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High-Order Central ENO Finite-Volume Scheme with Adaptive Mesh Refinement

机译:具有自适应网格细化的高阶中央ENO有限卷方案

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A high-order central essentially non-oscillatory (CENO) finite-volume scheme in combination with a block-based adaptive mesh refinement (AMR) algorithm is proposed for solution of hyperbolic systems of conservation laws on body-fitted multi-block mesh. The CENO scheme is based on a hybrid solution reconstruction procedure that combines an unlimited high-order fe-exact least-squares reconstruction technique following from a fixed central stencil with a monotonicity preserving limited piecewise linear reconstruction algorithm. Switching in the hybrid procedure is determined by a solution smoothness indicator that indicates whether or not the solution is resolved on the computational mesh. The hybrid approach avoids the complexity associated with other ENO schemes that require reconstruction on multiple stencils which in some cases can produce poorly conditioned coefficient matrices. A novel ft-refinement criterion based on the solution smoothness indicator is used to direct the refinement of the AMR mesh. The predictive capabilities of the proposed high-order AMR scheme are demonstrated for the Euler equations governing two-dimensional compressible gaseous flows. The ability of the scheme to accurately represent solutions with smooth extrema and yet robustly handle under-resolved and/or non-smooth solution content (i.e., shocks and other discontinuities) is shown for a range of problems. Moreover, the ability to perform mesh refinement in regions of smooth but under-resolved and/or non-smooth solution content until the desired resolution is achieved is also demonstrated.
机译:提出了一种高阶中心基本上非振荡(CENO)有限体积方案与基于块的自适应网格细化(AMR)算法组合,用于解决身体拟合多块网上的保护法的双曲线系统。 CENO方案基于混合溶液重建过程,该改建过程结合了无限的高阶FE-ACTICUS最小平方重建技术,该过程之后的固定中央模版与单调性保存有限的分段线性重建算法。在混合过程中切换由解决方案平滑度指示器确定,该方法指示是否在计算网格上解析了解决方案。混合方法避免了与在某些情况下需要在多个模板上重建的其他eno方案相关的复杂性,这在某些情况下可以产生差的条件矩阵。基于溶液平滑度指示器的新型FT-Preinement标准用于指示AMR网格的细化。所提出的高阶AMR方案的预测能力用于控制二维可压缩气体流动的欧拉方程。该方案准确地表示具有平滑极值和且强大地处理的溶液的能力,并且在一系列问题中显示出在分辨和/或非光滑的解决方案内容(即冲击和其他不连续)中示出。此外,还证明了在实现所需分辨率之前在平滑但不稳定的和/或非光滑溶液内容的区域中进行网格细化的能力。

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