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Title	Numerical stability and accuracy of temporally coupled multi-physics modules in wind-turbine CAE tools /
Format	online resource
Internet Access	https://purl.fdlp.gov/GPO/gpo158360
Author	Gasmi, Amir, author.
Published	Golden, Colorado : National Renewable Energy Laboratory, February 2013.

SuDoc Number	E 9.17:NREL/CP-2 C 00-57298
Item Number	0430-P-04 (online)
Variation of Title	Numerical stability and accuracy of temporally coupled multi-physics modules in wind-turbine computer-aided engineering tools
Description	1 online resource (16 pages) : illustrations (some color).
Content Type	text
Series	(Conference paper (National Renewable Energy Laboratory (U.S.)) ; NREL/CP-2C00-57298.)
General Note	"Presented at the 51st AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition."
Bibliography	Includes bibliographical references (page 16).
Abstract	In this paper we examine the stability and accuracy of numerical algorithms for coupling time-dependent multi-physics modules relevant to computer-aided engineering (CAE) of wind turbines. This work is motivated by an in-progress major revision of FAST, the National Renewable Energy Laboratory’s (NREL’s) premier aero-elastic CAE simulation tool. We employ two simple examples as test systems, while algorithm descriptions are kept general. Coupled-system governing equations are framed in monolithic and partitioned representations as differential-algebraic equations. Explicit and implicit loose partition coupling is examined. In explicit coupling, partitions are advanced in time from known information. In implicit coupling, there is dependence on other-partition data at the next time step; coupling is accomplished through a predictor-corrector (PC) approach. Numerical time integration of coupled ordinary-differential equations (ODEs) is accomplished with one of three, fourth-order fixed-time-increment methods: Runge-Kutta (RK), Adams-Bashforth (AB), and Adams-Bashforth-Moulton (ABM). Through numerical experiments it is shown that explicit coupling can be dramatically less stable and less accurate than simulations performed with the monolithic system. However, PC implicit coupling restored stability and fourth-order accuracy for ABM; only second-order accuracy was achieved with RK integration. For systems without constraints, explicit time integration with AB and explicit loose coupling exhibited desired accuracy and stability.
Metadata Source	Description based on online resource; title from PDF title page (NREL, viewed on Aug. 2, 2021).
Subject	American Institute of Aeronautics and Astronautics.
Subject	AIAA Aerospace Sciences Meeting (51st : 2013 :
Subject - LC	Wind turbines.
	Aerodynamics -- Mathematical models.
	Computer-aided engineering.
Added Entry	National Renewable Energy Laboratory (U.S.), issuing body.
URL	Address at time of PURL creation https://www.nrel.gov/docs/fy13osti/57298.pdf

Holdings	All items

OCLC Number	(OCoLC)1065866869 (OCoLC)847798805
CGP Record Link	https://catalog.gpo.gov:443/F/?func=direct&doc_number=001161182&local_base=GPO01PUB
System Number	001161182

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