scholarly journals 1003 Treatment of rigid boundary conditions in SPH : 2^ report : In case of compressible flow

2007 ◽  
Vol 2007.20 (0) ◽  
pp. 467-468
Author(s):  
Akinori KOYAMA ◽  
Haruki OBARA ◽  
Daisuke TAKA
Keyword(s):  
Boundary Conditions ◽  
Compressible Flow ◽  
Rigid Boundary

Seismic Response Analysis of Twin-Tower Building with Enlarged Base

2014 ◽  
Vol 912-914 ◽  
pp. 1534-1537
Author(s):  
Shao Bo Zhang ◽  
Ke Lun Wei ◽  
Bi Jian Xiao
Keyword(s):  
Finite Element ◽  
Dynamic Response ◽  
Boundary Conditions ◽  
Seismic Response ◽  
Time History ◽  
Response Analysis ◽  
Rigid Boundary ◽  
Finite Element Software ◽  
Elastic Boundary ◽  
Elastic Boundary Conditions

This paper adopts large finite element software ANSYS to establish finite element model of twin-tower building with enlarged base, uses dynamic time history analysis method for seismic response calculation, compare and analyze the calculation results of twin-tower building with enlarged base under elastic boundary conditions and rigid boundary conditions. The results showe that dynamic response for model under elastic boundary conditions is larger than dynamic response for model under rigid boundary conditions, and elastic boundary conditions is more close to the actual situation.

Effect of fully blocked non-rigid boundary conditions on detonation wave

2018 ◽  
Vol 116 ◽  
pp. 52-60 ◽  
Author(s):  
Qingwei Guan ◽  
Wentao Ji ◽  
Xingqing Yan ◽  
Jianliang Yu ◽  
Futong Yao ◽  
...  
Keyword(s):  
Detonation Wave ◽  
Boundary Conditions ◽  
Rigid Boundary

scholarly journals Verification Assessment of Piston Boundary Conditions for Lagrangian Simulation of Compressible Flow Similarity Solutions

2015 ◽  
Vol 1 (2) ◽  
Author(s):  
Scott D. Ramsey ◽  
Philip R. Ivancic ◽  
Jennifer F. Lilieholm
Keyword(s):  
Shock Wave ◽  
Wave Propagation ◽  
Boundary Conditions ◽  
Closed Form ◽  
Compressible Flow ◽  
Similarity Solutions ◽  
Test Problems ◽  
Closed Form Solutions ◽  
Self Similar ◽  
Temporal Extent

This work is concerned with the use of similarity solutions of the compressible flow equations as benchmarks or verification test problems for finite-volume compressible flow simulation software. In practice, this effort can be complicated by the infinite spatial/temporal extent of many candidate solutions or “test problems.” Methods can be devised with the intention of ameliorating this inconsistency with the finite nature of computational simulation; the exact strategy will depend on the code and problem archetypes under investigation. For example, self-similar shock wave propagation can be represented in Lagrangian compressible flow simulations as rigid boundary-driven flow, even if no such “piston” is present in the counterpart mathematical similarity solution. The purpose of this work is to investigate in detail the methodology of representing self-similar shock wave propagation as a piston-driven flow in the context of various test problems featuring simple closed-form solutions of infinite spatial/temporal extent. The closed-form solutions allow for the derivation of similarly closed-form piston boundary conditions (BCs) for use in Lagrangian compressible flow solvers. The consequences of utilizing these BCs (as opposed to directly initializing the self-similar solution in a computational spatial grid) are investigated in terms of common code verification analysis metrics (e.g., shock strength/position errors and global convergence rates).

Dislocation Dynamics Simulations

2012 ◽  
Vol 736 ◽  
pp. 13-20 ◽  
Author(s):  
Karri V. Mani Krishna ◽  
Prita Pant
Keyword(s):  
Boundary Conditions ◽  
Strain Hardening ◽  
Deformation Behaviour ◽  
Dislocation Dynamics ◽  
Clear Correlation ◽  
Rigid Boundary ◽  
Rate Of Increase ◽  
Dislocation Densities ◽  
Dynamics Simulations ◽  
Film Substrate

Dislocation Dynamics (DD) simulations are used to study the evolution of a pre-specified dislocation structure under applied stresses and imposed boundary conditions. These simulations can handle realistic dislocation densities ranging from 1010 to 1014 m-2, and hence can be used to model plastic deformation and strain hardening in metals. In this paper we introduce the basic concepts of DD simulations and then present results from simulations in thin copper films and in bulk zirconium. In both cases, the effect of orientation on deformation behaviour is investigated. For the thin film simulations, rigid boundary conditions are used at film-substrate and film-passivation interfaces leading to dislocation accumulation, while periodic boundaries are used for bulk grains of Zr. We show that there is a clear correlation between strain hardening rate and the rate of increase of dislocation density.

Patch Transfer Functions as a Tool to Couple Linear Acoustic Problems

2004 ◽  
Vol 127 (5) ◽  
pp. 458-466 ◽  
Author(s):  
Morvan Ouisse ◽  
Laurent Maxit ◽  
Christian Cacciolati ◽  
Jean-Louis Guyader
Keyword(s):  
Boundary Conditions ◽  
Strong Coupling ◽  
Transfer Functions ◽  
Acoustic Behavior ◽  
Rigid Boundary ◽  
Mean Values ◽  
Final Assembly ◽  
Coupling Case ◽  
Linear Problems ◽  
Basic Equations

A method to couple acoustic linear problems is presented in this paper. It allows one to consider several acoustic subsystems, coupled through surfaces divided in elementary areas called patches. These subsystems have to be studied independently with any available method, in order to build a database of transfer functions called patch transfer functions, which are defined using mean values on patches, and rigid boundary conditions on the coupling area. A final assembly, using continuity relations, leads to a very quick resolution of the problem. The basic equations are developed, and the acoustic behavior of a cavity separated in two parts is presented, in order to show the ability of the method to study a strong-coupling case. Optimal meshing size of the coupling area is then discussed, some comparisons with experiments are shown, and finally a complex automotive industrial case is presented.

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