Ayşe Sibel YALAZ ECE, Sertaç ÇADIRCI
In this study, three-dimensional model fighter aircraft geometry was analyzed with Computational Fluid Dynamics (CFD) at different angles of attack, and the obtained longitudinal aerodynamic force coefficients were validated with wind tunnel data. A mesh-independence study was carried out on the model and three meshes with different standardized element sizes were created. Analyzes were performed on a mesh containing a sufficient number of elements with three different turbulence models and at different time steps using ANSYS software. Turbulent transport equations with conservation of mass, momentum and energy were solved until the convergence criterion of 10-6 were satisfied. The flow is assumed to be at sea level, 0.2 Ma and compressible. Reynolds Stress Model (RSM), which is the turbulence model aligning with the test data, was chosen to predict the aerodynamic effects at high angles of attack. In addition to the study, the front wing strake, which is frequently used in fighter aircrafts, was integrated into the wind tunnel geometry and the aerodynamic effects on the wing were examined. Validated CFD analyzes provide the basis for examining the effects of front wing strake structures on fighter aircraft longitudinal and lateral stability and are intended to fill an important gap in the literature. The changes in the wing and tail control surface efficiencies caused by the strakes, which allow to significantly increase the wing lift at high angles of attack, will be investigated in future studies. ORCID NO: 0000-0003-4386-7571

Anahtar Kelimeler: CFD, Turbulence models, Strake, Fighter Aircraft