MÔ PHỎNG XOÁY TÁCH RỜI TRONG NGHIÊN CỨU CÁC ĐẶC TRƯNG KHÍ ĐỘNG CỦA DÒNG CHẢY RỐI TRÊN VÙNG TƯƠNG TÁC

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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.28

Bộ sưu tập: Metadata

ID: 380939

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Dòng chảy rối trên vùng tương tác là hiện tượng phổ biến và xuất hiện nhiều trong lĩnh vực hàng không vũ trụ. Việc nghiên cứu dòng chảy rối trên vùng tương tác bằng phương pháp số phù hợp trong điều kiện tại Việt Nam. Hai phương pháp mô phỏng số được sử dụng trong phần lớn các nghiên cứu là phương pháp mô phỏng trực tiếp DNS và phương pháp mô phỏng xoáy lớn LES, trong khi có rất ít nghiên cứu sử dụng phương pháp mô phỏng xoáy tách rời DES. Trong bài báo này, nhóm tác giả sử dụng các phương pháp mô phỏng số như trung bình Reynolds RANS và mô phỏng xoáy tách rời DES để xây dựng một mô hình mô phỏng số cho phép nghiên cứu các đặc trưng khí động của dòng rối trên vùng tương tác. RANS được sử dụng để đánh giá sự độc lập của lưới. Với phương án lưới được lựa chọn tiến hành mô phỏng DES cho hai mô hình bao gồm mô hình DES-2D và mô hình DES-3D. Xử lý dữ liệu trường vận tốc thu được bằng mã nguồn Matlab, kết quả cho thấy các tham số của dòng trung bình đã bám sát kết quả thực nghiệm, trong khi động năng rối còn có sự sai số lớn. Phân tích POD và Q-criterion đã thể hiện được một số cấu trúc kích thước lớn trên vùng tương tác.The turbulent mixing layer is a phenomenon that occurs and has many applications in aeronautical engineering. The study of mixing layer turbulence by the numerical method is suitable under domestic conditions. Two numerical simulation methods are used in most studies including, direct numerical simulation DNS and large eddy simulation LES, while there are very few studies using detached eddy simulation DES. In this article, the authors use numerical simulation methods evolving Reynolds average Navier-Stokes simulation RANS and detached eddy simulation DES to propose a numerical simulation model that allows to study of the aerodynamic characteristics of the turbulent flow interaction. RANS is used to evaluate grid independence. With the selected mesh, two models counting the DES-2D model and the DES-3D model are conducted. Processing velocity field data with Matlab code, the results show that the average flow behavior has closely followed the experimental results, while the turbulent kinetic energy still has a large error. POD and Q-criterion analysis has shown some large coherent structures in the interaction region.

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