Self-Organizing Hybrid Cartesian Grid Generation and Application to External and Internal Flow Problems

Deister, Frank; Waymel, Frédéric; Hirschel, Ernst Heinrich; Monnoyer, F.

doi:10.1007/978-3-540-45693-3_2

Cited by 6 publications

(7 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In order to prevent numerical oscillations, which may occur in regions with strong gradients, the minmod limiter was used. The spatial discretization was performed with an automatic Cartesian grid generator [9].…”

Section: The Numerical Solvermentioning

confidence: 99%

Numerical and reduced-scale experimental investigation of blast wave shape in underground transportation infrastructure

Pennetier

William-Louis

Langlet

2015

Process Safety and Environmental Protection

View full text Add to dashboard Cite

When an explosion occurs in a tunnel, the study of the blast wave quickly becomes complicated, owing to the multiple propagation patterns of the blast wave (Incident wave, regular and Mach reections) and to the geometrical conditions. Considering this problem, two patterns can be revealed. Near the explosive, the well known freeeld pressure wave can be observed. After multiple reections on the tunnel's walls, this overpressure behaves like a one-dimensional (1D) wave. One aim of this paper is to determine the position of this transition spherical-to-planar wave propagation in a tunnel using both numerical and reduced-scale experiments, and thereby validate the dedicated law established in a previous work.For this purpose, a detonation of TNT in a tunnel with a cross-section of up to 55 m 2 is considered. Results show good agreement between the numerical simulations and experiments. The transition zone between the three-dimensional (3D) and the 1D wave is well detected. An application to a simplied subway station is also investigated which shows that signicant planar waves can be transmitted to the neighboring stations via the junction tunnels.

show abstract

Section: The Numerical Solvermentioning

confidence: 99%

Numerical and reduced-scale experimental investigation of blast wave shape in underground transportation infrastructure

Pennetier

William-Louis

Langlet

2015

Process Safety and Environmental Protection

View full text Add to dashboard Cite

show abstract

“…With this approach, there is no need to regenerate 5 the mesh and the length of the sliding domain can be kept constant. Both sub-domains are independently meshed by means of an automatic Cartesian mesh generator [13] based on a boundary triangular mesh. The grid generator relies directly on an octree structure.…”

Section: Calculation Domainmentioning

confidence: 99%

“…The grid generator relies directly on an octree structure. The boundary cells are truncated and a merging procedure allows to avoid the convergence problem caused by small cells (see [13] for all details). Both sub-domains are connected to each other at common interfaces where a reconstruction of the cells faces is made on each side to preserve the conservative properties of the numerical scheme.…”

Section: Calculation Domainmentioning

confidence: 99%

Efficient 3D numerical prediction of the pressure wave generated by high-speed trains entering tunnels

et al. 2011

View full text Add to dashboard Cite

show abstract

“…The space discretization is performed by an automatic Cartesian grid generator, which takes the exact model geometry into account [15]. In order to avoid contiguous cells with a too-small volume ratio, the smooth octree structure and merging processes are also included [13].…”

Section: The Numerical Methodsmentioning

confidence: 99%

“…The smaller α, the higher the level of damage. In the case of a rigid-perfectly plastic response of the element (i.e., α < 1 and q m ≫ 1), solving the ordinary differential system (15)(16) gives the following iso-damage curves equation [10]:…”

Section: Pressure-impulse Diagrams For the Single-degree-of-freedom Mmentioning

confidence: 99%

Prediction of blast wave effects on a developed site

Benselama

William-Louis

Monnoyer

2010

International Journal of Impact Engineering

View full text Add to dashboard Cite

The guidelines for protecting against and mitigating explosion hazards require knowledge and either the experimental or theoretical evaluation of blast wave parameters. To this end, this article proposes a numerical method for simulating blast wave propagation in complex geometries. This method permits an on-the-ground TNT-like explosion and the subsequent blast wave to be simulated, with the possibility of modifying the ground topology by adding a number of obstacles. The numerical model is explored from both a qualitative and quantitative point of view by comparing it to experimental data, with a correct determination of the wave amplitude and phase signature at different key-positions. The pressure and Mach number distributions deduced from simulations in complex congested areas highlight various fluidsolid interactions, such as regular reflections and diffractions. The iso-damage diagrams of different obstacle layouts are also presented and discussed.Key words: Blast loading, Semi-confined environment, Iso-damage diagram, Finite volume method, Cartesian mesh PACS: 47.40. Rs, 62.20 .D- NomenclatureGreek Symbols ∆p overpressure, ∆p = p − p ref (P a) ∆x specific length of the current three-dimensional mesh cell γ heat capacity ratio of the perfect gas * Corresponding author.

show abstract

Self-Organizing Hybrid Cartesian Grid Generation and Application to External and Internal Flow Problems

Cited by 6 publications

References 2 publications

Numerical and reduced-scale experimental investigation of blast wave shape in underground transportation infrastructure

Numerical and reduced-scale experimental investigation of blast wave shape in underground transportation infrastructure

Efficient 3D numerical prediction of the pressure wave generated by high-speed trains entering tunnels

Prediction of blast wave effects on a developed site

Contact Info

Product

Resources

About