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|Title:||Computer-aided optimal design for laminar and turbulent fluid-thermal systems|
|Doctoral Committee Chair(s):||Tortorelli, Daniel A.|
|Department / Program:||Mechanical Science and Engineering|
|Degree Granting Institution:||University of Illinois at Urbana-Champaign|
|Abstract:||The finite-element method and the Newton-Raphson method are combined to investigate the momentum-, mass-, and energy-conservation equations for strongly coupled flow problems. Then the design sensitivities of the system response are computed and used in a numerical optimization algorithm to minimize pressure drop in flow through contractions. Both laminar and turbulent flows are considered. In the turbulent flow problems, the time-averaged momentum- and mass-conservation equations are solved using a mixing-length turbulence model.
Design sensitivities for a generalized response function with respect to design parameters which describe shape, material property, and load data are evaluated via the direct-differentiation method. All quantities are computed with the finite-element method. The efficiently computed sensitivities are verified by comparison with computationally intensive finite-difference sensitivity approximations.
A fully detailed development of the domain-parameterization method is presented for shape design-sensitivity analysis. The method is illustrated for the Laplace problem in which explicit shape sensitivities are derived by the adjoint and direct-differentiation methods. Both finite-element and boundary-element applications are discussed. The similarities between this approach and the isoparametric finite/boundary-element method are apparent.
|Rights Information:||Copyright 1995 Wang, Zi-Xian|
|Date Available in IDEALS:||2011-05-07|
|Identifier in Online Catalog:||AAI9543764|
This item appears in the following Collection(s)
Graduate Dissertations and Theses at Illinois
Graduate Theses and Dissertations at Illinois
Dissertations and Theses - Mechanical Science and Engineering