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A shape Hessian-based analysis of roughness effects on fluid flowsYang, Shan 12 October 2011 (has links)
The flow of fluids over solid surfaces is an integral part of many technologies, and the analysis of such flows is important to the design and operation of these technologies. Solid surfaces, however,
are generally rough at some scale, and analyzing the effects of such
roughness on fluid flows represents a significant challenge. There are
two fluid flow situations in which roughness is particularly
important, because the fluid shear layers they create can be very
thin, of order the height of the roughness. These are very high
Reynolds number turbulent wall-bounded flows (the viscous wall layer
is very thin), and very low Reynolds number lubrication flows (the
lubrication layer between moving surfaces is very thin). Analysis in
both of these flow domains has long accounted for roughness through
empirical adjustments to the smooth-wall analysis, with empirical
parameters describing the fluid dynamic roughness effects. The ability
to determine these effects from a topographic description of the
roughness is limited (lubrication) or non-existent
(turbulence). The commonly used parameter, the equivalent
sand grain roughness,
can be determined in terms of the change in the rate of viscous energy
dissipation caused by the roughness
and is generally obtained by measuring the effects on a fluid flow.
However, determining fluid dynamic effects from
roughness characteristics is critical to effective engineering
analysis.
Characterization of this mapping from roughness topography
to fluid dynamic impact is the main topic of the dissertation.
Using the mathematical tools of shape calculus, we construct this mapping by defining the roughness functional and derive its first- and second- order shape derivatives, i.e., the derivatives of the roughness functional with respect to the roughness topography. The results of the shape gradient and complete spectrum of the shape Hessian are presented for the low Reynolds number lubrication flows. Flow predictions based on this derivative information is shown to be very accurate for small roughness.
However, for the study of high Reynolds number turbulent flows, the direct extension of the current approach fails due to the chaotic nature of turbulent flows. Challenges and possible approaches are discussed for the turbulence problem as well as a model problem, the sensitivity analysis of the Lorenz system. / text
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SHAPE OPTIMIZATION OF ELLIPTIC PDE PROBLEMS ON COMPLEX DOMAINSNiakhai, Katsiaryna January 2013 (has links)
<p>This investigation is motivated by the problem of optimal design of cooling elements in modern battery systems. We consider a simple model of two-dimensional steady state heat conduction described by elliptic partial differential equations (PDEs) and involving a one dimensional cooling element represented by an open contour. The problem consists in finding an optimal shape of the cooling element which will ensure that the solution in a given region is close (in the least square sense) to some prescribed target distribution. We formulate this problem as PDE-constrained optimization and the locally optimal contour shapes are found using the conjugate gradient algorithm in which the Sobolev shape gradients are obtained using methods of the shape-differential calculus combined with adjoint analysis. The main novelty of this work is an accurate and efficient approach to the evaluation of the shape gradients based on a boundary integral formulation. A number of computational aspects of the proposed approach is discussed and optimization results obtained in several test problems are presented.</p> / Master of Science (MSc)
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