Analysis of transient wave propagation dynamics using the enriched finite element method with interpolation cover functions

Chai, Yingbin; Li, Wei; Liu, Zuyuan

doi:10.1016/j.amc.2021.126564

Cited by 46 publications

(36 citation statements)

References 65 publications

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“…As we all know, the main numerical methods to study acoustic radiation and scattering are the finite element method (FEM) [1][2][3][4] and the boundary element method (BEM) [5][6][7]. The FEM is a general method for solving mathematical and physical equations.…”

Section: Introductionmentioning

confidence: 99%

A Modified Formulation of Singular Boundary Method for Exterior Acoustics

Wu¹,

Fu²,

Min³

2023

Computer Modeling in Engineering &Amp; Sciences

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This paper proposes a modified formulation of the singular boundary method (SBM) by introducing the combined Helmholtz integral equation formulation (CHIEF) and the self-regularization technique to exterior acoustics. In the SBM, the concept of the origin intensity factor (OIF) is introduced to avoid the singularities of the fundamental solutions. The SBM belongs to the meshless boundary collocation methods. The additional use of the CHIEF scheme and the self-regularization technique in the SBM guarantees the unique solution of the exterior acoustics accurately and efficiently. Consequently, by using the SBM coupled with the CHIEF scheme and the self-regularization technique, the accuracy of the numerical solution can be improved, especially near the corresponding internal characteristic frequencies. Several numerical examples of two-dimensional and threedimensional benchmark examples about exterior acoustics are used to verify the effectiveness and accuracy of the proposed method. The proposed numerical results are compared with the analytical solutions and the solutions obtained by the other numerical methods.

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Section: Introductionmentioning

confidence: 99%

A Modified Formulation of Singular Boundary Method for Exterior Acoustics

Wu¹,

Fu²,

Min³

2023

Computer Modeling in Engineering &Amp; Sciences

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“…In this study, the 2D steady-state seepage analysis of the embankment dam body and its base will be examined by the FEM. As it is known, the FEM is a numerical method used in the solution of engineering problems, especially in recent years, due to its many advantages [25][26][27][28][29]. e main purpose of this paper is to demonstrate the eff ective and easy usability of the FEM based on Galerkin's element approach in seepage problems in isotropic and anisotropic soil mediums.…”

Section: Introductionmentioning

confidence: 99%

Finite element analysis of the seepage problem in the dam body and foundation based on the Galerkin’s approach

Aslan

Temel

2022

European Mechanical Science

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In this study, the 2D steady-state seepage analysis of the dam body and its base is investigated using the finite element method based on the Galerkin’s approach. The body and foundation soil are considered as homogeneous isotropic and anisotropic materials and the effects of horizontal drainage length and cutoff wall on seepage are investigated. The differential equation governing the response of water in the soil is obtained with the help of Darcy's law and continuity equations. A program has been prepared in Fortran programming language to find the hydraulic load, pressure values and phreatic line pressure values at the points inside the dam body and the quantity of seepage on the bottom of dam. It has been shown that the obtained values are in good agreement by comparing them with the results of existing studies in the literature.

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“…Applying skin temperature to the design and control of HVAC system parameters was beneficial to improving thermal comfort and reducing energy consumption. Qi et al [14] conducted experimental studies on the dynamic thermal environment of an automobile cabin and the local thermal sensations of front and rear occupants at different driving states in summer with air conditioning running. The results showed that the air temperature, occupant skin temperature, and local thermal sensations were all affected by occupant position, body part, and driving state.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Manned/Unmanned Thermal Environment in Radar Electronic Shelter Based on Different Air Supply Conditions

Guo

Xue

et al. 2022

Energies

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Studies on the thermal environment of the electronic radar shelter have been mainly focused on the simulation of the unmanned thermal environment, and there have been few studies on experiments in the thermal environment. Additionally, a comparative study of the experimental results from manned and unmanned shelters has been missing. In this paper, we experimented in thermal environments of manned/unmanned shelter under different air supply conditions. The experiment was divided into cooled, ventilated, and heated trials analyzing three aspects: (1) The average temperature distributions of walls, air inlet points, air outlet points, and surfaces were measured over time under different conditions in an unmanned shelter. The temperature distribution curve was fitted into the function. (2) Based on different working conditions, the temperature distribution experiments were carried out in three different areas for subjects wearing short or long clothing respectively. (3) The wind speed was measured at each measuring point in the air supply pipeline under different working conditions. The wind speed distribution was detected on the setting surfaces. The experimental results show that: (1) The air does not gradually tend to steady state with the time, and under different conditions, the air temperature obviously differs. (2) The clothing selection, air supply conditions, and locations of measuring points have significant influences on human body temperature distribution and left–right difference. (3) The mixing of the thermal plume caused by the vertical temperature difference of the human body and the jet generated by the mechanical air supply will reduce the wind speed of the airflow in the cabin, the adsorption of the jet to the bulkhead, and the stability of the airflow. The experimental data can provide the initial and boundary conditions for the simulation of the shelter. The results can provide a reference for the study of fluid control methods, the setting of thermal boundary conditions, and the simulation of the influence of thermal plumes on the airflow distribution. The experimental study in this paper has filled in the blanks regarding experimental study in electronic radar shelters. It has important research value and practical significance.

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Analysis of transient wave propagation dynamics using the enriched finite element method with interpolation cover functions

Cited by 46 publications

References 65 publications

A Modified Formulation of Singular Boundary Method for Exterior Acoustics

A Modified Formulation of Singular Boundary Method for Exterior Acoustics

Finite element analysis of the seepage problem in the dam body and foundation based on the Galerkin’s approach

Experimental Study on Manned/Unmanned Thermal Environment in Radar Electronic Shelter Based on Different Air Supply Conditions

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