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2013
Impact Factor

# Sergei Sokolov

Universitetskaya 1, Izhevsk, 426034 Russia
Institute of Computer Science, Udmurt State University

## Publications:

 Ryabov P. E., Sokolov S. V. Phase Topology of Two Vortices of Identical Intensities in a Bose – Einstein Condensate 2019, Vol. 15, no. 1, pp.  59-66 Abstract A completely Liouville integrable Hamiltonian system with two degrees of freedom describing the dynamics of two vortex filaments in a Bose – Einstein condensate enclosed in a cylindrical trap is considered. For the system of two vortices with identical intensities a bifurcation of three Liouville tori into one is detected. Such a bifurcation is found in the integrable case of Goryachev – Chaplygin – Sretensky in rigid body dynamics. Keywords: Vortex dynamics, Bose – Einstein condensate, completely integrable Hamiltonian systems, bifurcation diagram of momentum mapping, bifurcations of Liouville tori Citation: Ryabov P. E., Sokolov S. V.,  Phase Topology of Two Vortices of Identical Intensities in a Bose – Einstein Condensate, Rus. J. Nonlin. Dyn., 2019, Vol. 15, no. 1, pp.  59-66 DOI:10.20537/nd190106
 Sokolov S. V. Falling motion of a circular cylinder interacting dynamically with $N$ point vortices 2014, Vol. 10, No. 1, pp.  59-72 Abstract The dynamical behavior of a heavy circular cylinder and $N$ point vortices in an unbounded volume of ideal liquid is considered. The liquid is assumed to be irrotational and at rest at infinity. The circulation about the cylinder is different from zero. The governing equations are presented in Hamiltonian form. Integrals of motion are found. Allowable types of trajectories are discussed in the case $N=1$. The stability of finding equilibrium solutions is investigated and some remarkable types of partial solutions of the system are presented. Poincar´e sections of the system demonstrate chaotic behavior of dynamics, which indicates a non-integrability of the system. Keywords: point vortices, Hamiltonian systems, reduction, stability of equilibrium solutions Citation: Sokolov S. V.,  Falling motion of a circular cylinder interacting dynamically with $N$ point vortices, Rus. J. Nonlin. Dyn., 2014, Vol. 10, No. 1, pp.  59-72 DOI:10.20537/nd1401005
 Sokolov S. V., Ramodanov S. M. Falling motion of a circular cylinder interacting dynamically with a point vortex 2012, Vol. 8, No. 3, pp.  617-628 Abstract We consider a system which consists of a heavy circular cylinder and a point vortex in an unbounded volume of ideal liquid. The liquid is assumed to be irrotational and at rest at infinity. The circulation about the cylinder is different from zero. The governing equations are Hamiltonian and admit an evident integral of motion — the horizontal component of the momentum. Using the integral we reduce the order and thereby obtain a system with two degrees of freedom. Most remarkable types of partial solutions of the system are presented and stability of equilibrium solutions is investigated. Keywords: point vortices, Hamiltonian systems, reduction, stability of equilibrium solutions Citation: Sokolov S. V., Ramodanov S. M.,  Falling motion of a circular cylinder interacting dynamically with a point vortex, Rus. J. Nonlin. Dyn., 2012, Vol. 8, No. 3, pp.  617-628 DOI:10.20537/nd1203014