Анализ эффективности симплектических схем высокого порядка точности на примере задачи о соударении наночастицы с преградой
Авторы
-
Е. В. Ворожцов
Ключевые слова:
молекулярная динамика
уравнения Гамильтона
соударение наночастицы с преградой
EAM-потенциалы
многокомпонентные системы
симплектические разностные схемы
Аннотация
Работа посвящена применению метода молекулярной динамики (МД) для численного моделирования высокоскоростного взаимодействия твердых тел. Численно смоделировано явление отскока медной наночастицы от алюминиевой пластины. Для схемы Верле и новой симплектической схемы FR50, полученной ранее автором, найдены интервалы временных шагов, такие, что при задании временного шага в этих интервалах не происходит дрейфа полной энергии. При этом дрейф полной энергии возникает в случае схемы FR50 при гораздо больших шагах, чем в случае метода Верле. На основе анализа результатов численного моделирования задачи о соударении наночастицы с преградой показана необходимость введения в рассмотрение нескольких критериев подобия по аналогии с механикой сплошных сред. Предложен быстрый простой компьютерный тест для отбраковки ЕАМ-потенциалов до начала решения основной МД-задачи.
Раздел
Методы и алгоритмы вычислительной математики и их приложения
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