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Abstract
A study of large eddy simulation (LES) approach as a tool for
treating the turbulent flow is presented. The approach utilizes spatial
mathematical filtering operation in computing large eddies numerically
while modeling small eddies.
A complete review of the theory, reasons, advantages and
disadvantages of LES is presented comparatively with its alternatives. A
full comparative analysis of the different techniques and methods related
to filtering, modeling and numerical procedure for LES are developed.
This comparative analysis is essential for ensuring efficient and precise
LES analysis of turbulent flow.
A subjective general computer program is developed for studying
turbulent flow using LES. The developed computer model is applied for
studying the motion of a liquid flow with a free surface in a broken dam
model. Results of the mathematical and computer models success to
simulate the known results of the concerned real application, which give
the validity of using these models for handling similar applications.
An important type of LES error called the commutation error may
appear through the filtering process. A definition of the commutation
error is developed and used for adjusting the factors that can eliminate or
control the error effect. The analysis is used for classifying filters
according to their simplicity and accuracy