Numerical Simulation of Detonation Initiation: The Quest of Grid Resolution

2020 ◽  
pp. 79-89
Author(s):  
Alexander I. Lopato ◽  
Artem G. Eremenko ◽  
Pavel S. Utkin ◽  
Dmitry A. Gavrilov
Keyword(s):  
Numerical Simulation ◽  
Detonation Initiation ◽  
Grid Resolution

Lattice Boltzmann for Turbulent Flows

2018 ◽  
Author(s):  
Sauro Succi
Keyword(s):  
Numerical Simulation ◽  
Direct Numerical Simulation ◽  
Turbulent Flows ◽  
Lattice Boltzmann ◽  
Turbulence Modeling ◽  
Grid Resolution ◽  
Subsequent Chapter ◽  
Main Ideas

This chapter presents the main ideas behind the application of LB methods to the simulation of turbulent flows. The attention is restricted to the case of direct numerical simulation, in which all scales of motion within the grid resolution are retained in the simulation. Turbulence modeling, in which the effect of unresolved scales on the resolved ones is taken into account by various forms of modeling, will be treated in a subsequent chapter.

scholarly journals Numerical simulation of detonation initiation of combustible gases.

1986 ◽  
Vol 52 (483) ◽  
pp. 3712-3717
Author(s):  
Shigeharu OHYAGI ◽  
Teruo YOSHIHASHI ◽  
Yasuo HARIGAYA
Keyword(s):  
Numerical Simulation ◽  
Detonation Initiation ◽  
Combustible Gases

scholarly journals Numerical Simulation of Hot Jet Detonation with Different Ignition Positions

2019 ◽  
Vol 9 (21) ◽  
pp. 4607 ◽  
Author(s):  
Zheng ◽  
Liu ◽  
Zhao ◽  
Chen ◽  
Jia ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Detonation Wave ◽  
Energy Release ◽  
Detonation Initiation ◽  
Navier Stokes ◽  
Jet Formation ◽  
Jet Flame ◽  
Numerical Studies ◽  
Detonation Transition ◽  
Accelerating Energy Release

Ignition position is an important factor affecting flame propagation and deflagration-to-detonation transition (DDT). In this study, 2D reactive Navier–Stokes numerical studies have been performed to investigate the effects of ignition position on hot jet detonation initiation. Through the stages of hot jet formation, vortex-flame interaction and detonation wave formation, the mechanism of the hot jet detonation initiation is analyzed in detail. The results indicate that the vortexes formed by hot jet entrain flame to increase the flame area rapidly, thus accelerating energy release and the formation of the detonation wave. With changing the ignition position from top to wall inside the hot jet tube, the faster velocity of hot jet will promote the vortex to entrain jet flame earlier, and the DDT time and distance will decrease. In addition, the effect of different wall ignition positions (from 0 mm to 150 mm away from top of hot jet tube) on DDT is also studied. When the ignition source is 30 mm away from the top of hot jet tube, the distance to initiate detonation wave is the shortest due to the highest jet intensity, the DDT time and distance are about 41.45% and 30.77% less than the top ignition.

Computational Investigation of Full-Scale Tethered Underwater Kite

2018 ◽  
Author(s):  
Amirmahdi Ghasemi ◽  
David J. Olinger ◽  
Gretar Tryggvason
Keyword(s):  
Numerical Simulation ◽  
Stokes Equations ◽  
Three Dimensional ◽  
Simulation Models ◽  
Slip Boundary Condition ◽  
Full Scale ◽  
Grid Resolution ◽  
Ocean Current ◽  
Computational Domain ◽  
Fixed Structure

In this paper, a numerical simulation of three-dimensional motion of tether undersea kites (TUSK) for power generation is studied. TUSK systems includes a rigid-winged kite, or glider, moving in an ocean current in which a tethered kite is connected by a flexible tether to a fixed structure. Kite hydrodynamic forces are transmitted through the tether to an electrical generator on the fixed structure. The numerical simulation models the flow field in a three-dimensional domain near the rigid undersea kite wing by solving the full Navier-Stokes equations. In order to resolve the boundary layer near the kite surface, adequate grid resolution is needed which increases the computational run time drastically especially in 3D simulations. Therefore, in this study a slip boundary condition is implemented at the kite interface to accurately predict the total drag, with lower grid resolution. In order to reduce the numerical run times, a moving computational domain method is also used. A PID controller is used to adjuste the kite pitch, roll and yaw angles during power (tether reel-out) and retraction (reel-in) phases. A baseline simulation study of a full-scale TUSK system is conducted in which the expected cross-current, figure-8 motions during a kite reel-out phase is captured. The effect of the tether drag on the kite motion and resulting power output is also investigated and compared with the results of the baseline simulation.

Numerical simulation of detonation initiation in a contoured tube

2009 ◽  
Vol 45 (6) ◽  
pp. 700-707 ◽  
Author(s):  
I. V. Semenov ◽  
P. S. Utkin ◽  
V. V. Markov
Keyword(s):  
Numerical Simulation ◽  
Detonation Initiation

Numerical simulation of detonation initiation in a flame brush: the role of hot spots

1999 ◽  
Vol 119 (4) ◽  
pp. 400-416 ◽  
Author(s):  
Alexei M. Khokhlov ◽  
Elaine S. Oran
Keyword(s):  
Numerical Simulation ◽  
Hot Spots ◽  
Detonation Initiation ◽  
Flame Brush

Adaptive Mesh Refinement–Based Numerical Simulation of Detonation Initiation in Supersonic Combustible Mixtures Using a Hot Jet

2015 ◽  
Vol 28 (1) ◽  
pp. 04014046 ◽  
Author(s):  
Xiaodong Cai ◽  
Jianhan Liang ◽  
Zhiyong Lin ◽  
Ralf Deiterding ◽  
Hui Qin ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Adaptive Mesh Refinement ◽  
Mesh Refinement ◽  
Adaptive Mesh ◽  
Detonation Initiation ◽  
Combustible Mixtures
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