A Numerical Investigation of the Myring Bucket Drag Coefficient on the Returning Side

Ekky Nur Budiyanto; Priyo Agus Setiawan; Dhika Aditya Purnomo; Riko Samuel Yoshida; Muzan Nalendra Putra

doi:10.57159/jcmm.5.3.26559

Authors

Ekky Nur Budiyanto Department of Marine Engineering, Politeknik Perkapalan Negeri Surabaya, Surabaya, Indonesia https://orcid.org/0009-0000-1795-2516
Priyo Agus Setiawan Department of Marine Engineering, Politeknik Perkapalan Negeri Surabaya, Surabaya, Indonesia https://orcid.org/0000-0002-9975-1570
Dhika Aditya Purnomo Department of Marine Engineering, Politeknik Perkapalan Negeri Surabaya, Surabaya, Indonesia https://orcid.org/0009-0009-3728-3394
Riko Samuel Yoshida Department of Marine Engineering, Politeknik Perkapalan Negeri Surabaya, Surabaya, Indonesia https://orcid.org/0009-0002-5809-5033
Muzan Nalendra Putra Department of Marine Engineering, Politeknik Perkapalan Negeri Surabaya, Surabaya, Indonesia https://orcid.org/0009-0008-2952-500X

DOI:

https://doi.org/10.57159/jcmm.5.3.26559

Keywords:

Myring Profile, Semicircular Bucket, Numerical Study, Drag Coefficient

Abstract

The study of solid spherical and semicircular bodies has developed significantly in fluid mechanics. The present work investigates a non-solid, semicircular bucket profile derived from the Myring equation for shape exponents n = 0.5, 0.75, 1.0, 1.5, 2.0, 2.5, and 3.0 using three-dimensional numerical simulations. The numerical study compares each profile with the original bucket geometry, n = 2, on the basis of the drag coefficient on the returning side. Experiments were first conducted in a wind tunnel with a 30 cm × 30 cm test section at wind velocities of 3, 4, and 5 m/s. Mesh-independence trials were then performed for element sizes of 0.01, 0.015, 0.02, and 0.03. The mesh of 0.01 produced the closest agreement with the experiment and was retained for all subsequent simulations across the Myring exponent. The results show that the lowest drag coefficient is obtained at n = 3, which also corresponds to the smallest vortex formation behind the bucket.

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