Browsing Infraestructura Vial - GIVIAL by Author "ddf5c56fad665148eaacb953bbe77785"

Cold cutting processes are characterized to perform the kinetic energy needed to cut hard materials with little mechanical effort by means of the ultra-high flow pressure pumps, which produce water jets with a flow pressure ...

The role of computational modeling is becoming predominant in the exploration and evaluation of new technologies. Numerical simulations have solved the most complex phenomena immersed in thermal sciences by the implementation ...

2D Simulation of Two-Phase Flow for Water Jet Cutting Processes with OpenFOAM
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Florez, Eder | 2021

Cold cutting processes are characterized to perform the kinetic energy needed to cut hard materials with little mechanical effort by means of the ultra-high flow pressure pumps, which produce water jets with a flow pressure value of around 90 ksi. These manufacturing processes may be studied considering the fluid mechanics' principles that describe the transport phenomena for inviscid, continuous, and incompressible laminar flows in order to obtain theoretical results approximated to the process conditions. In this sense, the numerical modeling techniques applied in the analysis of water jet cutting processes define an efficient solution of the processes due to the physical analysis of the partial differential equations, which quantify the abrasive flow particles into the system. Taking into account the above, this research proposes a numerical analysis of the physical phenomena through the two-phase flow simulation in steady state with OpenFOAM. Abrasive and liquid phases are quantified to study the turbulent values, which describe the water jet behavior under different working conditions. A 2D model has been computed and discretized, considering the nozzle features in order to visualize and predict the abrasive mixture and flow rejected by using a low computational effort. Therefore, this numerical approach has been validated with a mesh independency analysis developed to verify the relation between the numerical data and the finite number of nodes computed in order to discretize a computational domain and to solve analytically the system proposed until reaching a high approximation between the model and the experimental values obtained during the cutting process by means of abrasive flows.

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Operational Failure Detection Applied to Heat Exchange Systems Using State Observer Method
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Rojas Suárez, Jhan Piero | 2021

The role of computational modeling is becoming predominant in the exploration and evaluation of new technologies. Numerical simulations have solved the most complex phenomena immersed in thermal sciences by the implementation of sophisticated mathematical algorithms. This study incorporates a stationary thermodynamic model in order to evaluate the main operational parameters and the overall performance of heat exchange systems based on energy and exergy viewpoints while implementing unknown inputs. Moreover, the study introduces a UIO state observer technology in order to facilitate the early prediction of failure events in heat exchange systems using a detect, isolate and identify (FDI) methodology. Therefore, the proposed model has induced different fault conditions in order to examine the overall performance while integrating error state of signals criteria from the relative difference between the real and modeled estimates. The outcomes have demonstrated a good agreement for the estimated values of the mathematical algorithm considering the imminent presence of disturbance and interference that promotes modeling error. Finally, the results have outlined that the estimations of real operation conditions are not affected by the unknown inputs.

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Browsing Infraestructura Vial - GIVIAL by Author "ddf5c56fad665148eaacb953bbe77785"

2D Simulation of Two-Phase Flow for Water Jet Cutting Processes with OpenFOAM

Operational Failure Detection Applied to Heat Exchange Systems Using State Observer Method

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2D Simulation of Two-Phase Flow for Water Jet Cutting Processes with OpenFOAM

Operational Failure Detection Applied to Heat Exchange Systems Using State Observer Method

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Browsing Infraestructura Vial - GIVIAL by Author "ddf5c56fad665148eaacb953bbe77785"

2D Simulation of Two-Phase Flow for Water Jet Cutting Processes with OpenFOAM ﻿

Operational Failure Detection Applied to Heat Exchange Systems Using State Observer Method ﻿

Envíos recientes

2D Simulation of Two-Phase Flow for Water Jet Cutting Processes with OpenFOAM

Operational Failure Detection Applied to Heat Exchange Systems Using State Observer Method

Portales Institucionales

2D Simulation of Two-Phase Flow for Water Jet Cutting Processes with OpenFOAM

Operational Failure Detection Applied to Heat Exchange Systems Using State Observer Method