Non-Stationary Helical Flows for Incompressible Couple Stress Fluid

Sergey V. Ershkov (), Evgeniy Yu. Prosviryakov, Mikhail A. Artemov and Dmytro D. Leshchenko
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Sergey V. Ershkov: Department of Scientific Researches, Plekhanov Russian University of Economics, Scopus Number 60030998, 36 Stremyanny Lane, 117997 Moscow, Russia
Evgeniy Yu. Prosviryakov: Institute of Engineering Science UB RAS, 620049 Ekaterinburg, Russia
Mikhail A. Artemov: Department of Applied Mathematics, Informatics and Mechanics, Voronezh State University, 394018 Voronezh, Russia
Dmytro D. Leshchenko: Odessa State Academy of Civil Engineering and Architecture, 65029 Odessa, Ukraine

Mathematics, 2023, vol. 11, issue 24, 1-15

Abstract: We explored here the case of three-dimensional non-stationary flows of helical type for the incompressible couple stress fluid with given Bernoulli -function in the whole space (the Cauchy problem). In our presentation, the case of non-stationary helical flows with constant coefficient of proportionality α between velocity and the curl field of flow is investigated. In the given analysis for this given type of couple stress fluid flows, an absolutely novel class of exact solutions in theoretical hydrodynamics is illuminated. Conditions for the existence of the exact solution for the aforementioned type of flows were obtained, for which non-stationary helical flow with invariant Bernoulli -function satisfying to the Laplace equation was considered. The spatial and time-dependent parts of the pressure field of the fluid flow should be determined via Bernoulli -function if components of the velocity of the flow are already obtained. Analytical and numerical findings are outlined, including outstanding graphical presentations of various types of constructed solutions, in order to elucidate dynamic snapshots that show the timely development of the topological behavior of said solutions.

Keywords: couple stress fluid; micropolar fluid; bipolar vector Laplacian; non-stationary helical flow; Beltrami flow (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2023
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