A FSI Enabled Practical Rotorcraft Flow Simulator for Morphing Blade Innovation

Abstract : We have developed a fluid-structure interaction (FSI) enabled solver by coupling the Gradient smooth method (GSM) CFD solver and CSD solvers. The research includes three parts: 1) development and improvement of the GSM-CFD solver; 2) development of the FSI coupling code; 3) investigation of transonic shock/boundary-layer flows with a morphing blade. 1) For the GSM-CFD solver, a new matrix-based algorithm and its corresponding data structure have been devised to improve the computational efficiency and compactness of GSM. A new integration scheme has been proposed to improve the accuracy of GSM on distorted and hybrid meshes. 2) In the effort of fluid-structure coupling, the codes for FSI pair searching and shape function interpolation have been developed for the data exchange between the fluid part and the structural part. Extensive numerical examples have been provided to show the effectiveness of the proposed methods. 3) In the cases of the transonic shock/boundary layer flow control, we have demonstrated that the morphing layer can effectively weaken the transonic shock at the advancing azimuths. The characteristic of noise could be modified with a morphing layer. During the execution of this program, five journal papers were published, one has been accepted, and two conference papers have been presented.