LAUSR

Convergence acceleration of continuous adjoint solvers using a reduced‐order model

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0 Published in 2018 at "International Journal for Numerical Methods in Fluids"

DOI: 10.1002/fld.4468

Abstract: Summary A novel acceleration technique using a reduced-order model is presented to speed up convergence of continuous adjoint solvers. The acceleration is achieved by projecting to an improved solution within an iterative process solely using… read more here.

Keywords: reduced order; adjoint; order model; order ... See more keywords

On the use of the continuous adjoint method to compute nongeometric sensitivities

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1 Published in 2018 at "International Journal for Numerical Methods in Fluids"

DOI: 10.1002/fld.4473

Abstract: Summary This work explores an alternative approach to computing sensitivity derivatives of functionals, with respect to a broader range of control parameters. It builds upon the complementary character of the Riemann problems that describe the… read more here.

Keywords: continuous adjoint; adjoint; method compute; use continuous ... See more keywords

Adjoint Complement to the Universal Momentum Law of the Wall

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2 Published in 2021 at "Flow, Turbulence and Combustion"

DOI: 10.1007/s10494-021-00286-7

Abstract: The paper is devoted to an adjoint complement to the universal Law of the Wall (LoW) for fluid dynamic momentum boundary layers. The latter typically follows from a strongly simplified, unidirectional shear flow under a… read more here.

Keywords: adjoint; complement universal; turbulence; adjoint complement ... See more keywords

Adjoint-based sensitivity analysis by panel methods and CAS

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0 Published in 2017 at "Optimization Letters"

DOI: 10.1007/s11590-016-1042-4

Abstract: The work presented in this paper deals with the accuracy of the sensitivity derivatives of aerodynamic cost functions obtained by using an adjoint method. The accuracy of these gradients is evaluated by comparison with gradients… read more here.

Keywords: adjoint; analysis panel; adjoint based; based sensitivity ... See more keywords

The Monte Carlo GPT methodology for the analysis of ratios of functionals bilinear with the real and adjoint neutron fluxes

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1 Published in 2017 at "Annals of Nuclear Energy"

DOI: 10.1016/j.anucene.2017.03.044

Abstract: Abstract Perturbation methods are part of the reactor physics foundation devoted to the study of fundamental quantities used in design and safety analysis of nuclear reactors. In deterministic codes, such as ERANOS, standard perturbation theory… read more here.

Keywords: methodology; carlo gpt; adjoint; gpt methodology ... See more keywords

Generalized Iterated Fission Probability for Monte Carlo eigenvalue calculations

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0 Published in 2017 at "Annals of Nuclear Energy"

DOI: 10.1016/j.anucene.2017.04.014

Abstract: Abstract The so-called Iterated Fission Probability (IFP) method has provided a major breakthrough for the calculation of the adjoint flux and more generally of adjoint-weighted scores in Monte Carlo eigenvalue calculations. So far, IFP has… read more here.

Keywords: adjoint; monte carlo; carlo eigenvalue; adjoint weighted ... See more keywords

Adjoint neutron flux calculations with Tripoli-4®: Verification and comparison to deterministic codes

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0 Published in 2018 at "Annals of Nuclear Energy"

DOI: 10.1016/j.anucene.2017.12.001

Abstract: Abstract The possibility of computing adjoint-weighted scores by Monte Carlo methods is a subject of active research. In this respect, a major breakthrough has been achieved thanks to the rediscovery of the so-called Iterated Fission… read more here.

Keywords: adjoint; deterministic codes; neutron flux; code ... See more keywords

Comparison of sensitivity calculation between mathematical and physical adjoint in the 2-D/1-D transport solver KYADJ

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1 Published in 2019 at "Annals of Nuclear Energy"

DOI: 10.1016/j.anucene.2019.03.004

Abstract: Abstract Sensitivity and Uncertainty analysis (S&U) based on the Classical Perturbation Theory (CPT) requires the solution of the adjoint flux. The adjoint flux is used as a weight function for sensitivity calculation. In the previous… read more here.

Keywords: adjoint flux; sensitivity calculation; calculation; adjoint ... See more keywords

Tracking sensitive source areas of different weather pollution types using GRAPES-CUACE adjoint model

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1 Published in 2018 at "Atmospheric Environment"

DOI: 10.1016/j.atmosenv.2017.11.041

Abstract: Abstract In this study, the sustained pollution processes were selected during which daily PM2.5 concentration exceeded 75 μg/m3 for three days continuously based on the hourly data of Beijing observation sites from July 2012 to December… read more here.

Keywords: adjoint; pollution; source; objective time ... See more keywords

Adjoint-based optimization of displacement ventilation flow

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0 Published in 2017 at "Building and Environment"

DOI: 10.1016/j.buildenv.2017.07.030

Abstract: Abstract We demonstrate the use of the ‘Direct-Adjoint-Looping method’ for the identification of optimal buoyancy-driven ventilation flows governed by Boussinesq equations. We use the incompressible Reynolds-averaged Navier-Stokes (RANS) equations, derive the corresponding adjoint equations and… read more here.

Keywords: adjoint; adjoint based; based optimization; displacement ventilation ... See more keywords

A discrete adjoint based level set topology optimization method for stress constraints

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1 Published in 2021 at "Computer Methods in Applied Mechanics and Engineering"

DOI: 10.1016/j.cma.2020.113563

Abstract: Abstract This paper proposes a new methodology for computing boundary sensitivities in level set topology optimization using the discrete adjoint method. The adjoint equations are constructed using the discretized governing field equations. The objective function… read more here.

Keywords: level set; set topology; topology optimization; adjoint ... See more keywords