G A Shcheglov (Bauman Moscow State Technical University) :
Articles:
Tomaev I. I., Shcheglov G. A. (Bauman Moscow State Technical University)
doi: 10.18698/2309-3684-2026-1-4965
The results of testing a new algorithm for numerical simulation of unsteady aerodynamic loading of a large object during air launch from the cargo compartment of the transport aircraft are presented. To calculate the loads, the mesh-free Lagrangian vortex loops method was used, which makes it possible to increase the accuracy of modeling the geometry features of a streamlined surface with variable geometry. In the model problems, only the interaction of the vortex wake behind the fuselage of the aircraft and the body of the object, which are considered to be absolutely rigid bodies, is considered. In the fuselage model, a conditional cargo compartment boundary is introduced in the form of an impenetrable flat face, which is crossed by the object during the launch process. The transition mode is investigated, the moment of the end of which is the complete extension of the object into the stream. The calculation of the loads was carried out taking into account the simplifying assumption about the given motion of the object. An algorithm for constructing a grid on a transformable streamlined surface is presented. An open source software stack based on the C++ language was used: ProjectChrono, OpenCascade, GMSH. Two cases with varying state of the vortex wake behind the fuselage of the carrier aircraft are considered. An analysis of the obtained results of solving model problems shows that the force factors arising from the processes of unstable vortex formation in the vortex trail of the fuselage, which tend to deploy the object in the yaw plane, significantly exceed the factors that aim to deploy the object in the pitch plane. At the same time, the influence of the developed vortex wake leads to an increase in loads in the pitch plane and a decrease in loads in the yaw plane. The efficiency of the algorithm and the agreement of the results obtained with its help with the data of previously performed calculations are shown.
Томаев И.И., Щеглов Г.А. Моделирование методом вихревых петель нестационарного аэродинамического нагружения десантируемого крупногабаритного объекта. Математическое моделирование и численные методы, 2026, № 1, с. 49–65.