Evaluation of Quasi-Two - Dimensional Integral Surface Sound Simulation Methood

In this research a quasi-two-dimensional integral surface method able to simulate the acoustic domains is evaluated. The Farassat integral surface model which needs three-dimensional da-ta is used, but the data are generated by coherent replication of two-dimensional data along the third dimension. To evaluate the method, a two-dimensional monopole is employed as the acoustic source and its data is replicated. It is observed that the acoustic pressure wave simu-lated by this method, converges to the results of two-dimensional monopole by the increase of replication length. Indeed, the pressure signal has on oscillatory behaviour by the increase of replication length while loses its amplitude during each cycle. The effects of acoustic source frequency, Mach number, location and distance of observer on the trend of conver-gence are investigated. Based on the results, a method to specify a suitable replication length able to simulate the pressure waves with a very good accuracy is introduced.

Keywords:

Computational Aeroacoustics , Farassat method , Integral surface method , Two-dimensional integral surface