Type of Document Dissertation Author Zemlyanova, Anna URN etd-06182010-150903 Title Method of Riemann Surfaces in Modelling of Cavitating Flow Degree Doctor of Philosophy (Ph.D.) Department Mathematics Advisory Committee
Advisor Name Title Antipov, Yuri Committee Chair Baldridge, Scott Committee Member Hoffman, Jerome Committee Member Lipton, Robert Committee Member Tom, Michael Committee Member Adrian, Donald Dean's Representative Keywords
- cavitation
- Riemann surface
- Riemann-Hilbert problem
- conformal mapping
Date of Defense 2010-04-16 Availability unrestricted Abstract This dissertation is concerned with the applications of the Riemann-Hilbert problem ona hyperelliptic Riemann surface to problems on supercavitating flows of a liquid around
objects. For a two-dimensional steady irrotational flow of liquid it is possible to introduce a complex potential w(z) which allows to apply the powerful methods of complex analysis
to the solution of fluid mechanics problems. In this work problems on supercavitating flows of a liquid around one or two wedges have been stated. The Tulin single-spiral-vortex model is employed as a cavity closure condition. The flow domain is transformed into an auxiliary domain with known boundaries using the conformal mapping method.
After that the problems have been reduced to the solution of Riemann-Hilbert problems on elliptic or hyperelliptic Riemann surfaces. The final step is to solve a system of transcendental equations which is accomplished numerically. The numerical results are presented. To the best of the author’s knowledge no numerical results were available for non-linear problems on supercavitating flows in multiply connected domains before.
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