Search Results - "Najm, H. N."

Uncertainty propagation using Wiener–Haar expansions by Le Maı̂tre, O.P., Knio, O.M., Najm, H.N., Ghanem, R.G.

“…An uncertainty quantification scheme is constructed based on generalized Polynomial Chaos (PC) representations. Two such representations are considered, based…”
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Multi-resolution analysis of Wiener-type uncertainty propagation schemes by Le Maı̂tre, O.P., Najm, H.N., Ghanem, R.G., Knio, O.M.

“…A multi-resolution analysis (MRA) is applied to an uncertainty propagation scheme based on a generalized polynomial chaos (PC) representation. The MRA relies…”
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Structure of n-heptane/air triple flames in partially-premixed mixing layers by Prager, J., Najm, H.N., Valorani, M., Goussis, D.A.

“…Results of a detailed numerical analysis of an n-heptane/air edge flame are presented. The equations of a low-Mach number reacting flow are solved in a…”
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Global sensitivity analysis, probabilistic calibration, and predictive assessment for the data assimilation linked ecosystem carbon model by Safta, C, Ricciuto, D M, Sargsyan, K, Debusschere, B, Najm, H N, Williams, M, Thornton, P E

“…In this paper we propose a probabilistic framework for an uncertainty quantification (UQ) study of a carbon cycle model and focus on the comparison between…”
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On the Statistical Calibration of Physical Models by Sargsyan, K., Najm, H. N., Ghanem, R.

“…ABSTRACT We introduce a novel statistical calibration framework for physical models, relying on probabilistic embedding of model discrepancy error within the…”
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Spectral stochastic uncertainty quantification in chemical systems by Reagan, M T, Najm 4, H N, Debusschere, B J, Le Maître, O P, Knio, O M, Ghanem, R G

“…Uncertainty quantification (UQ) in the computational modelling of physical systems is important for scientific investigation, engineering design, and model…”
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A multigrid solver for two-dimensional stochastic diffusion equations by Le Maı̂tre, O.P., Knio, O.M., Debusschere, B.J., Najm, H.N., Ghanem, R.G.

“…Steady and unsteady diffusion equations, with stochastic diffusivity coefficient and forcing term, are modeled in two dimensions by means of stochastic…”
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Modeling Low Mach Number Reacting Flow with Detailed Chemistry and Transport by Najm, H. N., Knio, O. M.

“…An efficient projection scheme is developed for the simulation of reacting flow with detailed kinetics and transport. The scheme is based on a zero-Mach-number…”
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Uncertainty quantification in chemical systems by Najm, H. N., Debusschere, B. J., Marzouk, Y. M., Widmer, S., Le Maître, O. P.

“…We demonstrate the use of multiwavelet spectral polynomial chaos techniques for uncertainty quantification in non‐isothermal ignition of a methane–air system…”
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A Study of Flame Observables in Premixed Methane - Air Flames by NAJM, H. N., KNIO, O. M., PAUL, P. H., WYCKOFF, P.S.

“…The use of particular experimental flame observables as flame markers, and as measures of flame burning and heal release rates requires the establishment of…”
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Inference and combination of missing data sets for the determination of H2O2 thermal decomposition rate uncertainty by Casey, T.A., Khalil, M., Najm, H.N.

“…The thermal decomposition of H2O2 is an important process in hydrocarbon combustion, playing a particularly crucial role in providing a source of radicals at…”
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Design optimization of a scramjet under uncertainty using probabilistic learning on manifolds by Ghanem, R.G., Soize, C., Safta, C., Huan, X., Lacaze, G., Oefelein, J.C., Najm, H.N.

“…•LES simulations with three different resolutions are used to generate a training dataset for scramjet combustion.•DMAP manifolds are learned from these…”
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Entropy-based closure for probabilistic learning on manifolds by Soize, C., Ghanem, R., Safta, C., Huan, X., Vane, Z.P., Oefelein, J., Lacaze, G., Najm, H.N., Tang, Q., Chen, X.

“…In a recent paper, the authors proposed a general methodology for probabilistic learning on manifolds. The method was used to generate numerical samples that…”
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A Bayesian approach for estimating bioterror attacks from patient data by Ray, J., Marzouk, Y. M., Najm, H. N.

“…Terrorist attacks using an aerosolized pathogen have gained credibility as a national security concern after the anthrax attacks of 2001. Inferring some…”
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Spectral Methods for Parametric Sensitivity in Stochastic Dynamical Systems by Kim, D., Debusschere, B.J., Najm, H.N.

“…Stochastic dynamical systems governed by the chemical master equation find use in the modeling of biological phenomena in cells, where they provide more…”
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A Stochastic Projection Method for Fluid Flow: II. Random Process by Le Maı̂tre, Olivier P., Reagan, Matthew T., Najm, Habib N., Ghanem, Roger G., Knio, Omar M.

“…An uncertainty quantification scheme is developed for the simulation of stochastic thermofluid processes. The scheme relies on spectral representation of…”
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Uncertainty quantification in reacting-flow simulations through non-intrusive spectral projection by Reagan a, Matthew T., Najm, Habib N., Ghanem, Roger G., Knio, Omar M.

“…A spectral formalism has been developed for the “non-intrusive” analysis of parametric uncertainty in reacting-flow systems. In comparison to conventional…”
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Operator-splitting with ISAT to model reacting flow with detailed chemistry by Singer, M. A., Pope, S. B., Najm, H. N.

“…We further increase the computational performance of an operator-split projection scheme for the solution of the equations governing reacting flows with…”
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CSP analysis of a transient flame-vortex interaction: time scales and manifolds by Valorani, Mauro, Najm, Habib N., Goussis, Dimitris A.

“…The interaction of a two-dimensional counter-rotating vortex-pair with a premixed methane-air flame is analyzed with the Computational Singular Perturbation…”
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On the Adequacy of Certain Experimental Observables as Measurements of Flame Burning Rate by Najm, Habib N, Paul, Phillip H, Mueller, Charles J, Wyckoff, Peter S

“…This work presents detailed chemical kinetic computations and experimental measurements of a premixed stoichiometric N 2-diluted methane-air flame in…”
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