NUMERICAL STUDY OF AERODYNAMICS AND STRUCTURAL INTERACTION BY GUST LOAD INFLUENCE AT TANDEM SOLID WINGS USING TWO-WAY FLUID STRUCTURE INTERACTION METHOD

• Main Author: Waldo Parlindungan, David
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/70324
• Institution: Institut Teknologi Bandung

<p align="justify">This study discusses aerodynamic and structure interaction on HALE UAV wings that is currently developed at Institut Teknologi Bandung (ITB). In order to fullfil the design objective for a long flight mission, the needs of a high aerodynamic efficiency are significant. Therefore, a HALE UAV is commonly designed to have a long span with high aspect ratio wings. Despite the fact that a high aspect ratio wing is beneficial for aerodynamic performance, it has its downfall in terms of the stability of structural dynamic responses that might lead to structural failure due to divergence or flutter. In the present work, the tandem wings configuration of ITB HALE UAV is evaluated using two-way fluid-structure interaction in several conditions with various gust disturbances. High-fidelity computational fluid dynamics (CFD) analyses by means of Finite Volume Method (FVM) with Detached Eddy Simulation (DES) and turbulence model Shear Stress Transport (SST) approach are conducted. On the other hand, Finite Element Method (FEM) is applied to perform the computational structural dynamics (CSD) analyses by means of implicit method Newmark Time Integration (HHT). The effect of gust disturbances on the structural responses of the tandem wings are concerned. In addition to the response exerted by the gust, the influence of the wake generated from the front wing to the rear wing is observed. In the present works, 1-cosine discrete gust is applied with the gust amplitude up to 4 m/s. Based on the results of the numerical investigation, when the wings are excited by a small gust amplitude, the pattern of the structural response closely follows the function of the gust with respect to time. In contrast, if a higher gust amplitude is applied, the structural response has some discrepancies with the gust patterns and depicts a sharper trend toward its peak value. The phenomenon is caused by a high change of angle of attack; therefore, a larger flow separation when a higher gust exerts the wing. Nevertheless, the chance of occurance for a high gust amplitude is fairly small, could lead to a frequency less than one per flght. Therefore, in general, for a more realistic, higher gust probability, the pattern of the structural response is similar to the shape of the 1-cosine gust.