Two classes of improved fifth-order weighted compact nonlinear schemes for compressible Euler equations
Huanhuan Yang , Yanqun Jiang , Qinghong Tang
Electronic Research Archive ›› 2025, Vol. 33 ›› Issue (6) : 3834 -3856.
Two enhanced fifth-order weighted compact nonlinear schemes (WCNSs), namely the WCNS scheme with the modified ZN-type weights (WCNS-ZNM) and the perturbed WCNS scheme (WCNS-P), were proposed for compressible Euler equations. The WCNS-ZNM scheme incorporates an enhanced WENO-ZN-type nonlinear interpolation technique to obtain unknown flow values at cell edges. The WCNS-P scheme introduces perturbation terms containing a free parameter into the linear interpolations, effectively reducing numerical errors in smooth regions. A monotone polynomial interpolation approach was designed to enhance numerical stability by filtering out non-smooth regions and realizing the automatic switching between the WCNS-P and WCNS-ZNM schemes in smooth and non-smooth regions. Numerical results exhibit better accuracy and performance in resolving small-scale structures and shock waves, compared to the WCNS scheme with the WENO-Z and WENO-ZN weights.
Euler equations / WCNS-ZNM scheme / WCNS-P scheme / monotone polynomial interpolation / fifth-order accuracy
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