the cavity were verified by comparing the reference studies results with the acoustic signal data in both location and frequency space. Although the Overall Sound Pressure Level data obtained as a result of the analyzes showed similar behavior with the experimental data, a deviation of 8-10 decibels was observed. In the Sound Pressure Level results, Rossiter modes are visible and results are compatible with both experimental and numerical studies.

Anahtar Kelimeler

• Cavity flow
• Weapon Bay
• Aeroacoustics
• Compressible Flow
• Transonic Flow
• OpenFOAM

Kaynakça

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