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element simulation » element formulation (Expander búsqueda), event simulation (Expander búsqueda), patient simulation (Expander búsqueda)
simulation model » simulacion del (Expander búsqueda), simulacion monte (Expander búsqueda), equation model (Expander búsqueda)
element simulation » element formulation (Expander búsqueda), event simulation (Expander búsqueda), patient simulation (Expander búsqueda)
simulation model » simulacion del (Expander búsqueda), simulacion monte (Expander búsqueda), equation model (Expander búsqueda)
1
artículo
Publicado 2025
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In this work, we consider the primitive equations of an ocean circulation model for the southern pacific, which consists of the time-dependent Navier-Stokes equations in the β-plane coupled with the temperature transport equation. Specifically, the full three-dimensional equations are adopted and formulated as a monolithic system of nonstationary, nonlinear, coupled partial differential equations. The El Nino phenomenon is simulated by the action of given wind stresses on the ocean surface. We present an approximation scheme with Crank-Nicolson finite differences in time, and in space we take inf-sup stable Galerkin finite elements for the Navier-Stokes part and bilinear elements for the temperature. We solve the resulting, nonlinear monolithic discrete system by Newton's method. Numerical experiments with realistic geometry and material data are conducted, which show the...
2
artículo
In this research work, shell deformations generated by surface forces acting on the shell are described and simulated. The Naghdi and Koiter models are used to describe shell deformations. A weak formulation for the model is obtained, and some results on the existence of solutions are presented. The finite element method is then used to obtain the deformations. In addition, simulations of shell deformations are shown for the case of sectional curvature k = 0.
3
artículo
The simulation model is a useful assessment tool to analyze in depth evaluation of investment projects, improving investor decision making. Contributes to investigate new project ideas and help identify investment opportunities aimed at the reformulation of projects, adapting to the attitudes and investor requirements. An alternative choice is the mathematics expectation that is used in the calculation of probabilities that an event occurs. The fact that a good estimate of the elements involved in the calculation of profitability is not conducted, can lead to invalidate the analysis, and therefore, can lead to approve unprofitable projects and vice versa. When is known the probability of an event occurring certain number of years, usually applies a certain percentage during that period. For example, if the probability of an event occurring is 20 years, a rate of 5% per annum will apply.
4
artículo
The simulation model is a useful assessment tool to analyze in depth evaluation of investment projects, improving investor decision making. Contributes to investigate new project ideas and help identify investment opportunities aimed at the reformulation of projects, adapting to the attitudes and investor requirements. An alternative choice is the mathematics expectation that is used in the calculation of probabilities that an event occurs. The fact that a good estimate of the elements involved in the calculation of profitability is not conducted, can lead to invalidate the analysis, and therefore, can lead to approve unprofitable projects and vice versa. When is known the probability of an event occurring certain number of years, usually applies a certain percentage during that period. For example, if the probability of an event occurring is 20 years, a rate of 5% per annum will apply.
5
artículo
Publicado 2016
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This paper presents the application of Galerkin method to discretize the model equation of groundwater ow in a conned aquifer semipermeable with tidal boundary conditions on one of itsborders, the other borders remain constant. For the simulations was generated a numerical program, Ground Water Finite Element Method, which implements the method of nite elements withtriangular elements with three nodes and a degree of freedom per node.
6
artículo
Publicado 2016
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This paper presents the application of Galerkin method to discretize the model equation of groundwater ow in a conned aquifer semipermeable with tidal boundary conditions on one of itsborders, the other borders remain constant. For the simulations was generated a numerical program, Ground Water Finite Element Method, which implements the method of nite elements withtriangular elements with three nodes and a degree of freedom per node.
7
artículo
Publicado 2019
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The performance of discrete element method (DEM) simulations is highly dependent on the requirements of the associated algorithms in terms of computer memory usage and CPU time. In particular, computer CPU time heavily depends on the identification of neighbor particles and the computation of particle-particle interactions. Over the years several neighbor particles searching methods have been developed. Accordingly, in this work the performance of two of well-known searching methods, linked cell and Verlet tables algorithms, are assessed in the context of the development of a new DEM-based tool. More specifically, the neighbor searching methods performance and related computational costs are parametrically analyzed and an assessment of their suitability for carrying the intended numerical simulations is provided. The referred numerical simulations are performed accounting for a canonical...
