Improving the accuracy and consistency of the scalar auxiliary variable (SAV) method with relaxation

M Jiang, Z Zhang, J Zhao - Journal of Computational Physics, 2022 - Elsevier
The scalar auxiliary variable (SAV) method was introduced by Shen et al. in [36] and has
been broadly used to solve thermodynamically consistent PDE problems. By utilizing scalar …

A generalized SAV approach with relaxation for dissipative systems

Y Zhang, J Shen - Journal of Computational Physics, 2022 - Elsevier
The scalar auxiliary variable (SAV) approach [31] and its generalized version GSAV
proposed in [20] are very popular methods to construct efficient and accurate energy stable …

Generalized SAV-exponential integrator schemes for Allen--Cahn type gradient flows

L Ju, X Li, Z Qiao - SIAM journal on numerical analysis, 2022 - SIAM
The energy dissipation law and the maximum bound principle (MBP) are two important
physical features of the well-known Allen--Cahn equation. While some commonly used first …

Higher-order energy-decreasing exponential time differencing Runge-Kutta methods for gradient flows

Z Fu, J Shen, J Yang - Science China Mathematics, 2024 - Springer
In this paper, we develop a general framework for constructing higher-order, unconditionally
energy-decreasing exponential time differencing Runge-Kutta (ETDRK) methods applicable …

Relaxation exponential Rosenbrock-type methods for oscillatory Hamiltonian systems

D Li, X Li - SIAM Journal on Scientific Computing, 2023 - SIAM
It is challenging to numerically solve oscillatory Hamiltonian systems due to the stiffness of
the problems and the requirement of highly stable and energy-preserving schemes. The …

Implicit-explicit relaxation Runge-Kutta methods: construction, analysis and applications to PDEs

D Li, X Li, Z Zhang - Mathematics of Computation, 2023 - ams.org
Spatial discretizations of time-dependent partial differential equations usually result in a
large system of semi-linear and stiff ordinary differential equations. Taking the structures into …

Stabilized exponential-SAV schemes preserving energy dissipation law and maximum bound principle for the Allen–Cahn type equations

L Ju, X Li, Z Qiao - Journal of scientific computing, 2022 - Springer
It is well-known that the Allen–Cahn equation not only satisfies the energy dissipation law
but also possesses the maximum bound principle (MBP) in the sense that the absolute value …

A new class of implicit–explicit BDFk SAV schemes for general dissipative systems and their error analysis

F Huang, J Shen - Computer Methods in Applied Mechanics and …, 2022 - Elsevier
We construct a new class of efficient implicit–explicit (IMEX) BDF k schemes combined with
a scalar auxiliary variable (SAV) approach for general dissipative systems. We show that …

Arbitrarily high-order linear energy stable schemes for gradient flow models

Y Gong, J Zhao, Q Wang - Journal of Computational Physics, 2020 - Elsevier
We present a paradigm for develo** arbitrarily high order, linear, unconditionally energy
stable numerical algorithms for general gradient flow models. We apply the energy …

New SAV-pressure correction methods for the Navier-Stokes equations: stability and error analysis

X Li, J Shen, Z Liu - Mathematics of Computation, 2022 - ams.org
We construct new first-and second-order pressure correctionschemes using the scalar
auxiliary variable approach for the Navier-Stokes equations. These schemes are linear …