Multi-GPU unsteady 2D flow simulation coupled with a state-to-state chemical kinetics

Tuttafesta, M.; Pascazio, G.; Colonna, G.

doi:10.1016/j.cpc.2016.07.016

Cited by 20 publications

(3 citation statements)

References 28 publications

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“…However, accurately characterizing the degree of thermochemical excitation in the experimental freestream is critical for the correct interpretation of experimental data for blunt and slender body studies as well as scramjet studies, and this concept is well documented in literature [4,[14][15][16][17][18][19]. High fidelity state-to-state (StS) thermochemical nonequilibrium models do exist, though their applications have mainly focused on shock waves and converging-diverging nozzle flows where excellent work has been done [20][21][22][23][24][25][26]. Though, as mentioned earlier, converging-diverging nozzle flows are not relevant to the expansion tunnel.…”

Section: Fig 1 the Expansion Tunnel And Corresponding X-t Diagrammentioning

confidence: 99%

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State-Specific Study of Air in the Expansion Tunnel Nozzle and Test Section

Hao

Wen

2022

AIAA Journal

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Thermochemical nonequilibrium in expansion tunnel nozzles is investigated numerically using a state-to-state description in one-dimension for representative air conditions. Limiting the multi-quantum jumps of VVT transitions to 3 in both N2 and O2 can accurately simulate the nonequilibrium nozzle flow. The reduction of VVT transitions to VT transitions works well. State-to-state modelling of an actual expansion tunnel nozzle condition yielded agreement with the measured static pressure. A study on the influence of different thermochemical excitation in the freestream at the test section shows that the post-shock radiation emissions can differ by more than 50 %. However, the non-Boltzmann distributions in the freestream has no influence. An evaluation of the discrepancy between the twotemperature and state-to-state models shows that the former generally predicts a faster thermochemical relaxation. Furthermore, the state-to-state results indicate that, in general, the molecular species all have a different vibrational temperature.

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Section: Fig 1 the Expansion Tunnel And Corresponding X-t Diagrammentioning

confidence: 99%

“…Frozen Though, it is acknowledged that nozzle flows can be multi-dimensional, as shown in Ref. [24,26].…”

Section: Equilibriummentioning

confidence: 99%

State-Specific Study of Air in the Expansion Tunnel Nozzle and Test Section

Hao

Wen

2022

AIAA Journal

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“…The main drawback of the state-to-state approach is the large number of chemical variables considered, limiting the applications only to 1D geometries [61], with a few exceptions [62,63].…”

Section: H 2 and H 2 /He Processes In Kinetic Modelingmentioning

confidence: 99%

Elementary Processes and Kinetic Modeling for Hydrogen and Helium Plasmas

Celiberto

Capitelli

Colonna

et al. 2017

Atoms

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Abstract:We report cross-sections and rate coefficients for excited states colliding with electrons, heavy particles and walls useful for the description of H 2 /He plasma kinetics under different conditions. In particular, the role of the rotational states in resonant vibrational excitations of the H 2 molecule by electron impact and the calculation of the related cross-sections are illustrated. The theoretical determination of the cross-section for the rovibrational energy exchange and dissociation of H 2 molecule, induced by He atom impact, by using the quasi-classical trajectory method is discussed. Recombination probabilities of H atoms on tungsten and graphite, relevant for the determination of the nascent vibrational distribution, are also presented. An example of a state-to-state plasma kinetic model for the description of shock waves operating in H 2 and He-H 2 mixtures is presented, emphasizing also the role of electronically-excited states in affecting the electron energy distribution function of free electrons. Finally, the thermodynamic properties and the electrical conductivity of non-ideal, high-density hydrogen plasma are finally discussed, in particular focusing on the pressure ionization phenomenon in high-pressure high-temperature plasmas.

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Chemistry in laser-induced plasmas at local thermodynamic equilibrium

Shabanov

Gornushkin

2018

Appl. Phys. A

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Multi-GPU unsteady 2D flow simulation coupled with a state-to-state chemical kinetics

Cited by 20 publications

References 28 publications

State-Specific Study of Air in the Expansion Tunnel Nozzle and Test Section

State-Specific Study of Air in the Expansion Tunnel Nozzle and Test Section

Elementary Processes and Kinetic Modeling for Hydrogen and Helium Plasmas

Chemistry in laser-induced plasmas at local thermodynamic equilibrium

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