8
artículo
In this paper, a finite element model is presented to predict the hydrodynamics around hydrofoils. The proposed model solves the equations of conservation of mass and momentum, including advection, pressure and shear stress terms. To describe the influence of turbulence, the Prandtl- Kolmogorov model is considered. A transport equation is included in the formulation to simulate the evolution of water vapor fraction. Weakly reflective boundary conditions are imposed on open boundaries to avoid the intense reflections of the pressure waves that generate instability. Various numerical experiments are performed using the hydrodynamic profile NACA 0012. The non permanent model results reproduce the essential characteristics of the flows around the hidrofoils in various cases. The model is able to describe the mixture of liquid and vapor when the pressure is below the vapor pressure during cav...
9
artículo
Publicado 2018
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We gratefully acknowledge financial support by CONCYTEC Peru within the program Programa nacional de innovación para la competitividad y productividad (PNICP, 361-PNICP-PIBA-2014) as well as travel support by the Heidelberg Graduate School of Mathematical and Computational Methods for the Sciences (HGS MathComp). The second author was supported by the DFG Research Scholarship FR3935/1-1.
10
artículo
Publicado 2025
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This work focused on proposing a plan for improvement and control of the customer service process in a customer service center, based on a waiting line analysis where it describes all the elements that interact in the system and a statistical analysis of processes to define the state in which it operates. Subsequently, the simulation of processes is applied to represent the system studied, and with it, to be able to evaluate different strategies for improvement and increase in productivity. The following strategies were evaluated: correction of the instability of customer service processes
11
artículo
Publicado 2020
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This paper proposes a numerical finite-element-based model aimed at optimizing narrow-vein stope stability. This model combines empirical and numerical methods to develop a sequence, which may determine an acceptable stope safety factor. A stope stability analysis was conducted through the Mathews stability graph method, which requires two factors: the hydraulic radius (HR) and stability number (N'). The Mathews stability graph method is used to assess the stability of an underground design. Variations in stope dimensions are estimated by changing the HR and Factor A within the N', which is determined through numerical methods. The results of the numerical simulation indicate that the HR increases with an increase in stope dimensions, while Factor A maintains an inverse relationship with the maximum stress induced on the excavation walls. This document demonstrates the potential of combi...
12
artículo
Publicado 2025
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Background and Objective: A previous study investigated the in vitro release of methylene blue (MB), a widely used cationic dye in biomedical applications, from nanocellulose/nanoporous silicon (NC/nPSi) composites under conditions simulating body fluids. The results showed that MB release rates varied significantly with the nPSi concentration in the composite, highlighting its potential for controlled drug delivery. To further analyze the relationship between diffusion dynamics and the MB concentration, this study developed a finite element (FE) method to solve Fick’s equations governing the drug delivery system. Methods: Release profiles of MB from NC/nPSi composites with varying nPSi concentrations (0%, 0.1%, 0.5%, and 1.0%) were experimentally measured in triplicate using phosphate-buffered saline (PBS) at 37 °C, pH 7.4, and 100 rpm. Mathematical models incorporating linear and q...
13
artículo
Publicado 2020
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The early stages of the development of a finite element method (FEM) based computational tool for numerically simulating mineral-slurry transport involving both Newtonian and non-Newtonian flows are described in this work. The rationale behind the conception, design and implementation of the referred object-oriented programming tool is thus initially highlighted. A particular emphasis is put on several architectural aspects accounted for and object class hierarchies defined during the development of the tool. Next one of the main modules composing the tool under development is further described. Finally, as a means of illustration, the use of the FEM based tool for simulating two-dimensional laminar flows is discussed. More specifically, canonical configurations widely studied in the past are firstly accounted for. A more practical application involving the simulation of a mineral-slurry...
