A unified framework to generate optimized compact finite difference schemes

A unified framework to derive optimized compact schemes for a uniform grid is presented. The optimized scheme coefficients are determined analytically by solving an optimization problem to minimize the spectral error subject to equality constraints that ensure specified order of accuracy. A rigorous stability analysis for the optimized schemes is also presented. We also show that other types of schemes e.g., spatially explicit and biased finite differences, can be generated as special cases of the framework. Optimized schemes generated using this framework are tested on canonical partial differential equations, and numerical results are compared with the standard schemes. (C) 2021 Elsevier Inc. All rights reserved.