Abstract:
We find a general solution to the problem on the motion in an incompressible continuous medium occupying at any time a whole domain $D\subset R^3$ under the conditions that $D$ is an axially symmetric cylinder and the motion is described by the Euler equation together with the continuity equation for an incompressible medium and belongs to the class of planar-helical flows (according to I. S. Gromeka's terminology), in which sreamlines coincide with vortex lines. This class is constructed by the method of transformation of the geometric structure of a vector field. The solution is characterized in Theorem 2 in the end of the paper.
Citation:
V. P. Vereshchagin, Yu. N. Subbotin, N. I. Chernykh, “On the mechanics of helical flows in an ideal incompressible viscous continuous medium”, Trudy Inst. Mat. i Mekh. UrO RAN, 18, no. 4, 2012, 120–134; Proc. Steklov Inst. Math. (Suppl.), 284, suppl. 1 (2014), 159–174
G. B. Sizykh, “Axisymmetric helical flow of viscous fluid”, Russian Math. (Iz. VUZ), 63:2 (2019), 44–50
V. P. Vereschagin, Yu. N. Subbotin, N. I. Chernykh, “Odin klass reshenii uravneniya Eilera v tore s solenoidalnym polem skorostei. III”, Tr. IMM UrO RAN, 22, no. 2, 2016, 91–100
V. P. Vereshchagin, Yu. N. Subbotin, N. I. Chernykh, “A solution class of the Euler equation in a torus with solenoidal velocity field. II”, Proc. Steklov Inst. Math. (Suppl.), 296, suppl. 1 (2017), 236–242
V. P. Vereshchagin, Yu. N. Subbotin, N. I. Chernykh, “Description of a helical motion of an incompressible nonviscous fluid”, Proc. Steklov Inst. Math. (Suppl.), 288, suppl. 1 (2015), 202–210
V. P. Vereshchagin, Yu. N. Subbotin, N. I. Chernykh, “A solution class of the Euler equation in a torus with solenoidal velocity field”, Proc. Steklov Inst. Math. (Suppl.), 288, suppl. 1 (2015), 211–221
V. P. Vereshchagin, Yu. N. Subbotin, N. I. Chernykh, “Some solutions of continuum equations for an incompressible viscous fluid”, Proc. Steklov Inst. Math. (Suppl.), 287, suppl. 1 (2014), 208–223