Конечно-разностная схема расщепления для численного моделирования течения крови в артериях
Авторы
-
Г. В. Кривовичев
-
Р. В. Пухаленко
Ключевые слова:
уравнения гемодинамики
схема расщепления
устойчивость
Аннотация
Работа посвящена построению схемы расщепления для численного решения одномерных уравнений, описывающих течение крови. Такие уравнения получаются посредством осреднения системы уравнений гидродинамики по поперечному сечению сосуда. Предложена нелинейная неявная схема с конечно-разностными аппроксимациями второго порядка по пространственной переменной. Показана безусловная устойчивость схемы по начальным условиям. Для практической реализации предлагается применять метод расщепления, при котором расчеты на каждом слое по времени проводятся в два этапа. Это позволяет свести задачу к последовательному решению линейных систем с трехдиагональными матрицами. При решении тестовой задачи с известным аналитическим решением показано, что на практике достигается второй порядок сходимости. Проведены численные эксперименты по сравнению предложенной схемы с известными явными разностными схемами второго порядка, в ходе которых исследовались течения в модельных сосудистых системах. Показано, что предложенная схема обладает большей вычислительной эффективностью и позволяет проводить расчеты с меньшим числом шагов и за меньшее время.
Раздел
Методы и алгоритмы вычислительной математики и их приложения
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