Describes all algorithms procedures in detail accompanied by c based. Thus, the study of hydraulic fracturing is of particular importance for petroleum industry. A discrete element method dem, also called a distinct element method, is any of a family of. Fdem is an innovative numerical technique, which has been intensively used in the past several decades in various engineering simulations. The combined finite element discrete element method fdem is a hybrid computational method developed by that exploits the advantages of the finite element method fem e. The combined finitediscrete element method is a recently developed numerical method aimed at modelling failing, fracturing andor fragmenting solids. The combined scaled boundary finitediscrete element method. Understanding and controlling the propagation of simultaneous.
A bridging subdomain is used, the hamiltonian is chosen as a linear combination of discrete and continuum hamiltonians. The combined finite discrete element method bridges the gap between finite and discrete element methods. When multiple hydraulic fractures propagate simultaneously, there is an interaction effect among these propagating hydraulic fractures, known as the stressshadow effect, which has a significant impact on the fracture geometry. New combined finitediscrete element numerical code. Simulation of crack induced nonlinear elasticity using the combined. This chapter presents a general overview of the combined finite discrete element method femdem which is considered as a stateof the art technique for the. The combined finite discrete element method a natural extension of both discrete and finite element methods allows researchers to model problems involving the deformability of either one solid body, a large number of bodies, or a solid body which fragments e. Combined finitediscrete element method modeling of. The combined finite discrete element method can be an advantageous tool for modelling of masonry structures. Novel discrete element modeling coupled with finite element method. Applications of finitediscrete element modeling to rock. In accounting for the computational cost, the qdem posits a constitutive law of a four. Pdf combined finitediscrete element method for simulation.
Hydraulic fracturing is widely used in the exploitation of unconventional gas such as shale gas. Once that the add boundary condition button is pressed, the current settings will be added to the internal database of bc and also displayed in a table on the right side of the page. Only terms differing one order in t at maximum are combined. A comprehensive treatment of the combined finite elementdiscrete element method is. However, it cannot model the fracturing process of rock driven by hydraulic pressure. Combining the modified discrete element method with the virtual.
Sep 22, 2015 hydraulic fracturing is widely used in the exploitation of unconventional gas such as shale gas. Combined finitediscrete element method for simulation of hydraulic fracturing article pdf available in rock mechanics and rock engineering 494 september 2015 with 1,007 reads. On the use of combined finitediscrete element method for. Our pdf merger allows you to quickly combine multiple pdf files into one single pdf document, in just a few clicks. This aim of this paper is to present the application of the combined finitediscrete element method fdem in structural mechanics. Fdem is an innovative numerical technique that combines the advantages of continuumbased modeling approaches and discrete element methods to overcome the inability of these methods to capture progressive damage and failure. The combined finitediscrete element method bridges the gap between.
Coverage of all algorithmic aspects of the combine finitediscrete element method. A combined finitediscrete element method is proposed for the prediction of reinforced concrete structure response under severe dynamic loads as impacts due to natural or anthropic hazards. Simultaneous multiple fracturing is a key technology to facilitate the production of shale oilgas. The combined finite discrete element method fdem proposed by munjiza is an innovative numerical technique to capture progressive damage and failure processes in rock. The new method is termed the combined finitediscrete element method. Pdf combined finitediscrete element method for simulation of. Fdem combines the advantages of both the finite and the discrete elements and enables the simulation of initiation and. The combined finite elementdiscrete element method fdem is a hybrid computational method developed by that exploits the advantages of the finite element method fem e. Thanks to the relatively inexpensive high performance hardware rapidly becoming available, it is possible to consider combined. Masonry is a heterogeneous structural material consisting of bricks joined by mortar layers.
In the modified discrete element mdem method, the effective forces between virtual particles are modified so that they reproduce the discretization of a firstorder finite element method fem for linear elasticity. Within the context of rock mechanics, the combined finite discrete element method fdem has been applied to many complex industrial problems such as block caving, deep mining techniques tunneling, pillar strength, etc. The combined scaled boundary finitediscrete element. Proceedings of the 18th international symposium on ice, iahr 2, 177184, 2006. The method combines aspects of both finite elements and discrete elements. The proposed model 25 considers the effects of the behaviour of dry stone masonry structures strengthened with steel clamps and bolts 3 as well as masonry infill 4 and reinforced concrete elements 68 in confined masonry structures due to dynamic action. These methods combine the advantages of the continuum model and dem. The combined finitediscrete element method fdem proposed by munjiza is an innovative numerical technique to capture progressive damage and failure processes in rock. Combined finite discrete element method following the work by munjiza and owen, the combined finite discrete element method has been further developed to various irregular and deformable particles in many applications including pharmaceutical tableting, 8 packaging and flow simulations, 9 and impact analysis.
Modeling simultaneous multiple fracturing using the combined. In this approach, all the particles are modelled within the framework of the dem. The purpose of this paper is to present ygeo, a new numerical code for geomechanical applications based on the combined finitediscrete element method fdem. Introduction to the combined finitediscrete element method. The incorporation of deformation kinematics into the discrete element formulation has also led naturally to a combined finitediscrete element approach in which the problem is analysed by a combination of the two methods 5,14,16. The combined finitediscrete element method a natural extension of both discrete and finite element methods allows researchers to model problems involving the deformability of either one solid body, a large number of bodies, or a solid body which fragments e. As such, it has become a tool of choice for problems involving fracturing, fragmenting and. Finitediscrete element models for assessment and repair of. Pdf recent developments in the combined finitediscrete. Agian, you can assign name to bc sets in boundary condition set combobox and pick color for the set.
Combined finitediscrete element method for simulation of. A comprehensive treatment of the combined finite element discrete element method is. The combined finite discrete element method is a relatively new computational tool aimed at problems involving static and or dynamic behaviour of systems involving a large number of solid. You can also specify element surface pressure traction. Structural applications of the combined finitediscrete. The combined finitediscrete element method fdem proposed by munjiza is an innovative numerical technique to capture progressive damage. All the files you upload, as well as the file generated on our server, will be deleted permanently within an hour. A possible way to avoid this problem is to combine some particles, which are far away from the. The numerical modelling of masonry structures especially in the nonlinear range represents an.
Discrete element method time integration 6 velocity verlet has the following attractive properties. Solid domains are discretized into finite elements in the usual way dictated by the finite element method. The essence of this method is to merge the algorithmic. Introduction to the combined finite discrete element method. The errorcorrecting output code ecoc 7 is another example of a binary code approach combined with robust errorcorrecting coding. Oneversusall method and allpairs method are examples of solving multiclass problem by decomposing output spaces.
In the last decade of the 20th century, the discrete element method has been coupled with the finite element method. Simulation of crack induced nonlinear elasticity using the combined finitediscrete element method. The combined finitediscrete element method for structural. A framework for grand scale parallelization of the combined. The essence of this method is to merge the algorithmic advantages of dem. In a finitediscrete element analysis the main issues which require consideration, for both dynamic and quasistatic.
210 720 995 1096 1474 853 613 437 495 842 1369 902 857 62 1560 854 950 405 1269 485 968 401 452 803 1174 93 252 8 579 1220 247 1305