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Numerical simulation of mud-flows impacting structures

Journal of Mountain Science 2019年第2期16卷 364-382页

作者： GRECO Massimo di cristo cristiana IERVOLINO Michele VACCA Andrea diCEA Università di Napoli Federico II di Università della Campania Luigi Vanvitelli

The study of the interaction of mud-flows with obstacles is important to define inundation zones in urban areas and to design the possible structural countermeasures. The paper numerically investigates the impact of a mud-flow on rigid obstacles to evaluate the force acting on them using two different depth-integrated theoretical models, Single-Phase Model(SPM) and Two-Phase Model(TPM), to compare their performance and limits. In the first one the water-sediment mixture is represented as a homogeneous continuum described by a shearthinning power-law rheology. Alternatively, the twophase model proposed by di cristo et al in 2016 is used, which separately accounts for the liquid and solid phases. The considered test cases are represented by a 1D landslide flowing on a steep slope impacting on a rigid wall and a 2D mud dam-break flowing on a horizontal bottom in presence of single and multiple rigid obstacles. In the 1D test case, characterized by a very steep slope, the Two-Phase Model predicts the separation between the two phases with a significant longitudinal variation of the solid concentration. In this case the results indicate appreciable differences between the two models in the estimation of both the wave celerity and the magnitude of the impact, with an overestimation of the peak force when using the Single-Phase Model. In the 2D test-cases, where the liquid and solid phases remain mixed, even if the flow fields predicted by the two models present some differences, the essential features of the interaction with the obstacles, along with the maximum impact force, are comparable.

关键词： Mud-Flow Impact force Two-phase model Power-law

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Simplified Wave Models Applicability to Shallow Mud Flows Modeled as Power-Law Fluids

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Journal of Mountain Science 2014年第6期11卷 1454-1465页

作者： cristiana di cristo Michele IERVOLINO Andrea VACCA diCeM Università di Cassino e del Lazio Meridionale diCDEA Seconda Università di Napoli

Simplified wave models- such as kinematic,diffusion and quasi-steady- are widely employed as a convenient replacement of the full dynamic one in the analysis of unsteady open-channel flows,and especially for flood *** their use may guarantee a significant reduction of the computational effort,it is mandatory to define the conditions in which they may be confidently *** present paper investigates the applicability conditions of the kinematic,diffusion and quasisteady dynamic shallow wave models for mud flows of power-law *** power-law model describes in an adequate and convenient way fluids that at low shear rates fluids do not posses yield stress,such as clay or kaolin suspensions,which are frequently encountered in Chinese *** the framework of a linear analysis,the propagation characteristics of a periodic perturbation of an initial steady uniform flow predicted by the simplified models are compared with those of the full dynamic *** on this comparison,applicability criteria for the different wave approximations for mud flood of power-law fluids are *** presented results provide guidelines for selecting the appropriate approximation for a given flow problem,and therefore they may represent a useful tool for engineering predictions.

关键词： Power-law fluid Unsteady flows Shallow flows Simplified wave models

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Simulation of dam-break waves on movable beds using a multi-stage centered scheme

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International Journal of Sediment Research 2013年第3期28卷 269-284页

作者： Stefania EVANGELISTA Mustafa S.ALTINAKAR cristiana di cristo Angelo LEOPARdi dipartimento di Ingegneria Civile e Meccanica Universita degli Studi di Cassino e del Lazio Meridionale NCCHE National Center for Computational Hydroscience and EngineeringUniversity of Mississippi

This paper presents the application of the multi-stage first-order centered scheme GMUSTA to solve a two-phase flow model with four equations for simulating dam-break floods without and with sediment *** of generalized Riemann invariants can be particularly complex and costly in simulating dam-break floods with sediment *** numerical scheme,which does not require complete knowledge of the eigenstructure of the hyperbolic mathematical model,offers a suitable and attractive *** quality of the dam-break flood simulations with GMUSTA scheme is verified by comparing the results against laboratory tests and some experimental data available in the literature,on fixed and mobile bed conditions,with different bed materials and flush or stepped *** numerical results reproduce quite well the experimental evidence,proving that the model is capable of predicting the temporal evolution of the free-surface and the *** GMUSTA scheme,which is not only simple to implement but also both accurate and computationally efficient,is proposed as an appropriate tool for integrating non-equilibrium sediment-transport models.

关键词： Dam break Sediment transport Shallow water Multi-stage scheme GMUSTA

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