14
artículo
Publicado 2020
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A finite element method (FEM) based tool is used in this work to numerically modeling mineral-slurry like flows in a 3D lid-driven cavity. Accordingly, the context in which the referred FEM based tool is being developed is firstly emphasized. Both mathematical and numerical models utilized here are described next. A special emphasis is put on the flow governing equations and the particular FEM weighted residuals approach (Galerkin method) used to solve these equations. Since mineral-slurry flows both featuring relatively low flow velocities and containing large amounts of solid particles can be accounted for as laminar non-Newtonian flows, only laminar flows are discussed here. Indeed both Newtonian and non-Newtonian laminar flows are numerically studied using a 3D lid-driven cavity at two different Reynolds numbers. Two rheological models, power-law and Carreau-Yasuda, are utilized in t...
15
artículo
Publicado 2022
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The geometallurgical model is a tool that allows evaluating the necessity of mineral deposits from the geological, processing and production point of view. With this, it is possible to estimate the most realistic net present value and significantly reduce the technical-operational risk that occurs in the feasibility stages of a mining project. In the present investigation, an exhaustive search has been carried out on studies focused on geometallurgical modeling in porphyry copper deposits in which it has been estimated and simulated as geometallurgical total copper grade, oxide copper, penalizing elements, metallurgical recovery, bond work index and of abrasion. Through this research, it is evident that by incorporating geometallurgical attributes in the estimation of mineral resources, it is possible to better quantify the spatial variability of the deposit, anticipate those minerals th...
16
artículo
Publicado 2020
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The implementation of any software development process involves the consumption of critical resources. Software engineers cannot experiment with different development processes before starting them in real projects, due to the time that would entail and the amount of elements that are involved, so it is vital to have tools that allow the pre-visualization of the results of executing the software development process and how the environmental variables affect it, thus being able to anticipate under what conditions the software development process will be deployed. This paper presents the modelling and simulation of a software development process using System Dynamics (SD), which allows the graphical representation of the elements intervening in the software process, and the incorporation of as many relevant elements as possible. As a software costs estimation reference, the COCOMO estimati...
17
artículo
Publicado 2024
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Tailings dams are complex geotechnical structures that require a thorough analysis of their stability. The traditional method for assessing stability, the Limit Equilibrium Method (LEM), focuses on calculating the factor of safety (FS), but omits critical aspects such as the stress distribution along the regrowth process. The finite element method (FEM), based on the strength reduction technique (SSR), is an alternative that allows calculating the FS and understanding the real behavior of the slope, by analysing stresses along the different raises stage. In this study, the FEM method was used to simulate the Ancash tailings dam, Peru. The simulation allowed obtaining detailed information on the stress states to which the soil foundation is subjected at each stage of regrowth. The results obtained in terms of displacements and stresses provided a more accurate understanding of the failure...
18
artículo
Publicado 2012
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The atmosphere is a major element in the preservation of the quality of life we want. The population growth is one of the main factors that influence air pollution, for what is considered necessary to analyze the relationship of pollution and its effects on the population. The effect of these parameters on pollution and population health has been studied as a cause and effect so that using a computer simulation program; we can study their behavior in the future. In this way we would be in the potential for reducing air pollution, or at least prevent its increase, by control of these parameters.
19
artículo
Publicado 2012
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The atmosphere is a major element in the preservation of the quality of life we want. The population growth is one of the main factors that influence air pollution, for what is considered necessary to analyze the relationship of pollution and its effects on the population. The effect of these parameters on pollution and population health has been studied as a cause and effect so that using a computer simulation program; we can study their behavior in the future. In this way we would be in the potential for reducing air pollution, or at least prevent its increase, by control of these parameters.
20
artículo
Publicado 2025
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Para estimar el impacto de los terremotos en áreas urbanas, los investigadores convencionalmente utilizan modelos simplificados de estructuras urbanas para simulaciones. Sin embargo, los avances recientes en tecnología ahora permiten predicciones de respuesta ante terremotos más precisas a través de modelos de alta fidelidad y gemelos digitales. Los programas convencionales de generación de mallas pueden producir modelos 3D generales, pero no están optimizados para simulaciones urbanas a gran escala, donde el refinamiento de la malla cerca de las interfaces de los materiales es esencial. En este estudio, desarrollamos un método eficiente basado en la triangulación de Delaunay para simulaciones a escala urbana mediante la partición del modelo 3D en subdominios. El método propuesto utiliza de manera integrada la información del modelo de elevación digital y del modelo de veloci...
