Hilbert formulas for $r$-analytic functions and the Stokes flow about a biconvex lens
Authors:
Michael Zabarankin and Andrei F. Ulitko
Journal:
Quart. Appl. Math. 64 (2006), 663-693
MSC (2000):
Primary 30E20, 35Q15, 35Q30, 76D07
DOI:
https://doi.org/10.1090/S0033-569X-06-01011-7
Published electronically:
September 14, 2006
MathSciNet review:
2284465
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Abstract: The so-called $r$-analytic functions are a subclass of $p$-analytic functions and are defined by the generalized Cauchy-Riemann system with $p(r,z)=r$. In the system of toroidal coordinates, the real and imaginary parts of an $r$-analytic function are represented by Mehler-Fock integrals with densities, which are assumed to be meromorphic functions. Hilbert formulas, establishing relationships between those functions, are derived for the domain exterior to the contour of a biconvex lens in the meridional cross-section plane. The derivation extends the framework of the theory of Riemann boundary-value problems, suggested in our previous work, to solving the three-contour problem for the case of meromorphic functions with a finite number of simple poles. For numerical calculations, Mehler-Fock integrals with Hilbert formulas reduce to the form of regular integrals. The 3D problem of the axially symmetric steady motion of a rigid biconvex lens-shaped body in a Stokes fluid is solved, and the Hilbert formula for the real part of an $r$-analytic function is used to express the pressure in the fluid via the vorticity analytically. As an illustration, streamlines and isobars about the body, the vorticity and pressure at the contour of the body and the drag force exerted on the body by the fluid are calculated.
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Takagi Takagi, H. (1973). Slow Viscous Flow due to the Motion of a Closed Torus. Journal of Physical Society of Japan, Vol. 35, No. 4, pp. 1225–1227.
Ulitko Ulitko, A.F. (2002). Vectorial Decompositions in the Three-Dimensional Theory of Elasticity. Akademperiodika, Kiev, 342 pp. (in Russian)
Vekua Vekua, I.N. (1962). Generalized Analytic Functions. Oxford, Pergamon Press, 668 pp.
Vladimirov Vladimirov, V.S. (1971). Equations of Mathematical Physics. Marcel Dekker Inc., New York, 418 pp.
Wakiya80 Wakiya, S. (1980). Axisymmetric Stokes Flow about a Body Made of Intersection of Two Spherical Surfaces. Archiwum Mechaniki Stosowanej, Vol. 32, No. 5, pp. 809–817.
Wakiya76 Wakiya, S. (1976). Axisymmetric Flow of a Viscous Fluid near the Vertex of a Body. Fluid Mechanics, Vol. 78, Part 4, pp. 737–747.
Wakiya74 Wakiya, S. (1974). On the Exact Solution of the Stokes Equations for a Torus. Journal of Physical Society of Japan, Vol. 37, No. 3, pp. 780–783.
Wakiya67 Wakiya, S. (1967). Slow Motion of a Viscous Fluid around Two Spheres. Journal of Physical Society of Japan, Vol. 22, No. 4, pp. 1101–1109.
Hilbert Zabarankin M., Ulitko A.F. (2006). Hilbert Formulas for $r$-Analytic Functions in the Domain Exterior to Spindle. SIAM Journal on Applied Mathematics, Vol. 66, No. 4, pp. 1270–1300.
thesis Zabarankin, M. (1999). Exact Solutions to Displacement Boundary-value Problems for an Elastic Medium with a Spindle-shaped Inclusion. Ph.D. Thesis, National Taras Shevchenko University of Kiev, Kiev, 180 pp. (in Russian).
izvestia Zabarankin, M. (1999). A Unified Approach to Solving the Generalized Cauchy-Riemann System. Reports of National Academy of Sciences of Ukraine, No. 5, pp. 30–33 (in Russian).
Zabarankin Zabarankin, M., Ulitko, A.F. (1999). The Stokes Flow about a Spindle in Axisymmetric Case. Bulletin of National Taras Shevchenko University of Kiev in the field of Mathematics and Mechanics, Issue 3, pp. 58–66 (in Ukrainian).
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Additional Information
Michael Zabarankin
Affiliation:
Department of Mathematical Sciences, Stevens Institute of Technology, Castle Point on Hudson, Hoboken, New Jersey 07030
Email:
mzabaran@stevens.edu
Andrei F. Ulitko
Affiliation:
Department of Mechanics and Mathematics, National Taras Shevchenko University of Kiev, 7 Academic Glushkov Prospect, Kiev, Ukraine
Keywords:
$r$-analytic function,
generalized Cauchy-Riemann system,
Hilbert formula,
Riemann boundary-value problem,
analytic function,
biconvex lens,
toroidal coordinates,
Mehler-Fock integral transform,
Stokes model,
pressure,
vorticity,
drag force
Received by editor(s):
October 24, 2005
Published electronically:
September 14, 2006
Article copyright:
© Copyright 2006
Brown University
The copyright for this article reverts to public domain 28 years after publication.