Mohammad Hanifuddin Hakim’s research while affiliated with Universitas Muhammadiyah Surabaya and other places

The pandemic condition due to the COVID-19 virus attack has affected all areas of life throughout the earth. Post-pandemic policies and new behaviors are one of the important efforts in getting life back to normal. The pandemic has triggered many technological innovations to be carried out as further mitigation and prevention efforts. In the shipping sector, the impact of shipping restrictions and the number of passengers is detrimental due to a decrease in productivity that affects the shipping and port business. Air exchange patterns and room design are important things to be conditioned to reduce the potential for virus exposure. This article presents an investigation of computational fluid dynamics in the accommodation space of the XYZ passenger ship and simulations of potential exposures in several scenarios of ventilation conditions. By simulating 12 models of ventilation conditions, two conditions of the ships being stationary and moving, and the influence of wind from outside. Layout redesign can be applied effectively in open ventilation conditions and has less exposed bench results compared to existing conditions with an effective percentage of 0.75% - 2.3%

Currently, efforts are focused on reducing emissions to support carbon neutrality by 2050 through green technology. Green technology applies to the ship's design, port, engine selection, fuel, and operation. This study modified the hull to reduce drag and improve fuel efficiency. Changes were made based on variations in the deadrise angle, which were analyzed using numerical simulation. In the current situation, the deadrise angle is changed from 9° to 10°, 15°, and 20°. On the angle variation, the effects of changes in ship drag, fuel, and energy efficiency design index were analyzed (EEDI). The method simulates computational fluid dynamics with a Holtrop calculation method validation approach. At 12 and 6 knots above the current deadrise, resistance is reduced by 8.2% and 6.8%, respectively. The fuel efficiency achieved is 6.9% at 6 knots and 8.2% at 12 knots, resulting in monthly fuel savings of 2.43 tonnes. Furthermore, the phenomenon of the EEDI value at the lowest resistance and highest speed has a decreased performance value. Reducing the speed from 12 to 9 knots improves the performance of EEDI by 66%