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arXiv 2304.08313math.NAcs.NA
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包含全阶解时间导数快照的不可压缩流POD-ROM:压力的误差界

POD-ROMs for incompressible flows including snapshots of the temporal derivative of the full order solution: Error bounds for the pressure

Bosco García-Archilla, Volker John, Sarah Katz, Julia Novo

AI总结:

本文针对不可压缩Navier-Stokes方程的POD降阶模型,利用含速度时间导数和平均速度的快照,研究了两种压力近似方法,并证明了与粘度逆幂无关的压力误差界,数值实验验证了理论结果。

摘要:

研究了基于本征正交分解(POD)的不可压缩Navier--Stokes方程的降阶方法(ROM),该方法包含逼近来自全阶混合有限元方法(FOM)的速度时间导数的快照。此外,快照集合包含FOM的平均速度。FOM和POD-ROM都配备了grad-div稳定化。该方法的 velocity 误差分析已在文献中存在。本文研究了两种不同的压力近似计算程序,并证明了与粘度逆幂无关的压力误差界。数值研究支持了分析结果,并对两种方法进行了比较。

英文摘要:

Reduced order methods (ROMs) for the incompressible Navier--Stokes equations, based on proper orthogonal decomposition (POD), are studied that include snapshots which approach the temporal derivative of the velocity from a full order mixed finite element method (FOM). In addition, the set of snapshots contains the mean velocity of the FOM. Both the FOM and the POD-ROM are equipped with a grad-div stabilization. A velocity error analysis for this method can be found already in the literature. The present paper studies two different procedures to compute approximations to the pressure and proves error bounds for the pressure that are independent of inverse powers of the viscosity. Numerical studies support the analytic results and compare both methods.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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