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Numerical boundary conditions for unsteady transonic flow calculations

✍ Scribed by Hong Jiang; B. H. K. Lee; Yau Shu Wong

Publisher
John Wiley and Sons
Year
1994
Tongue
English
Weight
585 KB
Volume
18
Category
Article
ISSN
0271-2091

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✦ Synopsis

In calculations of transonic flows it is necessary to limit the domain of computation to a size that is manageable by computers. At the boundary of the computational domain, boundary conditions are required to ensure a unique solution. Since wave solutions exist in the unsteady transonic flow field, incorrect boundary conditions may result in spurious reflections from the computational boundary. This may introduce errors into the solution. To prevent the spurious reflections, absorbing boundary conditions are often used on the computational boundary. In this paper we describe a method to derive absorbing boundary conditions for transonic calculations. We demonstrate both theoretically and numerically that the use of the absorbing boundary conditions will reduce the spurious reflections in the calculation.

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