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PRISMS-PF:A general framework for phase-field modeling with a matrix-free finite element method

npj Computational Materials 2020年第1期6卷 1421-1432页

作者： Stephen DeWitt Shiva Rudraraju david montiel W.Beck Andrews Katsuyo Thornton University of Michigan Department of Materials Science and Engineering2300 Hayward St.Ann ArborMI 48109USA University of Michigan Department of Mechanical Engineering2350 Hayward St.Ann ArborMI 48109USA University of Wisconsin MadisonWI 53706USA

A new phase-field modeling framework with an emphasis on performance,flexibility,and ease of use is *** among the strategies employed to fulfill these objectives are the use of a matrix-free finite element method and a modular,application-centric code *** approach is implemented in the new open-source PRISMS-PF *** performance is enabled by the combination of a matrix-free variant of the finite element method with adaptive mesh refinement,explicit time integration,and multilevel *** testing with a particle growth problem shows PRISMS-PF with adaptive mesh refinement and higher-order elements to be up to 12 times faster than a finite difference code employing a second-order-accurate spatial discretization and first-order-accurate explicit time integration.

关键词： structure finite element

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p-Cresol mineralization and bacterial population dynamics in a nitrifying sequential batch reactor

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Journal of Environmental Sciences 2014年第9期26卷 1885-1893页

作者： Carlos david Silva Lizeth Beristain-montiel Flor de Maria Cuervo-López Anne-Claire Texier Department of Biotechnology-CBS Universidad Autónoma Metropolitana-IztapalapaMexico City 09340Mexico Department of Process and Technology-CNI Universidad Autónoma Metropolitana-CuajimalpaMexico City 05300Mexico

The ability of a nitrifying sludge to oxidize p-cresol was evaluated in a sequential batch reactor （SBR）. p-Cresol was first transformed to p-hydroxybenzaldehyde and p-hydroxybenzoate, which were later mineralized. The specific rates of p-cresol consumption increased throughout the cycles. The bacterial population dynamics were monitored by using denaturing gradient gel electrophoresis 0DGGE） and sequencing of DGGE fragments. The ability of the sludge to consume p-cresol and intermediates might be related to the presence of species such as Variouorax paradoxus and Thauera mechernichensis, p-Cresol （25 to 200 mg C/L） did not affect the nitrifying SBR performance （ammonium consumption efficiency and nitrate production yield were close to 100% and 1, respectively）. This may be related to the high stability observed in the nitrifying communities. It was shown that a nitrifying SBR may be a good alternative to eliminate simultaneously ammonium and p-cresol, maintaining stable the respiratory process as the bacterial community.

关键词： Nitrificationp-Cresol oxidationSequential batch reactorPopulation dynamicsEcological indices

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