Hydrogen-Oxygen detonation

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Video in TIB AV-Portal: Hydrogen-Oxygen detonation

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Hydrogen-Oxygen detonation
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The underlying physical experiment consists of a tube filled with hydrogen and oxygen. Both react and build a detonation front, moving to the right. The mathematical model consists of the compressible Euler equations with reactive source terms. They are solved by a finite volume scheme on an unstructured grid. Next to the detonation front the grid is locally refined and the refinement zone is moving with the front. Different geometries (e.g. with obstacles inside) of the tube are considered.
Keywords reactive Euler equations reactive flow Detonation local grid refinement dynamical grid refinement conservation laws Computational fluid mechanics
Ocean current Finite element method Wave Model theory Numerical analysis
Mixture model Wave Population density Matching (graph theory) Pressure Time domain Product (business)
Area Time zone Group action Population density Matching (graph theory) Vapor barrier
Complex (psychology) Vapor barrier Mass flow rate Closed set 19 (number)
Radical (chemistry) Mechanism design Loop (music) Observational study Pi Concentric Water vapor Numerical analysis Theory
Pairwise comparison Food energy Resultant
the room
and the simulation of the unstable behavior of detonation waves is a
challenging subject of current research this simulation models the detonation of an
arbitrary unburned gas mixture this simple example already indicates the characteristic features we have to deal with the fall clippings of the domain show that dynamical the adapted match the reactant and the product of the chemical reaction the density of the pressure
everything else being the same the detonation wave now it's a cascade of
barriers the find areas of the adaptive matched smart yellow the allocated at the shop patterns that appear in the density below things the about chart compares the numerical cost of the displayed simulation with the cost of eviction should simulation based on uniformly refined match the the the a closer
look at the density and the reaction zone between burned and unburned gas we observe the transition from a detonation to deflagration behind the 1st variant I'm the the the
applying the new visualization approach of texture transport we can analyze the complex time-dependent flow we see in the above of the flow in the whole channel the lower a close up inside the cascade of barriers that an that we the other just looking at the end the next
simulation of a hydrogen oxygen detonation with the detailed reaction
mechanism involves not molecules
in the theory of elementary reactions and in general the simulations as realistic reactive loop problems a very demanding of only modern numerical methods allow numerical studies of such phenomena the pictures from above show the adaptive matched repression or the concentration of hydrogen or water and hydrogen radical and their release chemical energy their release chemical
energy updated step by step displays the typical detonation cells this pattern can also be observed in experiments and the quantitative
comparison with the small 1 strain of suggests that the simulation is able to reproduce the experimental results the I