TY - JOUR
T1 - High Order Asymptotic Preserving Well-Balanced Finite Difference WENO Schemes for All-Mach Full Euler Equations with Gravity
AU - Huang , Guanlan
AU - Xing , Yulong
AU - Xiong , Tao
JO - Communications in Computational Physics
VL - 4
SP - 1130
EP - 1172
PY - 2025
DA - 2025/09
SN - 38
DO - http://doi.org/10.4208/cicp.OA-2023-0118
UR - https://global-sci.org/intro/article_detail/cicp/24355.html
KW - Compressible Euler equations, all-Mach numbers, finite difference WENO, asymptotic preserving, well-balanced, gravity.
AB - <p style="text-align: justify;">In this paper, we propose a high order semi-implicit well-balanced finite difference scheme for all-Mach Euler equations with a gravitational source. We start with
the conservative form of full compressible Euler equations including conservation of
total energy, for shock capturing in the high Mach regime. For asymptotic preserving
in the low Mach regime and to address the difficulty of strong coupling between the
stiff gravitational source and conservative variables, we add the evolution equation of
the perturbation of potential temperature, which corresponds to weak potential temperature stratification under a hydrostatic background potential temperature. The resulting system is then split into a (non-stiff) nonlinear low dynamic material wave to
be treated explicitly, and (stiff) fast acoustic and gravity waves to be treated implicitly.
With the aid of explicit time evolution for the perturbation of potential temperature,
we design a novel well-balanced finite difference weighted essentially non-oscillatory
(WENO) scheme, which can be proven to be both asymptotic preserving and asymptotically accurate in the incompressible limit. Numerical experiments are provided to
validate these properties.</p>