SIMULATION STUDY ON NON-HOMOGENOUS SYSTEM OF NON-INVASIVE ERT USING COMSOL MULTIPHYSICS

2015 ◽  
Vol 77 (17) ◽  
Author(s):  
Yasmin Abdul Wahab ◽  
Ruzairi Abdul Rahim ◽  
Mohd Hafiz Fazalul Rahiman ◽  
Leow Pei Ling ◽  
Suzzana Ridzuan Aw ◽  
...  
Keyword(s):  
Finite Element ◽  
Simulation Study ◽  
Direct Contact ◽  
Comsol Multiphysics ◽  
Finite Element Software ◽  
Non Invasive ◽  
System A ◽  
Process Tomography ◽  
Gas Medium ◽  
Air Medium

The non-invasive sensing technique is one of the favourite sensing techniques applied in the process tomography because it has not a direct contact with the medium of interest. The objective of this paper is to analyse the simulation of the non-homogenous system of the non-invasive ERT using finite element software; COMSOL Multiphysics. In this simulation, the liquid-air medium is chosen as the non-homogenous system. A different analysis of the non-homogenous system in term of the different position of the single air, different size of the single air and the multiple air inside the vessel were investigated in this paper. As a result, the location, size and multiple air inside the pipe will influence the output of the non-invasive ERT system. A liquid-gas medium of non-homogenous ERT system will have a good response if the air is located near the source, the size of the air is large enough and it has multiple air locations inside the pipe.

scholarly journals A Compact FEM Implementation for Parabolic Integro-Differential Equations in 2D

Algorithms ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 242
Author(s):  
Gujji Murali Mohan Reddy ◽  
Alan B. Seitenfuss ◽  
Débora de Oliveira Medeiros ◽  
Luca Meacci ◽  
Milton Assunção ◽  
...  
Keyword(s):  
Finite Element ◽  
Differential Equations ◽  
Piecewise Linear ◽  
Time Discretization ◽  
Comsol Multiphysics ◽  
Integral Term ◽  
Finite Element Software ◽  
Time Stepping ◽  
Backward Euler ◽  
Shaped Domain

Although two-dimensional (2D) parabolic integro-differential equations (PIDEs) arise in many physical contexts, there is no generally available software that is able to solve them numerically. To remedy this situation, in this article, we provide a compact implementation for solving 2D PIDEs using the finite element method (FEM) on unstructured grids. Piecewise linear finite element spaces on triangles are used for the space discretization, whereas the time discretization is based on the backward-Euler and the Crank–Nicolson methods. The quadrature rules for discretizing the Volterra integral term are chosen so as to be consistent with the time-stepping schemes; a more efficient version of the implementation that uses a vectorization technique in the assembly process is also presented. The compactness of the approach is demonstrated using the software Matrix Laboratory (MATLAB). The efficiency is demonstrated via a numerical example on an L-shaped domain, for which a comparison is possible against the commercially available finite element software COMSOL Multiphysics. Moreover, further consideration indicates that COMSOL Multiphysics cannot be directly applied to 2D PIDEs containing more complex kernels in the Volterra integral term, whereas our method can. Consequently, the subroutines we present constitute a valuable open and validated resource for solving more general 2D PIDEs.

Numerical Simulation Study on Quasi-Static Fracture Problem of Implicit Methods

2012 ◽  
Vol 170-173 ◽  
pp. 3683-3686
Author(s):  
Qi Ming Yu ◽  
Yu Yang Chen ◽  
Zhi Zhang
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Simulation Study ◽  
Implicit Method ◽  
Implicit Methods ◽  
Finite Element Software ◽  
Static Fracture ◽  
Characteristic Values

Implicit method is one of the most important ways of Finite element method. In this paper, finite element software are used for the CTOD test specimens to simulate the characteristic values, then compared with the experimental data to draw the appropriate conclusions.

Compatible Study on Utilizing Frequency for Non-Invasive Electrical Resistance Tomography Using COMSOL Multiphysics

2015 ◽  
Vol 73 (6) ◽  
Author(s):  
Yasmin Abdul Wahab ◽  
Ruzairi Abdul Rahim ◽  
Mohd Hafiz Fazalul Rahiman ◽  
Leow Pei Ling ◽  
Suzanna Ridzuan Aw ◽  
...  
Keyword(s):  
Electric Fields ◽  
Element Model ◽  
Comsol Multiphysics ◽  
Optimum Frequency ◽  
Non Invasive ◽  
System A ◽  
Process Plant ◽  
Process Plants ◽  
Invasive Techniques ◽  
Total Impedance

Non-invasive techniques are widely applied in process plants compared to other sensing techniques. Due to advantages such as preventing corrosion to the sensor and lengthening the sensor lifespan, this technique is also applied in process tomography such as in non-invasive ERT system. The purpose of this paper is to investigate the compatibility of utilizing frequency for non-invasive ERT systems. Based on quasi-static electric fields, one pair of electrodes is used to simulate the optimum frequency for the system. It was firstly derived using a mathematical equation followed by simulation using finite element model software (COMSOL Multiphysics). Results showed that by simulating several frequencies to the system, a minimum frequency that should be applied is 2 MHz to ensure that the real part of the total impedance is dominant and also to neglect the reactance part of the total impedance for the non-invasive ERT system. Thus, the non-invasive ERT system is an alternative way for the industry in monitoring the performance of process plant.

