## Abstract

Numerical differencing schemes are subject to dispersive and dissipative errors, which in one dimension are functions of wavenumber. When these schemes are applied in two or three dimensions, the errors become functions of both wavenumber and the direction of wave propagation. In this paper spectral analysis was used to analyse the magnitude and direction in error of the group velocity of vorticity-entropy and acoustic waves in the solution of the linearised Euler equations in a twodimensional Cartesian space. The anisotropy in these errors for three schemes were studied as a function of the wavenumber, wave direction, mean flow direction and mean flow Mach number. It was found that the traditional measure of error - the ratio of the magnitudes of the numerical to real group velocities - does not accurately capture the total error for waves which are traveling in an oblique direction to the mean flow. Therefore a second measure of a scheme's error that better represents the total error in the scheme is presented. Numerical experiments were run to provide confirmation of the developed theory.

Original language | English |
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Title of host publication | Proceedings of the 18th Australasian Fluid Mechanics Conference, AFMC 2012 |

Subtitle of host publication | Launceston, Australia, 3-7 December, 2012 |

Editors | P.A. Brandner, B.W. Pearce |

Publisher | Australasian Fluid Mechanics Society |

Number of pages | 4 |

ISBN (Electronic) | 9780646583730 |

Publication status | Published - 2012 |

Event | Australasian Fluid Mechanics Conference 2012 - University of Tasmania (Newnham Campus), Launceston, Australia Duration: 3 Dec 2012 → 7 Dec 2012 Conference number: 18th http://www.18afmc.com.au/ |

### Conference

Conference | Australasian Fluid Mechanics Conference 2012 |
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Abbreviated title | AFMC 2012 |

Country | Australia |

City | Launceston |

Period | 3/12/12 → 7/12/12 |

Other | The 18th AFMC is to be the 1st of a series which will be held every 2 years by The Australasian Fluid Mechanics Society. |

Internet address |