Modal decomposition techniques are used to analyse the wake field past a marine propeller achieved by previous numerical simulations (Muscari et al. Comput. Fluids , vol. 73, 2013, pp. 65–79). In particular, proper orthogonal (POD) and dynamic mode (DMD) identify most energetic modes those that play dominant role in inception of destabilization mechanisms. Two different operating conditions, representative light high loading considered. The analysis shows strong dependence temporal spatial...

The structural design of the rudder, traditionally based on quasisteady loads generated during worst manoeuvres, should account for load fluctuations associated with interaction wake propeller in order to comply more stringent requirements ship vibration and noise pollution. In this context, present work analyses dynamic response a marine rudder located INSEAN E779A by one-way fluid–structure approach. time-dependent pressure distribution obtained through detached eddy simulation, is used...

The structural response of a rudder in the wake marine propeller is investigated by one-way fluid–structure interaction approach. unsteady pressure field gathered detached eddy simulations provided to solver for computation deformations and stresses rudder. study compares at neutral two equal opposite rotations, which are representative design conditions straight motion maneuvering that experienced under action autopilot course control or weak maneuvering. analysis sheds light on different...

For the effective operation of sonar system mounted inside bulbous a fast ship, it is important to reduce all possible noise and vibration sources that cause dome vibrate thus radiating interfering with sensor response. In particular, pressure fluctuations induced by turbulent boundary layer on surface represent one major self-noise for board sensors. Calculation structural vibrations radiated requires as first step characterization frequency spectra excitation. Most literature related wall...

The displacement of air masses caused by the movement objects or vehicles is often characterized considerable energy content, which, with appropriate technologies, can be partially recovered. In this sense, numerous scientific works consider rail transport as a possible context for application. However, literature in sector highlights how using existing wind technologies these areas involves many difficulties, mainly related to turbulent and impulsive nature airflows generated. This work...

Due to the high computational cost associated numerical evaluation of wall pressure fluctuations at Reynolds number and economical technical difficulties related full scale measurements, it is not easy obtain spectra representative real conditions. In this context, identification most appropriate scaling laws for power spectral densities wall-pressure fields as well development theoretical models its cross-spectral density representation can provide a chance solve specific problem. Moreover,...

In this paper a summary is presented concerning several experiences in predicting and measuring the structural response under turbulent boundary layer excitations. The theoretical, numerical experimental evaluations involved both wind tunnel towing tank (water) tests which flow wetted plane plate over one face. A critical review of all these sets together with possibility to adopt dimensionless representation for response. This done order tentatively compare measurement and/or predictive...

The quality of the predictive response a structural domain, under random and convective load, is here analyzed by discussing each step numerical procedure. response, due to wall pressure distribution, derived in modal coordinates according finite element scheme. basis can include dry or wet (aeroelastic) mode shapes: present analysis only vacuum eigenvectors are used. For such problem one most critical points transformation distribution into discrete locations. In fact, this depends on (i)...