International Journal of Marine Engineering Innovation and Research, Vol. 3(3), Mar. 2019. 69-77 (pISSN: 2541-5972, eISSN: 2548-1479) 69 Analysis of Gottingen 428 Airfoil Turbine Propeller Design with CFD Method on Gravitational Water Vortex Power Plant Ede Mehta Wardhana 1 , Agoes Santoso 2 , Asep Rahmat Ramdani 3 Received: 04 February 2019 / Revised: 18 March 2019 / Accepted: 19 March 2019 Abstract–along with technological development and the increase in human population, the electricity needs are increasing every year. However, 94% of a power plant in Indonesia still using fossil fuels that are a pollutant and non-renewable. In addition, NASA said that the earth's temperature had risen by 1°C since 1880 and the current carbon dioxide level was the highest in the last 650,000 years. Therefore, Indonesia needs to improve, in fact, Indonesia is one of the highest emission contributors in the world. Indonesia is not yet 100% electrified, there are still 2,519 villages without electricity. Gravitational Water Vortex Power Plant (GWVPP) is a micro hydro-power plant may answer the problem because it is easy renewable energy to be made and utilized in the NIZ (not interconnected zones) region. This study will examine the changes in the number and shape of the blade, as well as the length of the chord, to know the effect on turbine power so that it can produce higher efficiency at GWVPP. Propeller turbine with a Gottingen 428 airfoil analyzed using Computational Fluid Dynamics (CFD) method. The results show that the number of blades and the length of the chord is inversely proportional to the efficiency of the turbine, and the shape of the blade is more efficient when it’s twisted. Keywords–CFD, GWVPP, Micro Hydro, Renewable Energy, Turbine. I. INTRODUCTION 1 Electricity needs are increasing every year, but the availability of energy sources such as oil, gas, and coal is depleting. In addition, the condition of the earth faced with climate change has worsened. This encourages people to immediately switch to using renewable energy by utilizing natural resources such as solar power, wind power, water flow, geothermal energy, and biological processes. In Indonesia itself, electricity distribution is being increased so that all regions to remote areas can experience the benefits of electricity so that it can increase the productivity of local residents and the economic growth of the country. To solve all those problems, Gravitational Water Vortex Power Plant (GWVPP) can be a solution because it is easy renewable energy to be made and utilized in the NIZ area. GWVPP is a new type of low head turbine system where basin structures are used to form vortex flow, then kinetic energy can be generated from turbine rotation [1-4]. GWVPP can be used in river flows by constructing power plants in watersheds. River water will flow through the ditch to the basin which contains a turbine and returns to the river, so that the turbine will rotating to produce kinetic energy and converted into electrical energy. Based on data from the Turbulent company from Belgium, they claim that the turbine is safe to pass by fish and can produce power of 5 to 100 kW depending on the flow rate of the river and the head used [5-10]. This type of plant is very suiTable for use in remote areas that have rivers, so that the area can be energy independent with a decentralized system. Ede Mehta Wardhana. Department of Marine Engineering ITS Surabaya, 60111, Indonesia. Email: edewardhana123@gmail.com Agoes Santoso. Department of Marine Engineering ITS Surabaya, 60111, Indonesia. Email: agoes@its.ac.id Asep Rahmat Ramdani, Department of Marine Engineering ITS Surabaya, 60111, Indonesia. Email: aseprahmat101@gmail.com II. METHOD In this research, turbine was designed by using CAS Software and the computational fluid dynamic (CFD) simulated by CFD Tools. The output from simulation is to know the torque and how the water flow in the basin. A. Preliminary According to the Ministry of Energy and Mineral Resources, 94% of power plants in Indonesia still using pollutant and non-renewable natural resources. While the reserves of fossil fuels are projected to run out in the next few decades and the condition of the earth is getting worse towards global climate change due to global warming. The need for clean renewable energy is undeniable. For renewable energy potential in Indonesia, according to the Ministry of Energy and Mineral Resources are in Table 1. B. Turbine Hydroelectric power plants are not separated from the turbine. Water turbines are devices for converting potential water energy into mechanical energy. This mechanical energy then converted into electrical energy by a generator. Judging from the reaction, turbines can be divided into impulse turbines and reaction turbines. The selection of the type of turbine is strongly influenced by the head and flow rate at the plant location. In addition, efficiency and cost factors are often considered [11-20]. 1) Impulse Turbine The impulse turbine generally uses the speed of the water to move the runner and is released at atmospheric pressure. The flow of water sprayed each