Ronny Widjaja - Academia.edu (original) (raw)

Ronny Widjaja

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Papers by Ronny Widjaja

Research paper thumbnail of Modelling of solid wall boundaries in computational acoustics

This paper details an investigation into the Impedance Mismatch Method (IMM) as a means of modell... more This paper details an investigation into the Impedance Mismatch Method (IMM) as a means of modelling solid-wall boundaries for both one-and two-dimensional computational aeroacoustics (CAA) simulations. The main attraction of this method is its ability to model curved shaped bodies on a cartesian grid. Firstly, the IMM is used to model a solid wall within a one dimensional domain. In its given form the IMM is seen to allow the transmission of small acoustic waves through the solid region. A modification involving damping within the solid region is shown to be an effective improvement. The modified IMM was also used to simulate acoustic scattering off a rectangular block. The results compare well with those obtained using the Tam and Dong wall boundary technique.

Research paper thumbnail of Modelling of solid wall boundaries in computational acoustics

This paper details an investigation into the Impedance Mismatch Method (IMM) as a means of modell... more This paper details an investigation into the Impedance Mismatch Method (IMM) as a means of modelling solid-wall boundaries for both one-and two-dimensional computational aeroacoustics (CAA) simulations. The main attraction of this method is its ability to model curved shaped bodies on a cartesian grid. Firstly, the IMM is used to model a solid wall within a one dimensional domain. In its given form the IMM is seen to allow the transmission of small acoustic waves through the solid region. A modification involving damping within the solid region is shown to be an effective improvement. The modified IMM was also used to simulate acoustic scattering off a rectangular block. The results compare well with those obtained using the Tam and Dong wall boundary technique.

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