### Abstract

In this paper we consider the application of high-order, high-bandwidth numerical schemes to problems in aeroa-coustics. In particular we consider the effect of choice of grid geometry on the solutions. In the first section of the paper, examples of the effect of non-uniform grids on the solution for the propagation of an initially Gaussian and a cylindrical acoustic source are presented. Dispersion-Relation-Preseverving algorithms are used with modifications for the grid non-uniformity. In the second part of the paper we consider acoustic scattering of a periodic source by a finite plate and a circular cylinder. Two types of boundary treatment for the solid surface are described. The first is a traditional solid wall boundary condition. The second treatment replaces the solid object with a region of high acoustic impedance. Comparisions are made between the different approaches and their advantages and disadvantages are discussed. Finally, some preliminary results for the acoustic scattering of a Gaussian pulse by a circular cylinder are described. Two different approaches are used. One uses a uniform Cartesian grid the other uses a body-fitted coordinate system. The latter approach is implemented on a massively parallel computer.

Original language | English (US) |
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State | Published - Jan 1 1994 |

Event | AIAA Fluid Dynamics Conference, 1994 - Colorado Springs, United States Duration: Jun 20 1994 → Jun 23 1994 |

### Other

Other | AIAA Fluid Dynamics Conference, 1994 |
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Country | United States |

City | Colorado Springs |

Period | 6/20/94 → 6/23/94 |

### Fingerprint

### All Science Journal Classification (ASJC) codes

- Aerospace Engineering
- Engineering (miscellaneous)

### Cite this

*Computational aeroacoustics algorithms: Non-uniform grids*. Paper presented at AIAA Fluid Dynamics Conference, 1994, Colorado Springs, United States.

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**Computational aeroacoustics algorithms : Non-uniform grids.** / Morris, Philip John; Chung, Cathy; Chyczewski, Thomas S.; Long, Lyle Norman.

Research output: Contribution to conference › Paper

TY - CONF

T1 - Computational aeroacoustics algorithms

T2 - Non-uniform grids

AU - Morris, Philip John

AU - Chung, Cathy

AU - Chyczewski, Thomas S.

AU - Long, Lyle Norman

PY - 1994/1/1

Y1 - 1994/1/1

N2 - In this paper we consider the application of high-order, high-bandwidth numerical schemes to problems in aeroa-coustics. In particular we consider the effect of choice of grid geometry on the solutions. In the first section of the paper, examples of the effect of non-uniform grids on the solution for the propagation of an initially Gaussian and a cylindrical acoustic source are presented. Dispersion-Relation-Preseverving algorithms are used with modifications for the grid non-uniformity. In the second part of the paper we consider acoustic scattering of a periodic source by a finite plate and a circular cylinder. Two types of boundary treatment for the solid surface are described. The first is a traditional solid wall boundary condition. The second treatment replaces the solid object with a region of high acoustic impedance. Comparisions are made between the different approaches and their advantages and disadvantages are discussed. Finally, some preliminary results for the acoustic scattering of a Gaussian pulse by a circular cylinder are described. Two different approaches are used. One uses a uniform Cartesian grid the other uses a body-fitted coordinate system. The latter approach is implemented on a massively parallel computer.

AB - In this paper we consider the application of high-order, high-bandwidth numerical schemes to problems in aeroa-coustics. In particular we consider the effect of choice of grid geometry on the solutions. In the first section of the paper, examples of the effect of non-uniform grids on the solution for the propagation of an initially Gaussian and a cylindrical acoustic source are presented. Dispersion-Relation-Preseverving algorithms are used with modifications for the grid non-uniformity. In the second part of the paper we consider acoustic scattering of a periodic source by a finite plate and a circular cylinder. Two types of boundary treatment for the solid surface are described. The first is a traditional solid wall boundary condition. The second treatment replaces the solid object with a region of high acoustic impedance. Comparisions are made between the different approaches and their advantages and disadvantages are discussed. Finally, some preliminary results for the acoustic scattering of a Gaussian pulse by a circular cylinder are described. Two different approaches are used. One uses a uniform Cartesian grid the other uses a body-fitted coordinate system. The latter approach is implemented on a massively parallel computer.

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M3 - Paper

AN - SCOPUS:84997783107

ER -