HOSS: một ứng dụng của phương pháp phần tử hữu hạn - phân tán kết hợp
Tóm tắt
Gần ba mươi năm kể từ khi ra đời, phương pháp phần tử hữu hạn - phân tán kết hợp (FDEM) đã có những bước tiến đáng kể trong việc trở thành công cụ phân tích chủ yếu trong lĩnh vực Cơ học Tính toán. FDEM được phát triển để hiệu quả “kết nối khoảng cách” giữa hai phương pháp Cơ học Tính toán khác nhau được biết đến với tên gọi là phương pháp phần tử hữu hạn và phương pháp phần tử phân tán. Tại Phòng thí nghiệm Quốc gia Los Alamos (LANL), các nhà nghiên cứu đã phát triển Bộ phần mềm Tối ưu hóa Kết hợp (HOSS) như một nền tảng đa vật lý hybrid, dựa trên FDEM, cho việc mô phỏng hành vi vật liệu rắn được bổ sung bằng những cải tiến công nghệ mới nhất cho tương tác đầy đủ giữa chất lỏng và chất rắn. Trong HOSS, một số thuật toán FDEM mới được phát triển đã được triển khai, mang lại các công thức biến dạng vật liệu chính xác hơn, các bộ giải tương tác giữa các hạt, và các giải pháp về nứt và phân mảnh. Ngoài ra, một bộ giải động lực học chất lỏng tính toán tường minh và một số thuật toán tương tác giữa chất lỏng - chất rắn mới đã được tích hợp hoàn toàn (không chỉ liên kết) vào bộ giải cơ học rắn của HOSS, cho phép nghiên cứu một loạt vấn đề rộng hơn. Những bước tiến như vậy đang dẫn HOSS trở thành công cụ lựa chọn cho các vấn đề đa vật lý. HOSS đã được áp dụng thành công bởi rất nhiều nhà nghiên cứu để phân tích trong cơ học đá, ngành công nghiệp dầu khí, ứng dụng kỹ thuật (kỹ thuật cấu trúc, cơ khí và y sinh), khai thác mỏ, tải nổ, tác động tốc độ cao, cũng như phân tích địa chấn và âm học. Bài báo này nhằm tóm tắt những phát triển và nỗ lực ứng dụng mới nhất cho HOSS.
Từ khóa
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