Untitled

Birkby, P; Cant, RS; Savill, A. M.

doi:10.1023/a:1009932203310

Cited by 8 publications

(1 citation statement)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thanks to the improvements in computational technology and resources, CFD is becoming a more attractive and reliable tool as an alternative to experiments in process industries. Reynolds-averaged Navier-Stokes M a n u s c r i p t (RANS) methods have been applied in studying explosions for safety-related structures (Birkby et al, 2000;Catlin et al, 1995;Popat et al, 1996). While RANS-based method remains as the major numerical tool in explosion-related studies, the accuracy is generally not sufficient and a certain degree of tuning of model parameters is usually required.…”

Section: Introductionmentioning

confidence: 99%

On the mechanism of pressure rise in vented explosions: A numerical study

Malalasekera

Ibrahim

et al. 2018

Process Safety and Environmental Protection

View full text Add to dashboard Cite

Accidental gas explosions are a significant concern in process industries. In an explosion event, the promotion of flame acceleration due to turbulence generated from obstacles is responsible for many severe damages. This paper discusses the numerical evaluation and the mechanism of pressure rise in vented explosions in the presence of obstructions using computational fluid dynamics (CFD). The large eddy simulation (LES) technique is employed with a dynamic flame surface density (DFSD) in the combustion model to account for the filtered chemical source term. The experimental test case considered for the validation of simulations is a smallscale explosion chamber with removable baffle plates and obstacles. It is found that the maximum overpressure increases with the baffle plates moved downstream from the ignition source or when additional baffles are placed in sequence. Large separation between baffles and the central obstacle results in lower overpressure due to the relaminarisation of the flame front. The trend of explosion overpressure is related to the competition between the strength of venting and expansion in the explosion chamber. Extensive interactions between the flame and the obstructiongenerated turbulence are found to wrinkle the flame front and increase the burning rate. Satisfactory agreements have been obtained between LES and the experimental data. This confirms the capability of the developed model in predicting essential safety-related parameters in vented explosions. Results reveal the potential of using LES in the selection of design aspects for loss prevention, such as the area of vents and distance between congested regions in chemical processing plants.

show abstract

Section: Introductionmentioning

confidence: 99%

On the mechanism of pressure rise in vented explosions: A numerical study

Malalasekera

Ibrahim

et al. 2018

Process Safety and Environmental Protection

View full text Add to dashboard Cite

show abstract

Godunov‐type adaptive grid model of wave–current interaction at cuspate beaches

Rogers

Borthwick

Taylor

2004

Numerical Methods in Fluids

View full text Add to dashboard Cite

SUMMARYThis paper presents a second-order accurate Godunov-type numerical scheme for depth-and periodaveraged wave-current interaction. A ux Jacobian is derived for the wave conservation equations and its eigensystem determined, enabling Roe's approximate Riemann solver to be used to evaluate convective uxes. Dynamically adaptive quadtree grids are used to focus on local hydrodynamic features, where sharp gradients occur in the ow variables. Adaptation criteria based on depth-averaged vorticity, waveheight gradient, wave steepness and the magnitude of velocity gradients are found to produce accurate solutions for nearshore circulation at a half-sinusoidal beach. However, the simultaneous combination of two or more separate criteria produces numerical instability and interference unless all criteria are satisÿed for mesh depletion. Simulations of wave-current interaction at a multi-cusped beach match laboratory data from the United Kingdom Coastal Research Facility (UKCRF). A parameter study demonstrates the sensitivity of nearshore ow patterns to changes in relative cusp height, angle of wave incidence, bed roughness, o shore wave height and assumed turbulent eddy viscosity. Only a small deviation from normal wave incidence is required to initiate a meandering longshore current. Nearshore circulation patterns are highly dependent on the o shore wave height. Reduction of the assumed eddy viscosity parameter causes the primary circulation cells for normally incident waves to increase in strength whilst producing rip-like currents cutting diagonally across the surf zone.

show abstract

Modified porosity approach and laminar flamelet modelling for advanced simulation of accidental explosions

Vianna

Cant

2010

Journal of Loss Prevention in the Process Industries

View full text Add to dashboard Cite

Untitled

Cited by 8 publications

References 21 publications

On the mechanism of pressure rise in vented explosions: A numerical study

On the mechanism of pressure rise in vented explosions: A numerical study

Godunov‐type adaptive grid model of wave–current interaction at cuspate beaches

Modified porosity approach and laminar flamelet modelling for advanced simulation of accidental explosions

Contact Info

Product

Resources

About