Coupling analysis of thin cropped delta wing at transonic speed based on partitioned approach

Abstract

The oscillation of a thin cropped delta wing at transonic speed was investigated by fluid-structure interaction (FSI) analysis based on a coupling approach. The present analysis model was composed of open-source software fluid solver SU2, structure solver CalculiX, and coupling library preCICE. It was found that self-induced oscillation of the cropped delta wing with elastic deformation occurs at the transonic speed. The self-induced oscillation grew with the time elapsed, and then, the behavior reached limit-cycle oscillation (LCO). The times which reach LCO varied according to the freestream dynamic pressure. The primary frequency of the oscillation was approximately 55 Hz for all conditions considered herein. However, the eigenfrequencies of the present condition of the delta wing, which are 26.66, 89.12, 133.23, 204.60, and 312.34 Hz, etc., did not correspond to the oscillation frequency. It was indicated that the strong aerodynamic force induced the oscillation. Through the comparison with the experimental data, it was found that improvement of the present FSI analysis model, i.e., turbulence model and finer computational mesh, is required.