Journal of ETA Maritime Science

133-133

Authors: Selçuk NAS

Journal of ETA Maritime Science (JEMS), published by UCTEA Chamber of Marine Engineers, started its academic career in 2013. It first indexed in the DOAJ in 2014 and proved its quality. Later in 2016, it entered into the “Index Copernicus” citation index. In the same year, it was entitled to enter into TUBITAK TR indexes. Finally, we are pleased to inform you that “Journal of ETA Maritime Science (JEMS)”, published by UCTEA Chamber of Marine Engineers, has been selected for coverage in Clarivate Analytics products and services of WoS. JEMS will be indexed and abstracted in Emerging Sources Citation Index (ESCI). There is an Editorial Board behind this short story of JEMS’s full of success. This board members consist of highly qualified academics from different nationalities and fields, working with great devotions all around the world. In addition, the Associate Editors of JEMS, consisting of young academicians who prepare JEMS for publication four times in a year, are voluntary servants of the JEMS. Besides, the Authors who generate the journal's intellectual capital by sharing their valuable researches in JEMS have a great share in these successes. The entry of JEMS into the Web of Science Emerging Sources Citation Index (ESCI) has welcomed by the Board of UCTEA Chamber of Marine Engineers. This success will increase the attractiveness of JEMS and enable the selection of the best quality articles among many more quality articles. In this issue, we present to your attention two remarkable articles highlighting the issue of “women and sea”. In addition, we present an impressive article about the scope and academic perspective of polar research prepared by Prof. Dr. Ersan Basar in the academic perspective section of our journal. We also thank him for the cover photo of this issue.

150-160

Authors: Donatus. E. ONWUEGBUCHUNAM, Moses. O. APONJOLOSUN, Sodiq. O. BUHARI, Dotun OJO

This paper assessed the performance of jetty operations in Warri Refining and Petrochemical Company (WRPC). Primary data for the study consisted of ship turn round times, volume of cargo and number of vessels handled at the jetties for years 2004 to 2018. These variables served as key performance assessment criteria. In addition, copies of questionnaires on postulated factors affecting terminal performance were administered to a random sample of WRPC staff. Our findings showed that the jetties were being operated at less than optimum level. Trend analysis of the key performance indicators showed existence of continuous decline in operational performance of WRPC over the years covered in the study. Significant factors accounting for this performance outcome were found to include: inadequate berthing facilities, shortage of manpower supply, pipeline vandalisation, inadequate maintenance of jetty facilities and poor documentation process. The study recommended deployment of trained workforce to jetty operations, maintenance of berthing facilities, adequate funding and improved documentation of processes during jetty operations.

178-193

Authors: Oktay YILMAZ

Crossflow over cylindrical structures has been extensively studied by both academia and industry in various fields. It is responsible for in-line and transverse vibrations of marine risers. Flow-induced structural vibrations may end up with the failure of these tubular systems in oceans and seas. First experimental studies in literature signified that longitudinally grooved cylinders inspired by Saguaro trees may offer reductions both in drag and lift forces. In the present study, the performance of 2 dimensional (2D) unsteady Reynolds averaged Navier-Stokes (URANS) simulations is tested in predicting hydrodynamic force coefficients of cylinders. First, CFD runs are conducted on a smooth cylinder and a cactus-like cylinder in literature. Then flow over 8-, 10-, and 12-grooved cylinders with a diameter of 0,5 m are solved to analyze flow features in detail and evaluate the capability of 2D URANS solver for the problem at hand. k-ω SST turbulence model is employed in URANS solver. It is shown that as the number of grooves increases, mean drag slightly decreases and amplitude of drag decreases by 29%. Separation angle is significantly improved with a number of grooves from 92o to 120o. However, the amplitude of lift force increases with the number of grooves with reference to 2D CFD simulations.

210-212

Authors: Ersan BAŞAR