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Title: HAWC2 and BeamDyn: Comparison Between Beam Structural Models for Aero-Servo-Elastic Frameworks

Abstract

This work presents a comparison of two beam codes for aero-servo-elastic frameworks: a new structural model for the aeroelastic code HAWC2 and a new nonlinear beam model, BeamDyn, for the aeroelastic modularization framework FAST v8. The main goal is to establish the suitability of the two approaches to model the structural behaviour of modern wind turbine blades in operation. Through a series of benchmarking structural cases of increasing complexity, the capability of the two codes to simulate highly nonlinear effects is investigated and analyzed. Results show that even though the geometrically exact beam theory can better model effects such as very large deflections, rotations, and structural couplings, an approach based on a multi-body formulation assembled through linear elements is capable of computing accurate solutions for typical nonlinear beam theory benchmarking cases.

Authors:
; ; ; ;
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Wind and Water Technologies Office (EE-4W)
OSTI Identifier:
1304574
Report Number(s):
NREL/CP-5000-66990
DOE Contract Number:
AC36-08GO28308
Resource Type:
Conference
Resource Relation:
Conference: Presented at the European Wind Energy Association Annual Conference and Exhibition 2015 (EWEA 2015), 17-20 November 2015, Paris, France
Country of Publication:
United States
Language:
English
Subject:
17 WIND ENERGY; HACW; BeamDyn; FAST; structural behavior; wind turbine blades

Citation Formats

Pavese, Christian, Wang, Qi, Kim, Taeseong, Jonkman, Jason, and Sprague, Michael A. HAWC2 and BeamDyn: Comparison Between Beam Structural Models for Aero-Servo-Elastic Frameworks. United States: N. p., 2016. Web.
Pavese, Christian, Wang, Qi, Kim, Taeseong, Jonkman, Jason, & Sprague, Michael A. HAWC2 and BeamDyn: Comparison Between Beam Structural Models for Aero-Servo-Elastic Frameworks. United States.
Pavese, Christian, Wang, Qi, Kim, Taeseong, Jonkman, Jason, and Sprague, Michael A. 2016. "HAWC2 and BeamDyn: Comparison Between Beam Structural Models for Aero-Servo-Elastic Frameworks". United States. doi:.
@article{osti_1304574,
title = {HAWC2 and BeamDyn: Comparison Between Beam Structural Models for Aero-Servo-Elastic Frameworks},
author = {Pavese, Christian and Wang, Qi and Kim, Taeseong and Jonkman, Jason and Sprague, Michael A.},
abstractNote = {This work presents a comparison of two beam codes for aero-servo-elastic frameworks: a new structural model for the aeroelastic code HAWC2 and a new nonlinear beam model, BeamDyn, for the aeroelastic modularization framework FAST v8. The main goal is to establish the suitability of the two approaches to model the structural behaviour of modern wind turbine blades in operation. Through a series of benchmarking structural cases of increasing complexity, the capability of the two codes to simulate highly nonlinear effects is investigated and analyzed. Results show that even though the geometrically exact beam theory can better model effects such as very large deflections, rotations, and structural couplings, an approach based on a multi-body formulation assembled through linear elements is capable of computing accurate solutions for typical nonlinear beam theory benchmarking cases.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 7
}

Conference:
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  • This work presents a comparison of two beam codes for aero-servo-elastic frameworks: a new structural model for the aeroelastic code HAWC2 and a new nonlinear beam model, BeamDyn, for the aeroelastic modularization framework FAST v8. The main goal is to establish the suitability of the two approaches to model the structural behaviour of modern wind turbine blades in operation. Through a series of benchmarking structural cases of increasing complexity, the capability of the two codes to simulate highly nonlinear effects is investigated and analyzed. Results show that even though the geometrically exact beam theory can better model effects such asmore » very large deflections, rotations, and structural couplings, an approach based on a multi-body formulation assembled through linear elements is capable of computing accurate solutions for typical nonlinear beam theory benchmarking cases.« less
  • A double-ended guillotine break in the primary coolant loop of a pressurized water reactor (PWR) is a postulated loss of coolant accient which can result in extreme dynamic loads (i.e., the asymmetric blowdown load) on the reactor pressure vessel (RPV) an vessel intervals. Design and construction of the RPV and support systems to withstand these extreme dynamic loads is very difficult. Similar high loading would also be experienced in a boiling water reactor given a similar accident. Although such a break would be an extremely rare event, its obvious safety and design implications demand that it is carefully evaluated. Themore » work discussed here is part of the Load Combinations Program at Lawrence Livermore National Laboratory to estimate the probability of a double-ended guillotine break in the primary reactor coolant loop of a selected PWR. The program employs a fracture mechanics based fatigue model to propagate cracks from an initial flaw distribution. It was found that while most of the large cracks grew into leaks, a complete (or nearly complete) circumferential crack could lead to a double-ended pipe break with prior leaking and thus, without warning. It is important to assess under what loads such a crack will result in complete pipe severance. The loads considered in this evaluation result from pressure, dead weight and seismic stresses. For the PWR hot leg considered in this investigation the internal pressure contributes the most to the load controlled stresses (i.e., stresses which can cause piping failure) and thus, the problem is treated as axisymmetric with uniform axial loading.« less
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