S V Fortova (Institute for Computer Aided Design of the Russian Academy of Sciences) :
Articles:
519.63 Modification of aluminum by laser shock wave detected in atomistic modeling
Perov E. A. (JIHT), Zhakhovsky V. V. (Dukhov Automatics Research Institute/JIHT), Алимович N. A. (L.D. Landau Institute for Theoretical Physics RAS), Shepelev V. V. (Institute for Computer Aided Design of the Russian Academy of Sciences), Fortova S. V. (Institute for Computer Aided Design of the Russian Academy of Sciences), Doludenko A. N. (JIHT)
doi: 10.18698/2309-3684-2023-4-7492
Plastic deformations are the basis of such industrial technology as laser thermal hardening or laser pinning (LSP, laser shock peening). In this paper, the possibility of hardening the surface layer of an aluminum sample irradiated by a single femtosecond laser pulse is investigated by the method of classical molecular dynamics. Several initialstates of the film are simulated; three orientations of the crystal lattice are investigated — [1, 0, 0] (the first orientation of the crystal lattice), [1, 1, 0] (the second orientation of the crystal lattice), [1, 1, 1] (the third orientation of the crystal lattice). A numerical study of the effect of various values of the invested energy in the range from 120,98 J/m2 to 2540,01 J/m2 of a laser pulse on the depth of plastic deformations affecting the hardening of the material under study was carried out. The energy values were selected in such a way that the plastic front of the UV (shock wave) stopped before it reached the right boundary of the simulated film. If this condition is not observed, then the dependence cannot be considered correctly constructed, since the stretching wave reflected from the right boundary of the sample will slow down the plastic shock front, acting as an unloading wave. With the help of this dependence, the threshold value of the invested energy is determined, when exceeded, aluminum begins to deform plastically.
Перов E.А., Жаховский В.В., Иногамов Н.А., Шепелев В.В., Фортова С.В., Долуденко А.Н.. Молекулярно-динамическое моделирование модификации алюминия лазерной ударной волной. Математическое моделирование и численные методы, 2023, № 4, с. 74-92
519.63 Numerical modelling of shock wave processes induced by femtosecond laser pulses
Bulanov A. V. (Institute for Computer Aided Design of the Russian Academy of Sciences), Shepelev V. V. (Institute for Computer Aided Design of the Russian Academy of Sciences), Fortova S. V. (Institute for Computer Aided Design of the Russian Academy of Sciences)
doi: 10.18698/2309-3684-2024-4-6677
In this paper, the problem of irradiating an aluminum target with a femtosecond laser pulse is investigated. The calculation of the problem is carried out using the finite element Lagrangian method. The results are compared with calculations by the Godunov type method and the molecular dynamics method. Hydrodynamic calculations show almost complete compliance. Using the method with movable mesh allows you to accurately determine the boundary of the material. In the field of rarefaction waves, hydrodynamic methods show a much larger amplitude of negative pressures than calculations done with molecular dynamics method. A separation model is proposed, which takes into account possible ruptures of the material. The use of the separation model in calculations improves compliance with molecular dynamics models and prevents the formation of a second shock wave.
Буланов А.В., Шепелев В.В. Фортова С.В. Численное моделирование распространения индуцированной лазером ударной волны в алюминии. Математическое моделирование и численные методы, 2024, № 4, с. 66–77.
533.6.011.6 Numerical simulation of supersonic flow around a parachute with a head body
Fortova S. V. (Institute for Computer Aided Design of the Russian Academy of Sciences), Ermakov A. D. (Institute for Computer Aided Design of the Russian Academy of Sciences)
doi: 10.18698/2309-3684-2024-4-7892
Many atmospheric and oceanic phenomena demonstrate the features of quasi-two-dimensional turbulence that occurs in the presence of rotational force. The study of vortex formation processes in such systems is conditioned by the need to develop qualitative forecasting of the occurrence of cyclones and anticyclones. These weather phenomena are geostrophic flows that can be described within the framework of quasi-two-dimensional turbulence. In this paper, based on numerical modeling of the Navier-Stokes system of equations, the problem of forming coherent vertical structures in a cubic cell in the presence of rotation (Coriolis force) and a constantly acting external force (pumping) is investigated. In the course of numerical experiments, depending on the values of the rotational force and the pumping force, several types of flows were obtained — a chaotic mode, the mode of occurrence of several cyclone vortices and the mode of occurrence of one large cyclone with an anticyclone inside a cyclonic region (“cyclone-anticyclone”).
Фортова С.В., Ермаков А.Д. Численное моделирование квази-двумерных турбулентных течений в замкнутой кубической ячейке. Математическое моделирование и численные методы, 2024, № 4, с. 78–92.