Hydrodynamic performance of multiple co-axial heave plates with different diameters

Vortex shedding modes around oscillating non-uniform double heave plates

“…In the next step, the interaction may be decreased by altering the uniform configuration to a non-uniform arrangement. 23 It is expected that the larger spacing than the considered values does not induce a considerable vortex interaction and the smaller ones cause the double disk acts as a thicker single disk. The numerical procedure for the uniform and non-uniform double cases are considered similar to the single disk case.…”

“…This non-uniform arrangement is different from which has been considered in the previous experimental study. 23 The test matrix for the double arrangements is presented in Table 2. These different cases aim to observe how the vortex interaction can be affected by a non-uniform shape of the disk edges instead of the commonly used uniform configuration.…”

“…It should be noted that the theoretical added mass for the definition of the A 0 and B 0 in the present study is different from the previous experimental study. 23 (a) The dominant added mass is the imagined added mass of the larger disk, as presented in equation (14).…”

“…Figure 4 shows that the variations of the damping and added mass coefficients versus KC for the presented simulation and Mendoza’s 9 datasets are in a good agreement. It is noted that Mendoza’s study is also a numerical method with its corresponding errors as has been discussed in the research of Abazari et al 29 If the skin friction plays a role in normal force indirectly the SST k − ω RANS model which is sensitive to near wall zone result in the acceptable output. There are some differences in damping coefficients at some KC values compared to Mendoza’s data, but these differences are minor and the agreement is acceptable overall.…”

“…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. However, the mechanism of the vortex formation in a non-uniform arrangement was not investigated.…”