Use of OpenFOAM coupled with a Hybridization of Finite Element-Boundary Element Methods using an Adaptive Absorbing Boundary Condition for Wind Noise Simulation

2017 ◽  
Author(s):  
Nicolas Zerbib ◽  
Andrew Heather ◽  
David Mas ◽  
Lassen Mebarek
Keyword(s):  
Boundary Condition ◽  
Finite Element ◽  
Boundary Element ◽  
Boundary Element Methods ◽  
Absorbing Boundary Condition ◽  
Wind Noise ◽  
Absorbing Boundary ◽  
Noise Simulation ◽  
Element Boundary

scholarly journals Implementation of Isogeometric Fast Multipole Boundary Element Methods for 2D Half-Space Acoustic Scattering Problems with Absorbing Boundary Condition

2019 ◽  
Vol 27 (02) ◽  
pp. 1850024 ◽  
Author(s):  
Leilei Chen ◽  
Steffen Marburg ◽  
Wenchang Zhao ◽  
Cheng Liu ◽  
Haibo Chen
Keyword(s):  
Boundary Condition ◽  
Boundary Element Method ◽  
Boundary Element ◽  
Half Space ◽  
Boundary Element Methods ◽  
Absorbing Boundary Condition ◽  
Fast Multipole ◽  
Absorbing Boundary ◽  
Computer Aided ◽  
Element Method

Isogeometric Analysis (IGA), which tries to bridge the gap between Computer Aided Engineering (CAE) and Computer Aided Design (CAD), has been widely proposed in recent research. According to the concept of IGA, this work develops a boundary element method (BEM) using non-Uniform Rational B-Splines (NURBS) as basis functions for the 2D half-space acoustic problems with absorbing boundary condition. Fast multipole method (FMM) is applied to accelerate the solution of an isogeometric BEM (IGA-BEM). Several examples are tested and it is shown that this advancement on isogeometric fast multipole boundary element method improves the accuracy of simulations.

Parameter Identification with FEM on Absorbing Boundary Condition and Genetic Algorithm (GA)

2011 ◽  
Vol 52-54 ◽  
pp. 850-853 ◽  
Author(s):  
Jian Mei Chang ◽  
Huai Ping Feng
Keyword(s):  
Boundary Condition ◽  
Finite Element ◽  
Finite Element Model ◽  
Radiation Condition ◽  
Element Model ◽  
Global Optimum ◽  
Forward Problem ◽  
Absorbing Boundary Condition ◽  
Absorbing Boundary ◽  
Backward Problem

Researches of wave motion are important on theory and application. The forward problem and the backward problem are the two aspects that relate with each other. In this paper, with the combination of FEM considering BGT absorbing boundary condition for forward problem and GA method, the inversion of target’s characters in infinite area is discussed. The absorbing boundary condition is obtained through approximating the Sommerfeld radiation condition. Although the absorbing boundary condition can’t simulate the effect exactly, it can reach the limitation in the practice and has the character of solving the coupling that simplifies the calculations. Because of the use of finite element model method, the forward problems that involve special geometrical shaped scatter and multi scatters can be solved. The finite element model is used iteratively to compute the scattered field. In the inversion process, the GA method is adopted because of its advantage of global optimum search and parallel calculation. The numerical simulation examples of single and multiple show the validity of this method.

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