An open-source hybrid CFD-DSMC solver for high speed flows

Espinoza, Daniel; Casseau, Vincent; Scanlon, Thomas; Brown, Richard E.

doi:10.1063/1.4967557

Cited by 17 publications

(5 citation statements)

References 32 publications

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“…The discrepancies observed between the CFD and DSMC codes for Kn GLL numbers outwith the continuum regime will motivate the development of an open-source hypersonic hybrid hydrodynamic-molecular gas flow solver using both the dsmcFoam and hy2Foam codes [7].…”

Section: Discussionmentioning

confidence: 99%

A Two-Temperature Open-Source CFD Model for Hypersonic Reacting Flows, Part Two: Multi-Dimensional Analysis

et al. 2016

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hy2Foam is a newly-coded open-source two-temperature computational fluid dynamics (CFD) solver that has previously been validated for zero-dimensional test cases. It aims at (1) giving open-source access to a state-of-the-art hypersonic CFD solver to students and researchers; and (2) providing a foundation for a future hybrid CFD-DSMC (direct simulation Monte Carlo) code within the OpenFOAM framework. This paper focuses on the multi-dimensional verification of hy2Foam and firstly describes the different models implemented. In conjunction with employing the coupled vibration-dissociation-vibration (CVDV) chemistry-vibration model, novel use is made of the quantum-kinetic (QK) rates in a CFD solver. hy2Foam has been shown to produce results in good agreement with previously published data for a Mach 11 nitrogen flow over a blunted cone and with the dsmcFoam code for a Mach 20 cylinder flow for a binary reacting mixture. This latter case scenario provides a useful basis for other codes to compare against.

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Section: Discussionmentioning

confidence: 99%

A Two-Temperature Open-Source CFD Model for Hypersonic Reacting Flows, Part Two: Multi-Dimensional Analysis

et al. 2016

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“…(1) Kn = /L, Fig. 2 Characteristics of hypersonic flows [17,18] There are four commonly accepted flow regimes [8,22], as shown in Fig. 3.…”

Section: Applicability Judgment Rules Of the Cfd Methodsmentioning

confidence: 99%

A review of the mathematical modeling of equilibrium and nonequilibrium hypersonic flows

Zhang

Wang

et al. 2022

Adv. Aerodyn.

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This paper systematically reviews the mathematical modeling based on the computational fluid dynamics (CFD) method of equilibrium and nonequilibrium hypersonic flows. First, some physicochemical phenomena in hypersonic flows (e.g., vibrational energy excitation and chemical reactions) and the flow characteristics at various altitudes (e.g., thermochemical equilibrium, chemical nonequilibrium, and thermochemical nonequilibrium) are reviewed. Second, the judgment rules of whether the CFD method can be applied to hypersonic flows are summarized for accurate numerical calculations. This study focuses on the related numerical models and calculation processes of the CFD method in a thermochemical equilibrium flow and two nonequilibrium flows. For the thermochemical equilibrium flow, the governing equations, chemical composition calculation methods, and related research on the thermodynamic and transport properties of air are reviewed. For the nonequilibrium flows, the governing equations that include one-, two-, and three-temperature models are reviewed. The one-temperature model is applied to a chemical nonequilibrium flow, whereas the two- and three-temperature models are applied to a thermochemical nonequilibrium flow. The associated calculations and numerical models of the thermodynamic and transport properties, chemical reaction sources, and energy transfers between different energy modes of the three models are presented in detail. Finally, the corresponding numerical models of two special wall boundary conditions commonly used in hypersonic flows (i.e., slip boundary conditions and catalytic walls) and related research, are reviewed.

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“…The solver employs the adapted version to unstructured meshes of the KNP scheme. It is worth noting that this scheme has shown to be accurate for several supersonic flow patterns [29][30][31]36,37]. Therefore, the convective terms are evaluated as…”

Section: Finite Volume Formulationmentioning

confidence: 99%

OpenFOAMTM Simulation of the Shock Wave Reflection in Unsteady Flow

2022

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This work studies the impact of a shock wave traveling with non-constant velocity over straight surfaces, generating an unsteady and complex reflection process. Two types of shock waves generated by sudden energy released are studied: cylindrical and spherical. Several numerical tests were developed considering different distances between the shock wave origin and the reflecting surface. The Kurganov, Noelle, and Petrova (KNP) scheme implemented in the rhoCentralFoam solver of the OpenFOAMTM software is used to reproduce the different shock wave reflections and their transitions. The numerical simulations of the reflected angle, Mach number of the shock wave, and position of the triple point are compared with pseudo-steady theory numerical and experimental studies. The numerical results show good accuracy for the reflected angle and minor differences for the Mach number. However, the triple point position is more difficult to predict. The KNP scheme in the form used in this work demonstrates the ability to capture the phenomena involved in the unsteady reflections.

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An open-source hybrid CFD-DSMC solver for high speed flows

Cited by 17 publications

References 32 publications

A Two-Temperature Open-Source CFD Model for Hypersonic Reacting Flows, Part Two: Multi-Dimensional Analysis

A Two-Temperature Open-Source CFD Model for Hypersonic Reacting Flows, Part Two: Multi-Dimensional Analysis

A review of the mathematical modeling of equilibrium and nonequilibrium hypersonic flows

OpenFOAMTM Simulation of the Shock Wave Reflection in Unsteady Flow

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