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Steady two-dimensional viscous flow in a jet

Published online by Cambridge University Press:  29 March 2006

K. Capell
K. Capell
Affiliation:
Department of Mathematics, University of Queensland
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Abstract

An idealized two-dimensional flow due to a point source of x momentum is discussed. In the far field the flow is modelled by a jet region of large vorticity outside which the flow is potential. After use of the transformation \[ \zeta^3 = (\xi + i\eta)^3 = x + iy, \] the equations suggest naively obvious asymptotic expansions for the stream function in these two regions, namely \[ \sum_{n=0}^{\infty}\xi^{1-n}f_n(\eta)\quad {\rm and}\quad\sum_{n=0}^{\infty}\xi^{1-n}F_n(\eta/\xi) \] respectively. Consistency in matching these expansions is achieved by including logarithmic terms associated with the occurrence of eigensolutions. Fn is easy to find and Jn can be found in closed form so the inner and outer eigensolutions may be fully determined along with the complete structure of the expansions.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 55 , Issue 1 , 12 September 1972 , pp. 49 - 63
Copyright
© 1972 Cambridge University Press

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References

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