Kraposhin

This paper shows the possibility of using the open source CFD software package OpenFOAM and developed methods for calculating unsteady vortex flow fields and acoustic fields in studying the flow around aircraft. Numerical calculations of aerodynamic characteristics of an airbrake mounted on the fuselage of an aircraft were conducted. A hybrid model of turbulence using RANS and LES approaches was defined. Curle’s acoustic analogy was used for calculation. Flow fields of the aircraft and acoustic performance were obtained. Pulsations acting on the tail fin induced by an airbrake were also analyzed. It was determined that pulsations of a lateral force on the fin of an aircraft caused by airbrake was 6 times more than pulsations in absence of the airbrake; and the sound pressure level was more than 50 dB.

The goal of this work is verification of turbulence models and acoustic analogy for flow simulation and calculation of noise for a tandem of cylinders. In the scope of this work numerical results of flow simulation around a tandem of cylinders with different turbulent models were presented. Problem definition and computing methods were also defined. The RANS equations were closed with k-e, k-ω SST, SA turbulence model. Large eddy simulation was based on one sub-grid turbulence model equation. Curle’s acoustic analogy was also used. The computational method is based on the finite method algorithm. The calculation of aerodynamic coefficients of bodies was conducted with different grids and turbulence’s models. Comparison of the obtained results with the experimental results received also by the authors was carried out. On the basis of the obtained results recommendations on calculations of 3D cases could be given.