A Modified Anisotropic Perfectly Matcheed Layer Absorbing Boundary Condition for the Time Domain Analysis of Nonlinear and Dispersion Media

2002 ◽  
Author(s):  
Masafumi Fujii ◽  
Peter Russer
Keyword(s):  
Boundary Condition ◽  
Time Domain ◽  
Time Domain Analysis ◽  
Domain Analysis ◽  
Absorbing Boundary Condition ◽  
Absorbing Boundary ◽  
Dispersion Media ◽  
The Time Domain

scholarly journals Reciprocal absorbing boundary condition for the time-domain numerical analysis of wave motion in unbounded layered media

2017 ◽  
Vol 473 (2199) ◽  
pp. 20160528 ◽  
Author(s):  
Cuong T. Nguyen ◽  
John L. Tassoulas
Keyword(s):  
Boundary Condition ◽  
Numerical Analysis ◽  
Time Domain ◽  
Wave Motion ◽  
Layered Media ◽  
Reciprocity Theorem ◽  
Absorbing Boundary Condition ◽  
Absorbing Boundary ◽  
Viscoelastic Media ◽  
The Time Domain

A global absorbing boundary condition is introduced for the time-domain numerical analysis of wave motion in unbounded layered media. This condition is obtained by applying the reciprocity theorem for linearly viscoelastic media. Example problems are solved towards evaluation of the accuracy and effectiveness of the approach developed in this work.

On the Parallelization of a Harmonic Balance Compressible Navier-Stokes Solver for Wind Turbine Aerodynamics

2011 ◽  
Author(s):  
Adrian Jackson ◽  
M. Sergio Campobasso ◽  
Mohammad H. Baba-Ahmadi
Keyword(s):  
Flow Field ◽  
Domain Decomposition ◽  
Wind Turbine ◽  
Time Domain ◽  
Harmonic Balance ◽  
Unsteady Aerodynamics ◽  
Time Domain Analysis ◽  
Domain Analysis ◽  
Navier Stokes ◽  
The Time Domain

The paper discusses the parallelization of a novel explicit harmonic balance Navier-Stokes solver for wind turbine unsteady aerodynamics. For large three-dimensional problems, the use of a standard MPI parallelization based on the geometric domain decomposition of the physical domain may require an excessive degree of partitioning with respect to that needed when the same aerodynamic analysis is performed with the time-domain solver. This occurrence may penalize the parallel efficiency of the harmonic balance solver due to excessive communication among MPI processes to transfer halo data. In the case of the harmonic balance analysis, the necessity of further grid partitioning may arise because the memory requirement of each block is higher than for the time-domain analysis: it is that of the time-domain analysis multiplied by a variable proportional to the number of complex harmonics used to represent the sought periodic flow field. A hybrid multi-level parallelization paradigm for explicit harmonic balance Navier-Stokes solvers is presented, which makes use of both distributed and shared memory parallelization technologies, and removes the need for further domain decomposition with respect to the case of the time-domain analysis. The discussed parallelization approaches are tested on the multigrid harmonic balance solver being developed by the authors, considering various computational configurations for the CFD analysis of the unsteady flow field past the airfoil of a wind tubine blade in yawed wind.

scholarly journals THE TIME DOMAIN ANALYSIS ON MOORED SHIP MOTIONS

1988 ◽  
Vol 1 (21) ◽  
pp. 219 ◽  
Author(s):  
Masayoshi Kubo ◽  
Naokatsu Shimoda ◽  
Shunsaku Okamoto
Keyword(s):  
Time Domain ◽  
Integral Method ◽  
Time Domain Analysis ◽  
Domain Analysis ◽  
Ship Motions ◽  
Convolution Integral ◽  
Quay Wall ◽  
Calculation Results ◽  
The Time Domain

The ship refuge inside a harbor in storm requires the analysis of moored ship motions along a quay wall. In this case the time domain analysis with the convolution integral method becomes effective. But the calculation accuracy is not enough and must be improved to analyze actual moored ship motions. In this paper some methods of the improvement are proposed and their efficiency is verified by comparing the calculation results with the experimental ones.

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