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Main Title: Improved multislope MUSCL reconstruction on unstructured grids for shallow water equations
Author(s): Zhao, Jiaheng
Özgen, Ilhan
Liang, Dongfang
Hinkelmann, Reinhard
Type: Article
Language Code: en
Is Part Of: 10.14279/depositonce-8380
Abstract: In shallow water flow and transport modeling, the monotonic upstream‐centered scheme for conservation laws (MUSCL) is widely used to extend the original Godunov scheme to second‐order accuracy. The most important step in MUSCL‐type schemes is MUSCL reconstruction, which calculate‐extrapolates the values of independent variables from the cell center to the edge. The monotonicity of the scheme is preserved with the help of slope limiters that prevent the occurrence of new extrema during reconstruction. On structured grids, the calculation of the slope is straightforward and usually based on a 2‐point stencil that uses the cell centers of the neighbor cell and the so‐called far‐neighbor cell of the edge under consideration. On unstructured grids, the correct choice for the upwind slope becomes nontrivial. In this work, 2 novel total variation diminishing schemes are developed based on different techniques for calculating the upwind slope and the downwind slope. An additional treatment that stabilizes the scheme is discussed. The proposed techniques are compared to 2 existing MUSCL reconstruction techniques, and a detailed discussion of the results is given. It is shown that the proposed MUSCL reconstruction schemes obtain more accurate results with less numerical diffusion and higher efficiency.
Issue Date: 2018
Date Available: 29-Apr-2019
DDC Class: 627 Wasserbau
Subject(s): finite‐volume method
MUSCL scheme
shallow water
slope limiters
total variation diminishing
unstructured mesh
unstrukturiertes Netz
Journal Title: International journal for numerical methods in fluids
Publisher: Wiley
Publisher Place: Chichester
Volume: 87
Issue: 8
Publisher DOI: 10.1002/fld.4499
Page Start: 401
Page End: 436
EISSN: 1097-0363
ISSN: 0271-2091
Appears in Collections:FG Wasserwirtschaft und Hydrosystemmodellierung » Publications

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