Higher-Order Finite Difference Scheme With TVD Filter Algorithm. Part 1: Simulations of Scalar Advective Dominant Problems.

نویسندگان

چکیده

Abstract Engquist et al. (1989) proposed non-linear TVD filters. When combined with a traditional higher-order finite difference scheme, these filters can simulate shock or high concentration gradient problems no spurious oscillations. Among the filter is algorithm 2.2. However, this flattens extrema that are not results of overshooting and consequency scheme reduces to low order accuracy locally around smooth extrema. Modification 2.2 has been in paper overcome problem. Several conservative schemes considered for testing filter. Non-conservative consisting 4th 6th -order Runge-Kutta method also evaluated. The modified tested seven test cases, including pure advection scalar profiles, variable velocity, two inviscid burger equations, an advection-diffusion equation velocity dispersion, three solid bodies rotating fluid square side length 2, two-dimensional equation. numerical experiments showed applying filter, non-TVD solving equation, produce accurate solutions oscillations clipping effect Keywords : Non-Oscillatory schemes, advection, Abstrak dkk. mengusulkan non-linear. Ketika dikombinasikan dengan skema beda hingga orde tinggi tradisional, ini dapat mensimulasikan kejutan atau masalah gradien konsentrasi tanpa osilasi palsu. Di antara yang diusulkan adalah algoritma Namun, meratakan ekstrem bukan merupakan hasil dari “overshooting” dan konsekuensinya tersebut direduksi ke tingkat akurasi rendah secara lokal di sekitar halus. Modifikasi telah dalam makalah untuk mengatasi ini. Beberapa konservatif dipertimbangkan menguji TVD. Skema non-konservatif metode ke-4 ke-6 juga dievaluasi. Filter dimodifikasi diuji tujuh kasus, termasuk adveksi murni profil skalar, kecepatan bervariasi, dua persamaan inviscid, adveksi-difusi bervariasi dispersi, tiga benda padat berputar oleh aliran bidang persegi panjang sisi dimensi. Eksperimen numerik menunjukkan bahwa penerapan dimodifikasi, menyelesaikan adveksi, menghasilkan solusi akurat efek kliping Kata Kunci osilasi, TVD, orde-akurasi

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ژورنال

عنوان ژورنال: Jurnal Teknik Sipil

سال: 2022

ISSN: ['2621-8429', '1412-3576']

DOI: https://doi.org/10.5614/jts.2022.29.2.1