| Summary: | 碩士 === 國立臺灣大學 === 機械工程研究所 === 81 === The complex geometries and turbulent flow are usually
encountered in engineering application , for example , kindey-
shape combustor , diffuser e.t.c. Numerical methods predicting
fluid flow are restricted by the complex geometries , because
it is difficult to treat boundary of irregular configurations .
Therefore , nonorthogonal coordinate system has been developed
rapidly . The velocity components can be classified into the
contravariant and covariant velocities . Numerical method based
on contravariant or covariant velocity can solve the fluid
flow in complex geometries . The present study using covariant
velocity components at nonorthogonal curvilinear coordinate
system predicts turbulent flow in a complex configuration .
The results show that the numerical method predicts well at
Cartesian curvilinear coordinate system . But ,the convergence
of mass is investigated further at Cylindrical curvilinear
coordinate system.
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