Nonequilibrium flow through porous thermal protection materials, Part II: Oxidation and pyrolysis

Poovathingal, Savio J.; Stern, Eric C.; Nompelis, Ioannis; Schwartzentruber, Thomas E.; Candler, Graham V.

doi:10.1016/j.jcp.2018.02.043

Cited by 41 publications

(13 citation statements)

References 46 publications

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“…[26], and modeled with DSMC in Ref. [27], using samples with different densities (and thus porosities) than the one used here. The off-diagonal terms are several orders of magnitude smaller than the diagonal terms, suggesting that the sample was well aligned to the manufactured plane when imaged.…”

Section: Simulations Resultsmentioning

confidence: 99%

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Permeability Calculation of a Fibrous Thermal Insulator Using the Lattice Boltzmann Method

Leclaire

Trépanier

et al. 2021

Journal of Thermophysics and Heat Transfer

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Section: Simulations Resultsmentioning

confidence: 99%

“…Nevertheless, that wall-time remains orders of magnitude smaller than those obtained when using DSMC. Studies performed on similar materials reported wall-times of a few days, using ∼ 100 cores [27,32].…”

Section: Simulations Resultsmentioning

confidence: 99%

Permeability Calculation of a Fibrous Thermal Insulator Using the Lattice Boltzmann Method

Leclaire

Trépanier

et al. 2021

Journal of Thermophysics and Heat Transfer

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“…[26], and modeled with DSMC in Ref. [27], using samples with different densities (and thus porosities) than the one used here.…”

Section: Simulations Resultsmentioning

confidence: 99%

Permeability calculation of a fibrous thermal insulator using the Lattice Boltzmann method

Ho¹,

Leclaire²,

Trépanier³

et al. 2020

Preprint

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The Lattice Boltzmann method is used to compute the permeability of FiberForm, a fibrous thermal insulator commonly used as the substrate of thermal protection systems materials. The results are compared to experiment and numerical results that uses another approach. The Lattice Boltzmann approach proves to be as accurate as other computational methods but shows a computational efficiency that is orders of magnitude smaller.

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“…Common applications include satellites [16], reentry vehicles [17], and microelectromechanical systems [18]. A number of studies have used DSMC to study subsonic flows through channels or porous materials [19][20][21][22][23][24][25][26][27][28]. Fewer studies have investigated subsonic, external aerodynamic flows around a body [12,[29][30][31].…”

Section: Gasmentioning

confidence: 99%

Low-Speed DSMC Simulations of Hotwire Anemometers at High-Altitude Conditions

Roseman

Argrow

2021

Fluids

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Numerical simulations of hotwire anemometers in low-speed, high-altitude conditions have been carried out using the direct simulation Monte Carlo (DSMC) method. Hotwire instruments are commonly used for in-situ turbulence measurements because of their ability to obtain high spatial and temporal resolution data. Fast time responses are achieved by the wires having small diameters (1–5 μm). Hotwire instruments are currently being used to make in-situ measurements of high-altitude turbulence (20–40 km). At these altitudes, hotwires experience Knudsen number values that lie in the transition-regime between slip-flow and free-molecular flow. This article expands the current knowledge of hotwire anemometers by investigating their behavior in the transition-regime. Challenges involved with simulating hotwires at high Knudsen number and low Reynolds number conditions are discussed. The ability of the DSMC method to simulate hotwires from the free-molecular to slip-flow regimes is demonstrated. Dependence of heat transfer on surface accommodation coefficient is explored and discussed. Simulation results of Nusselt number dependence on Reynolds number show good agreement with experimental data. Magnitude discrepancies are attributed to differences between simulation and experimental conditions, while discrepancies in trend are attributed to finite simulation domain size.

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Nonequilibrium flow through porous thermal protection materials, Part II: Oxidation and pyrolysis

Cited by 41 publications

References 46 publications

Permeability Calculation of a Fibrous Thermal Insulator Using the Lattice Boltzmann Method

Permeability Calculation of a Fibrous Thermal Insulator Using the Lattice Boltzmann Method

Permeability calculation of a fibrous thermal insulator using the Lattice Boltzmann method

Low-Speed DSMC Simulations of Hotwire Anemometers at High-Altitude Conditions

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