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• W25364546 abstract "A new mesh-adaptive ID collocation technique has been developed to efficiently solve transient advcction-dominated transport problems in porous media that are governed by a hyperbolic/parabolic (singularly perturbed) PDE. After spatial discretization a singularly perturbed ODE is obtained which is solved by a modification of the COLNEW ODE-collocation code. The latter also contains an adaptive mesh procedure that has been enhanced here to resolve linear and nonlinear transport flow problems with steep fronts where regular FD and FE methods often fail. An implicit first-order backward Euler and a third-order Taylor-Donea technique arc employed for the time integration. Numerical simulations on a variety of high Peclet-number transport phenomena as they occur in realistic porous media flow situations are presented. Examples include classical linear advection-diffusion, nonlinear adsorption, two-phase Buckley-Leverett flow without and with capillary forces (Rapoport-Leas equation) and Burgers’ equation for inviscid fluid flow. In most of these examples sharp fronts and/or shocks develop which are resolved in an oscillation-free manner by the present adaptive collocation method. The backward Euler method has some amount of numerical dissipation is observed when the time-steps are too large. The third-order Taylor-Donea technique is less dissipative but is more prone to numerical oscillations. The simulations show that for the efficient solution of nonlinear singularly perturbed PDE’s governing flow transport a careful balance must be struck between the optimal mesh adaptation, the nonlinear iteration method and the time-stepping procedure. More theoretical research is needed with this regard." @default.
• W25364546 created "2016-06-24" @default.
• W25364546 creator A5003587710 @default.
• W25364546 date "1995-01-01" @default.
• W25364546 modified "2023-09-25" @default.
• W25364546 title "A Mesh-Adaptive Collocation Technique for the Simulation of Advection-Dominated Single- and Multiphase Transport Phenomena in Porous Media" @default.
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• W25364546 doi "https://doi.org/10.1007/978-1-4612-4248-2_16" @default.
• W25364546 hasPublicationYear "1995" @default.
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