The study examined the flow characteristics within an LNG cargo pump, specifically focusing on how variations in the geometry of the inducer and inducer casing affect pump performance. LNG cargo pumps are essential for transferring LNG from carriers' storage tanks to onshore facilities. The inducer significantly influences the pump's suction performance, making it crucial for efficient LNG transfer. Given that the inducer often operates under challenging conditions, computational fluid dynamics (CFD) analysis was conducted on various geometric configurations. The analyses assessed velocity, pressure, efficiency, head, and pressure loss coefficient. Among the configurations studied, Case 4 exhibited the lowest efficiency and head, although the differences compared to other cases were minimal. Notably, Case 4 demonstrated more uniform pressure distributions and stable velocity profiles. Additionally, its pressure loss coefficients were 34.9% and 10.9% lower than those of Case 1 and Case 2, respectively, indicating enhanced flow stability and reduced energy loss. Overall, within the design parameters of this study, Case 4 emerged as the most optimized configuration for stable LNG transport.

This study presents results of Computational fluid dynamics (CFD) analysis conducted to evaluate performances of various functional products developed for smart bathroom systems. The primary objective was to analyze the efficiency of space heating, direct drying, and dehumidification functions in a winter bathroom environment. Representative bathroom models in South Korea were selected and detailed CFD simulations were performed on these models. Results showed that bathtub models exhibited higher efficiency overall in space heating and dehumidification than shower booth models. This was attributed to differences in bathroom structure and internal air flow. Additionally, the direct drying function showed higher efficiency in bathtub models, determined by the placement of air outlets and inlets. This study provides essential foundational data that can contribute to the design and enhancement of smart bathroom systems' functionality, offering valuable insights for the development of optimized smart bathroom products.

In this study, the design of an axial steam turbine that is installed for a using waste pressure. Airfoils and flow fields are designed based on 1D and 2D meridional plane design techniques. The 3D geometry of the steam turbine is designed considering the 1D and 2D design parameters. The turbine is designed with an average radius of 287 mm and rotates at 8,300 re v/min. The inlet boundary condition of the steam turbine was applied in consideration of the installation condition of the waste pressure turbine. When analyzing the results of the numerical simulation, the performance of the steam turbine is predicted with an output of 3.5 MW and isentropic efficiency of 88.4%. The choked flow in the nozzle throat and the flow separation in the suction side on the blades are predicted numerically, and it is expected to be a study to determine the cause of the reduction in efficiency of the steam turbine.

This study is to investigate convection cooling performance of the Secondary Battery of Electric Vehicle without heat sink. Research is focused on the comparative study on cooling between forced convection and natural convection cooling. Selected local locations for various temperature distributions had shown in the flow domain. Final temperature on the cell surface has been compared by forced convection with natural convection. According to the results of velocity and temperature distributions in the fluid domain, Buoyancy appear by density difference in the natural convection. Apparent vortex was detected in the fluid domain for forced convection. According to calculations of convective heat transfer coefficient between cell and atmosphere in the battery pack, average value of more 70-78% heat transfer coefficient increased by forced convection than natural convection. Average temperature value of the cell surface decreased up to 46.50% by forced convection. Due to vortex by air, cooling performance of forced convection is excellent. In addition, cooling on edge of the battery is better than heat source location.

Air brake valves are widely used in automotive braking systems and the Korean automobile industry depends on importing them. Therefore, we should develop the technical expertise for their domestic production. In this study, air brake valves were analyzed that can be used in a variety of automobiles. Computational fluid dynamics analysis, static structural analysis, and hyper-elastic analysis were carried out. Before production of an air brake valve system, the performance of different parts has to be evaluated, for instance by using finite element analysis. The structural stability of the product can be determined using static dynamics. The compression behavior of the O-ring is predictable by nonlinear hyper elastic analysis, although errors are possible due to one-way loading. This simulation study can both save time and reduce costs compared to the development of experimental prototypes.