Efficient approach for simulating aperiodic flows due to geometry distortions

Journal article

This paper presents an efficient approach for modeling aperiodic flows in an assembly due to geometry distortions. First, a relation is established in physical space between grid displacement and flow perturbation based on linear theory. This relation is then extended to an assembly of components and projected to the Fourier space. A relation is thus constructed between grid displacement and flow perturbation in the frequency domain. Finally, the nonlinear coupling of the passage-averaged mean flow and the flow variations in the assembly is introduced. The capability of the proposed method is demonstrated on the outlet guide vanes of a gas turbine engine with harmonic geometry distortions. Good agreement between the proposed method and the whole assembly computation is observed for the predicted flow perturbations in the assembly. This paper also demonstrates that the harmonic flow perturbation due to each harmonic geometry distortion can be used as a set of basis solutions to generate flowfields related to new combinations of geometry distortions. This has the potential to significantly reduce the computational cost when onerous tasks are expected for iterative design processes of assemblies with geometry distortions.

Authors: Wang, F; Di Mare, L

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: American Institute of Aeronautics and Astronautics
• Journal: AIAA Journal
• Volume: 58
• Issue: 3
• Publication date: 2019-12-24
• Acceptance date: 2019-11-12
• DOI: 10.2514/1.J058691
• EISSN: 1533-385X
• ISSN: 0001-1452
• Language: English
• Keywords: FFR