Hydrodynamic damping enhancement by implementing a novel combined rigid-elastic heave plate

Abazari, Abuzar; Behzad, Mahdi; Thiagarajan, Krish

doi:10.1007/s00773-020-00732-7

Cited by 7 publications

(4 citation statements)

References 26 publications

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“…It is noted that Froude scaling law is important when the gravity waves affect an object vibrating near the free surface. 22 In the present study, the free surface modeling is just for checking that if the disk can be affected by the free surface or not at the specified depth. Even if the free surface is not considered the same hydrodynamic coefficients will be obtained in the specified depth.…”

Section: Numerical Proceduresmentioning

confidence: 99%

“…The procedure for obtaining the added mass and damping is done by applying the windowing method on the recorded force signal. 15,22 The velocity signal is divided into different windows, each one contains a velocity peak. The coefficients of B and m a are calculated via the least squares method for each window in which m a is rejected in this stage.…”

Section: Numerical Proceduresmentioning

confidence: 99%

“…21 Furthermore, a novel combined rigid-elastic plate has been recently proposed to increase the damping compared to commonly used rigid heave plates. 22 Hydrodynamic characteristics of two uniform plates clearly showed that a strong vortex interaction between two adjacent disks occurs at a spacing smaller than the vibration stroke. Abazari et al 23 found through experiments that altering the pattern of the disk edges from uniform to a non-uniform configuration causes the vortices to grow with less interaction.…”

Section: Introductionmentioning

confidence: 99%

“…21 Furthermore, a novel combined rigid-elastic plate has been recently proposed to increase the damping compared to commonly used rigid heave plates. 22…”

Section: Introductionmentioning

confidence: 99%

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Vortex shedding modes around oscillating non-uniform double heave plates

Abazari

Alvandi

Behzad

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part M:

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Multiple co-axial heave plates of uniform geometry are attached to offshore platforms for inducing damping and added mass. These effects generally decrease the magnitude of the dynamic response of the platform under applied environmental excitation forces. When spacing between heave plates is decreased the damping and added mass performance are altered due to their strong vortex interaction. A new non-uniform plate configuration is proposed that may create different hydrodynamic characteristics. The modes of vortex shedding around plate edges in a non-uniform arrangement under forced harmonic oscillation are investigated via the CFD method. Furthermore, a new simplified formula for the total theoretical added mass of a general non-uniform double disk is proposed when it is in the zone which vortex interaction take places. The results show that a non-uniform double disk has better hydrodynamic performance as compared to the uniform double configuration for a given spacing. It is also observed that the mode and direction of the vortex shedding are different for uniform and non-uniform arrangements in a given spacing and KC value.

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Section: Numerical Proceduresmentioning

confidence: 99%

Section: Numerical Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…21 Furthermore, a novel combined rigid-elastic plate has been recently proposed to increase the damping compared to commonly used rigid heave plates. 22…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations