Dr. Dmitry Strelets

Candidate of Technical Sciences, Dean of «Aircraft Engineering» faculty, Head of Research Department, Moscow Aviation Institute (National Research University)

Research Interest: Design and certification of aviation technology, mathematical  modeling, optimization of complex technical systems.

Speech Title：Modeling of vortex flight safety

Abstract:The safety of aircraft operations is determined by a combination of external, technical and human factors. Factors associated with the influence of the external environment have a significant impact on flight safety, depending on the type of aircraft, mode and stages of flight. The impact of unfavorable external conditions on the "crew-aircraft" system in some cases can lead to a critical change in the flight characteristics and stability and controllability characteristics of the aircraft, as a result of which the parameters of its movement may deviate from the specified ones and lead to an aviation accident.  Thus, critical task is to develop measures and methods to reduce the level of danger of vortex path, as well as the probability of getting into aircraft trail.
On the other hand, aircraft trail can also have a positive effect due to the increase in aerodynamic properties during formation flight. To this date, a significant number of experimental studies have been conducted that confirm the aerodynamic advantage of group flight.
Most of the work on modeling flight in aircraft trail, both in extended and close formation, is performed using a simplified physical and mathematical model (frictionless flow) or structured computational grids. Solving industrial-oriented actual problems requires performing calculations in the most complete formulation on detailed grid models. In addition, modern objects of research are characterized by complex geometric configurations, which imply the use of unstructured computational grids, which also requires the adaptation of computational algorithms for such models. Therefore, an important task in the field of CFD modeling is to create a tool that provides high-precision efficient calculation of modern objects in studies of various complexity.
As a possible answer to this request for solving the problem of influence of aircraft trail on the characteristics of the aircraft movement, the report presents a numerical modeling technique based on solving the Navier-Stokes equation system. In the proposed method, the discretization of the main equations is performed using the finite volume method on unstructured grids. The EDES resolving model based on the SST model with activation of the synthetic turbulence generator STG at the boundary of the RANS/LES areas is used to simulate turbulent processes in aircraft trail. To improve the accuracy of the numerical solution, a low-dissipative scheme for calculating JST convective flow and a hybrid method for calculating gradients are used. The method makes it possible to use the calculated parameters of aircraft trail as non-stationary external boundary conditions when simulating the flight of aircraft group, which allows a series of calculations for various combinations of them in formation.
Using this method, the results of the flow around the NACA0012 airfoil in aircraft trail are obtained. Various variants of profile placement relative to aircraft trail, including changes in the lateral and vertical intervals, are studied. Recommendations are obtained for choosing the optimal position of a streamlined object that provides the maximum increase in aerodynamic quality when interacting with the vortex structures of aircraft trail.

Bio:

Dmitry Strelets, born in 1968, graduated from MAI (1994), Candidate of Technical Sciences, Deputy Director for Design of PJSC" UAC " Sukhoi Design Bureau, Associate Professor of the Department of Design and Certification of Aviation Equipment at MAI, Head of R & D department  MAI, Dean of the Institute "Aircraft Engineering" faculty, author of more than 150 scientific papers, Area of research interests – design and certification of aviation equipment, mathematical modeling, optimization of complex technical systems. Awarded the Certificate of Honor of the Ministry of Industry and Trade for his great contribution to the development of modern aviation technology, in 2018 he was awarded the honorary title "Honorary Aircraft Manufacturer", in 2021 he was awarded the Honorary Badge of the Union of Aircraft Manufacturers of Russia, in 2024 he was awarded the certificate of honor of Moscow Mayor, in 2025 he was awarded the Honorary Worker of Education of the Russian Federation.