Summary
A finite difference approximation to the ordinary differential equations governing the flow between a pair of rotating coaxial discs is examined. It is shown that when the Reynolds number is small or large the finite difference equations can be solved to give the analytic expansions that would be obtained from the continuous equations. As the Reynolds number tends to infinity there is more information retained in the finite difference approximations than in the corresponding limiting continuous equations and this fact is used to eliminate some of the possible flows outside the boundary layers on the discs. The method is quite general and can be applied to other singular perturbation problems.
Résumé
On considérera ici une approximation différentielle finie de l'équation différentielle ordinaire qui gouverne les mouvements d'un fluide pris dans la rotation de deux disques unis par un même axe. On montrera que quand le nombre de Reynolds est petit ou grand, les équations différentielles finies peuvent être résolues de telle façon qu'elles donnent le détail analytique des développements qui pourraient résulter d'équations continues. Comme le nombre de Reynolds tend vers l'infini, l'approximation différentielle définitive est porteuse de plus d'information que ne l'est l'équation continue nécessairement plus limitée qui lui correspond; on s'appuiera sur cette constatation pour éliminer certains des écoulements possibles à l'extérieur de la couche limite formée par les disques. On verra que cette méthode, générale dans sa nature, peut être appliquée dans des cas particuliers où il existe des perturbations.
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References
T. von Karman,Über laminare und turbulente Reibung, Z. angew. Math. Mech.1, 232–252 (1921).
U. T. Boedewadt,Die Drehströmung über festem Grunde, Z. angew. Math. Mech.20, 241 (1940).
G. K. Batchelor,Note on a Class of Solutions of the Navier-Stokes Equations Representing Steady Rotationally Symmetric Flow, Q.J.M.A.M.4, 29 (1951).
K. Stewartson,On the Flow Between Two Rotating Coaxial Discs, Proc. Camb. Phil. Soc.49, 333 (1953).
K. K. Tam,A Note on the Asymptotic Solution of the Flow between Two Oppositely Rotating Infinite Plane Discs. SIAM J. Appl. Math.17, 1305 (1969).
G. L. Mellor, P. J. Chapple andV. K. Stokes,On the Flow between a Rotating and a Stationary Disc, J. Fluid Mech.31, 95 (1968).
G. N. Lance andM. H. Rogers,The Axially Symmetric Flow of a Viscous Liquid between Two Infinite Rotating Discs. Proc. Roy. Soc.A266, 109 (1962).
D. Greenspan,Numerical Studies of Flow between Rotating Coaxial Discs. J. Inst. Math. Applics9, 370–377 (1972).
K. E. Barrett (1972),On a Numerical Solution of Singular Perturbation Boundary Value Problems FMCC TR 13/72 Univ. Salford. To be published in Q.J.M.A.M.
D. N. de G. Allen andR. V. Southwell (1955),Relaxation Methods Applied to Determine the Motion, in Two Dimensions, of a Viscous Fluid Past a Cylinder, Q.J.M.A.M.
S. C. R. Dennis,Finite Differences Associated with Second Order Differential Equations, Q.J.M.A.M.13, 487–507 (1960).
S. C. R. Dennis,The Numerical Solution of the Vorticity Tronsport Equation, Proc. 3rd Int. Conf. Num. Meth. Fluid Mech. (Paris 1972) Vol. II pp. 120–129. Lect. Notes in Physics, Springer Verlag, Berlin 1973.
D. Grohne,Über die laminare Strömung in einer kreiszylindrischen Dose mit rotierendem Deckel, Nachr. Akad. Wiss. Göttingen12, 263 (1955).
H. Rasmussen,High Reynolds Number Flows between Two Infinite Rotating Discs, J. Australian Math. Soc.XII, 483–501 (1971).
C. E. Pearson,Numerical Solutions for the Time-dependent Viscous Flow between Two Rotating Coaxial Discs, J. Fluid Mech.21, 623–633 (1965).
I. Babuska,Numerical Stability in Problems of Linear Algebra, SIAM J. Num. Anal.9, 53–77 (1970).
J. B. McLeod andS. V. Parter,On the Flow between Two Counter Rotating Infinite Plane Discs, Arch. Rat. Mech. Anal.54, 301–327 (1974).
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Barrett, K.E. Numerical study of the flow between rotating coaxial discs. Journal of Applied Mathematics and Physics (ZAMP) 26, 807–817 (1975). https://doi.org/10.1007/BF01596082
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DOI: https://doi.org/10.1007/BF01596082