Flexural Wave Propagation Characteristics of Lattice Sandwich Plates

2013 ◽  
Vol 753-755 ◽  
pp. 857-860 ◽  
Author(s):  
Shu Lang Tao ◽  
Gui Lan Yu ◽  
Zong Jian Yao
Keyword(s):  
Finite Element ◽  
Wave Propagation ◽  
Band Gaps ◽  
Comsol Multiphysics ◽  
Flexural Wave ◽  
Sandwich Plates ◽  
Propagation Characteristics ◽  
Finite Element Software ◽  
Flexural Wave Propagation ◽  
Lattice Pattern

This paper is aimed to study flexural wave propagation characteristics of lattice sandwich plates. Based on Blochs theorem, band structure of flexural wave propagation in the plate is obtained by commercial finite element software Comsol Multiphysics. Meanwhile, frequency response is obtained and its maximum attenuation is exactly corresponding to the band gaps. Finally, effects of lattice pattern on band gaps are introduced.

scholarly journals Continuum modelling of pantographic sheets for out-of-plane bifurcation and vibrational analysis

2017 ◽  
Vol 473 (2207) ◽  
pp. 20170636 ◽  
Author(s):  
I. Giorgio ◽  
N. L. Rizzi ◽  
E. Turco
Keyword(s):  
Finite Element ◽  
Kinetic Energy ◽  
Vibrational Analysis ◽  
Comsol Multiphysics ◽  
Two Dimensional ◽  
Finite Element Software ◽  
Continuum Modelling ◽  
Out Of Plane ◽  
Post Buckling ◽  
Coarse Model

A nonlinear two-dimensional (2D) continuum with a latent internal structure is introduced as a coarse model of a plane network of beams which, in turn, is assumed as a model of a pantographic structure made up by two families of equispaced beams, superimposed and connected by pivots. The deformation measures of the beams of the network and that of the 2D body are introduced and the former are expressed in terms of the latter by making some kinematical assumptions. The expressions for the strain and kinetic energy densities of the network are then introduced and given in terms of the kinematic quantities of the 2D continuum. To account for the modelling abilities of the 2D continuum in the linear range, the eigenmode and eigenfrequencies of a given specimen are determined. The buckling and post-buckling behaviour of the same specimen, subjected to two different loading conditions are analysed as tests in the nonlinear range. The problems have been solved numerically by means of the COMSOL Multiphysics finite element software.

Evaluations of Absorption Materials Applied in the Noise Reduction: Experiment and Simulation

2019 ◽  
Vol 947 ◽  
pp. 125-129
Author(s):  
Y.C. Liu ◽  
Y.C. Huang ◽  
Yun Jhe Tang ◽  
Tzu Hsuan Lei
Keyword(s):  
Finite Element ◽  
Simulation Method ◽  
Comsol Multiphysics ◽  
Airflow Resistance ◽  
Finite Element Software ◽  
Reduction Experiment ◽  
Multiphysics Simulations ◽  
Element Simulation ◽  
Simulation Results ◽  
Good Agreement

This article presents a finite element simulation method for airflow resistance of material to predict the influence of absorption material applied to compressor box. To obtain the real airflow resistance, a measurement system based on the standard ASTM C522-03 was systematically built up and carefully verified. Furthermore, commercial finite element software, COMSOL Multiphysics, was adopted to create the model and execute the simulation with and without absorption material. Results showed that airflow resistance increases with the thickness and the density of the material. This system is quite stable and suited to any material. With the aid of COMSOL Multiphysics simulations, the performance of noise with and without absorption material can be analyzed and compared with experimental results. There was good agreement between experimental and simulation results. Based on absorption material of 15,278 Pa.s/m3 airflow resistance, the noise level outside the compressor box obtained from experiment was around 10 dBA higher than that obtained from simulation.

OUTDOOR TESTS OF A TOWED BOAT MODEL WITH FUEL COMBUSTION IN A BOTTOM CAVITY

2020 ◽  
Author(s):  
S. M. FROLOV ◽  
◽  
S. V. Platonov ◽  
K. A. AVDEEV ◽  
V. S. AKSENOV ◽  
...  
Keyword(s):  
Drag Force ◽  
Direct Contact ◽  
Propulsion System ◽  
Hydrodynamic Drag ◽  
Atmospheric Air ◽  
System A ◽  
Bottom Cavity ◽  
Gas Cavity ◽  
System Power ◽  
Gas Supply

To reduce the hydrodynamic drag force to the movement of the boat, an artificial gas cavity is organized under its bottom. Such a cavity partially insulates the bottom from direct contact with water and provides “gas lubrication” by means of forced supply of atmospheric air or exhaust gases from the main propulsion system. A proper longitudinal and transverse shaping of the gas cavity can significantly (by 20%-30%) reduce the hydrodynamic drag of the boat at low (less than 3%) consumption of the propulsion system power for gas supply.

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