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A Local Velocity Grid Approach for BGK Equation

Communications in Computational Physics 2014年第9期16卷 956-982页

作者： Florian Bernard angelo iollo Gabriella Puppo Department of Mechanical and Aerospace Engineering Politecnico di Torino10129 TorinoItaly. Univ.Bordeaux IMBUMR 5251F-33400 TalenceFrance.INRIAF-33400 TalenceFrance. Dip.di Scienza ed Alta Tecnologia Universita dell’InsubriaComoItaly

The solution of complex rarefied flows with the BGK equation and the Discrete Velocity Method(DVM)requires a large number of velocity grid points leading to significant computational *** propose an adaptive velocity grid approach exploiting the fact that locally in space,the distribution function is supported only by a sub-set of the global velocity *** velocity grid is adapted thanks to criteria based on local temperature,velocity and on the enforcement of mass *** in 1D and 2D are presented for different Knudsen numbers and compared to a global velocity grid BGK solution,showing the computational gain of the proposed approach.

关键词： Kinetic models BGK model discrete velocity method

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An Implicit Scheme for Moving Walls and Multi-Material Interfaces in Weakly Compressible Materials

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Communications in Computational Physics 2020年第1期27卷 116-144页

作者： Emanuela Abbate angelo iollo Gabriella Puppo Universit`a degli Studi dell’Insubria via ValleggioComo 22100Italy Universit́e Bordeaux IMBUMR 5251F-33400 TalenceFrance Equipe-projet Memphis Inria Bordeaux-Sud OuestF-33400 TalenceFrance La Sapienza Universit`a di Roma Piazzale Aldo Moro00185 RomaItaly

We propose a numerical method for the simulation of flows from weakly compressible to low Mach regimes in domains with moving ***-miscible weakly compressible materials separated by an interface are included as *** scheme is fully implicit and it exploits the relaxation all-speed scheme introduced in[1].We consider media with significantly different physical properties and constitutive laws,as fluids and hyperelastic *** proposed numerical scheme is fully Eulerian and it is the same for all *** present numerical validations by simulating weakly compressible fluid/fluid,solid/solid and solid/fluid interactions.

关键词： Multi-material interfaces moving boundaries low Mach regime Eulerian elasticity

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An Accurate Cartesian Method for Incompressible Flows with Moving Boundaries

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Communications in Computational Physics 2014年第5期15卷 1266-1290页

作者： M.Bergmann J.Hovnanian A.iollo Inria F-33400 TalenceFranceUniv.BordeauxIMBUMR 5251F-33400 TalenceFranceCNRSIMBUMR 5251F-33400 TalenceFrance.

An accurate cartesian method is devised to simulate incompressible viscous flows past an arbitrary moving *** Navier-Stokes equations are spatially discretized onto a fixed Cartesian *** body is taken into account via the ghost-cell method and the so-called penalty method,resulting in second-order accuracy in *** accuracy and the efficiency of the solver are tested through two-dimensional reference *** show the versatility of this scheme we simulate a threedimensional self propelled jellyfish prototype.

关键词： Viscous incompressible flow immersed boundary method penalty method cartesian grid self-propelled jellyfish.

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