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Оптимизация симметричного профиля методом сопряженного градиента

Оптимизация симметричного профиля методом сопряженного градиента

Abstract

The numerical optimization algorithm of the profile form on the basis of conjugated gradient method is developed. Feature of the method is possibility to use a great number design variable (the sizes defining the form of a profile) as machine time of the problem decision of optimization practically doesn't depend on their quantity. The direct problem described by the equations of Navier-Stokes for two-dimensional stationary current of a liquid, dares a method of control volume by means of algorithm SIMPLE. For reception of purpose function gradient it is necessary to solve conjugated equations which are defined from the equations of Navier-Stokes. The conjugated equations dare by means of adapted algorithm SIMPLE. Thus, on each optimization iteration machine time is approximately equal to machine time of the decision of two direct problems. The given method has been used for the decision of a problem of front resistance minimization of symmetric profile at set chord and the area.

Разработан численный алгоритм оптимизации формы профиля на основе метода сопряженного градиента. Особенностью метода является возможность использовать большое число проектных переменных (величин, определяющих форму профиля), так как машинное время решения задачи оптимизации практически не зависит от их количества. Прямая задача, описываемая уравнениями Навье-Стокса для двумерного стационарного течения жидкости, решается методом контрольного объема при помощи алгоритма SIMPLE. Для получения градиента функции цели необходимо решить сопряженные уравнения, которые определяются из уравнений Навье-Стокса. Сопряженные уравнения решаются при помощи адаптированного алгоритма SIMPLE. Таким образом, на каждой итерации оптимизации машинное время приблизительно равно машинному времени решения двух прямых задач. Данный метод был использован для решения задачи минимизации лобового сопротивления симметричного профиля при заданной хорде и площади.

Keywords

ОПТИМИЗАЦИЯ, ФУНКЦИЯ ЦЕЛИ, ФУНКЦИИ ОГРАНИЧЕНИЙ, ПРОЕКТНЫЕ ПЕРЕМЕННЫЕ, СОПРЯЖЕННЫЕ УРАВНЕНИЯ, ПРОФИЛЬ, МЕТОД КОНТРОЛЬНОГО ОБЪЕМА

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
gold