TY - JOUR
T1 - A nonlinear model of vortex-induced forces on an oscillating cylinder in a fluid flow
AU - Decuyper, J.
AU - De Troyer, T.
AU - Tiels, K.
AU - Schoukens, J.
AU - Runacres, M. C.
PY - 2020/7
Y1 - 2020/7
N2 - A nonlinear model relating the imposed motion of a circular cylinder, submerged in a fluid flow, to the transverse force coefficient is presented. The nonlinear fluid system, featuring vortex shedding patterns, limit cycle oscillations and synchronisation, is studied both for swept sine and multisine excitation. A nonparametric nonlinear distortion analysis (FAST) is used to distinguish odd from even nonlinear behaviour. The information which is obtained from the nonlinear analysis is explicitly used in constructing a nonlinear model of the polynomial nonlinear state-space (PNLSS) type. The latter results in a reduction of the number of parameters and an increased accuracy compared to the generic modelling approach where typically no such information of the nonlinearity is used. The obtained model is able to accurately simulate time series of the transverse force coefficient over a wide range of the frequency–amplitude plane of imposed cylinder motion.
AB - A nonlinear model relating the imposed motion of a circular cylinder, submerged in a fluid flow, to the transverse force coefficient is presented. The nonlinear fluid system, featuring vortex shedding patterns, limit cycle oscillations and synchronisation, is studied both for swept sine and multisine excitation. A nonparametric nonlinear distortion analysis (FAST) is used to distinguish odd from even nonlinear behaviour. The information which is obtained from the nonlinear analysis is explicitly used in constructing a nonlinear model of the polynomial nonlinear state-space (PNLSS) type. The latter results in a reduction of the number of parameters and an increased accuracy compared to the generic modelling approach where typically no such information of the nonlinearity is used. The obtained model is able to accurately simulate time series of the transverse force coefficient over a wide range of the frequency–amplitude plane of imposed cylinder motion.
KW - Forced cylinder oscillations
KW - Nonlinear black-box modelling
KW - Polynomial nonlinear state-space model
KW - Signal processing
KW - System identification
KW - Vortex-induced vibrations
UR - http://www.scopus.com/inward/record.url?scp=85084942712&partnerID=8YFLogxK
U2 - 10.1016/j.jfluidstructs.2020.103029
DO - 10.1016/j.jfluidstructs.2020.103029
M3 - Article
AN - SCOPUS:85084942712
VL - 96
JO - Journal of Fluids and Structures
JF - Journal of Fluids and Structures
SN - 0889-9746
M1 - 103029
ER -