NGHIÊN CỨU CÁC CẤU TRÚC LỚN TRONG VÙNG TƯƠNG TÁC CHẢY RỐI BẰNG PHƯƠNG PHÁP TƯƠNG QUAN HAI ĐIỂM=INVESTIGATING LARGE-SCALE STRUCTURES IN TURBULENT MIXING LAYERS USING TWO-POINT CORRELATION

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Tác giả: Anh Tuấn Nguyễn, Trung Dũng Nguyễn, Thế Hùng Trần

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Journal of Science and Technique, 2024

Mô tả vật lý: tr.57

Bộ sưu tập: Metadata

ID: 486674

Thêm vào giỏ

Sự hình thành và phát triển của các cấu trúc xoáy kích thước lớn là một trong các đối tượng nghiên cứu chính về dòng chảy rối trên vùng tương tác. Mục tiêu chính của bài báo này là trực quan hóa các cấu trúc này từ dữ liệu thực nghiệm đã được công bố giúp nâng cao hiểu biết về các hành vi dòng chảy phức tạp. Trong bài báo này, nhóm tác giả sử dụng phương pháp tương quan thống kê hai điểm để đánh giá kích thước các cấu trúc xoáy lớn dọc theo dòng chảy. Bài báo cũng trình bày hướng dẫn phân tích phổ năng lượng rối tại các điểm cố định đã chọn. Các tính toán được thực hiện trên phần mềm MATLAB. Kết quả thu được cho thấy tại khu vực bắt đầu vùng tương tác, các xoáy có kích thước nhỏ với độ bất đẳng hướng cao, các cấu trúc lớn có xu hướng bị kéo căng theo các hướng không đều. Xuôi theo dòng chảy, kích thước các xoáy có xu hướng tăng lên theo các hướng, đồng thời mức độ bất đẳng hướng có xu hướng giảm. Trong vùng đồng dạng, trạng thái đẳng hướng gần như đạt được. Các phát hiện về phân tích phổ năng lượng cho thấy bằng chứng phù hợp với thuyết truyền năng lượng trong dòng chảy rối của Kolmogorov. Phương pháp tương quan thống kê hai điểm thực sự hiệu quả để phân tích về các cấu trúc trong dòng chảy rối.The formation and development of large-scale structures are primary research subjects in the study of turbulent mixing layers. Visualizing these structures based on published experimental data enhances the understanding of complex flow behaviors, which is the main objective of this article. The authors employed a two-point statistical correlation method to evaluate the size of large vortex structures along the interaction region. Additionally, the article provides a guide for analyzing the turbulent energy spectrum at selected fixed points. The calculations were performed using MATLAB software. The results indicate that at the beginning of the mixing layer, the vortices are small and highly anisotropic, with large-scale structures stretching in irregular directions. Further downstream, the vortices increase in size in all directions, and the degree of anisotropy decreases. In the self-similar region, isotropic states are almost achieved. The energy spectrum analysis findings align with Kolmogorov's theory of energy cascade in turbulent flow. The two-point statistical correlation method proves to be highly effective for analyzing structures within turbulent flows.

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