• Proceedings of the Korean Society of Computer Information Conference
• /
• 2023.01a
• /
• pp.341-342
• /
• 2023

배터리 기술 고도화 및 기술표준 강화에 따라 완성차 제조사와 배터리 업계간 활발한 협업이이어질 전망이다. 또한 기존 배터리 제조사들이 활발한 증설 및 밸류 체인 확장을 통한 기술가격 경쟁력 격차 유지에 적극적으로 나서고 있어, 향후 시장 주도권 경쟁이 가속화될 것으로 전망된다. 배터리의 온도 상승은 배터리 효율을 낮추는 원인이며, 배터리 온도 제어가 전기자동차 차량의 전체 성능 향상에 중요한 부분이라고 할 수 있다. 본 연구는 실제 Battery Pack 실험 전 열유동해석을 통해 배터리온도 상승추이 및 냉각효율 검증을 진행하는 과정에서 발생하는 과도한 시간 소요를 줄이기 위해 Machine Learning 을 활용하여 검증 효율 및 설계 효율을 높이는데 그 목적이 있으며, CFD를 활용한 배터리 효율 최적화 설계를 하는 기존 모델 대비 30%~50%정도의 성능향상을 예측할 수 있다.

• Korean Chemical Engineering Research
• /
• v.50 no.2
• /
• pp.328-333
• /
• 2012

In this study, CFD simulation was performed with commercial CFD code FLUENT for the 3D mixing tank model (1 m in a diameter and 2.5 m in a height) of DME-Propane liquified fuels. Initial condition set-up with existence of DME 146 l at the upper side of mixing tank and Propane 770 l at the lower side of mixing tank. Characteristics of mixture and fluid flow were observed for 34 hours simulation. Two liquid fuel were uniformly mixed within range of 3 mol% after 24 hours, and range of 1 mol% after 34 hours. The simulation result following 4 hours was verified with KOGAS experimental data.

• Journal of the Korean Institute of Gas
• /
• v.26 no.1
• /
• pp.20-26
• /
• 2022

The results of experimental, theoretical, and numerical analysis were compared regarding the concentrations and velocities of flammable gas jets generated by pressurized leakage of methane gas. The concentration was measured through experiments for the jet dispersion process, and the velocities was calculated by applying the self-similarity theory. And the velocities and concentrations were calculated using CFD tools - FLACS and CFX- compared with the results. The difference between self-similarity model and CFD is due to the buoyancy term, which increases as the distance from a leak source increases. The results are compared with dimensionless parameters using the leak source radius and velocity components along the leak axis.

• Applied Chemistry for Engineering
• /
• v.32 no.2
• /
• pp.149-156
• /
• 2021

A kraft recovery boiler produces steam for power generation by the combustion of black liquor from the kraft pulping process. Since saturated steam became superheated in a superheater above the furnace, it is important to increase the heat exchange efficiency for the superheated steam production and power generation. A nose arch at the bottom of the superheater is important for blocking radiation from the furnace which causes corrosion of the superheater. But the nose arch is the main reason for creating a recirculation region and then decreasing the heat exchange efficiency by holding cold flue gas after the heat transfer to saturated steam. In this study, the size of recirculation region and the temperature of flue gas at the outlet were analyzed by the nose arch structure using computational fluid dynamics (CFD). As a result, when the nose arch angle changed from 106.5° (case 1) to 150° (case4), the recirculation region of flue gas decreased and the heat exchange efficiency between the flue gas and the steam increased by 10.3%.

• Journal of the Semiconductor & Display Technology
• /
• v.10 no.4
• /
• pp.139-144
• /
• 2011

CMP process is an essential element in the semiconductor product processes in Chemical Mechanical Polishing. Taken as a whole, CMP is one process, but concretely, it is a detail process which consists of polishing, cleaning, and so on. Especially, the polishing and cleaning are key points in the whole process. Polishing rate is the most important factor and is related with deposition of slurry in the polishing process. Each outlet velocities is the most important factors in cleaning process. And when the velocities are more uniform, the cleaning becomes more effective. In this research, based on these factors, we performed a numerical analysis for effective polishing and cleaning which can be applied to industrial field. Consequently, we figured out that more than one opened nozzle is more effective than one opened nozzle at the polishing pad in case of this research. And we confirmed that the revised models have the uniform velocity distribution more than the previous model of the cleaning nozzle.

• Journal of the Korea Institute of Military Science and Technology
• /
• v.26 no.2
• /
• pp.149-158
• /
• 2023

To predict the aerodynamic characteristics of the grid fins from subsonic to supersonic speeds, low fidelity SW as well as CFD SW were applied. VLM(Vortex Lattice Method) and SE(Shock-Expansion) method were used at subsonic and supersonic speed domain respectively for the rapid prediction of low fidelity SW. For 2 configurations of the grid fins, the CFD computations and tests using the trisonic wind tunnel were also performed to compare the results of the grid fins. The results of low fidelity SW, CFD SW and the wind tunnel tests data were agreed well each other. Through further research on the grid fins, the effective parameters of the grid fin configurations according to the speed regime will be investigated.

• Journal of the Korean Society of Fisheries and Ocean Technology
• /
• v.60 no.1
• /
• pp.80-86
• /
• 2024

We analyzed the performance of hubless rim propellers based on the number of blades, maintaining a fixed pitch ratio and expanded area ratio, using computational fluid dynamics (CFD). Thrust coefficient, torque coefficient and efficiency according to the number of blades were analyzed. In addition, the pressure distribution on the discharge and suction sides of the blade was analyzed. As the advance ratio increases, the thrust coefficient decreases. The highest thrust was shown when the advance ratio was lowest. For the three, four, five and six-blades, the torque coefficient tended to decrease as the advance ratio increased. In the case of seven and eight-blades, the torque coefficient tended to increase as the advance ratio increased. The maximum efficiency was found when the advance ratio was 0.8. When the three-blade, it showed high efficiency at all advance ratios. A high pressure distribution was observed at the leading edge of the discharge blade, and a low pressure distribution was observed at the trailing edge. Applying a hubless rim-driven thruster with the three-blade can generate higher thrust and increase work efficiency.

• 한국연소학회:학술대회논문집
• /
• 2012.11a
• /
• pp.339-340
• /
• 2012

The purpose of this study is to analyse, the basic parameters through experimentally and with CFD modelling, internal recirculation of the flameless combustion of natural gas. The test rig is made up of a vertical combustion chamber of circle cross section. The inner dimensions of the chamber are $0.2m{\times}1m$ (diameter x height). And CFD simulations of the combustion chamber have been performed using FLUENT 14.0. Some results of this study present the basic parameters and data of flameless combustion.

• Journal of the Korean Society of Visualization
• /
• v.10 no.1
• /
• pp.55-59
• /
• 2012

Reverse Design(RD) plays an important role in simulation engineering, such as CFD (Computational Fluid Dynamics) and Virtual Engineering and Design. RD becomes much more valuable when there is no shape data of the practical models for CFD grid generations. In this study, two-camera based rapid prototyping(RP) system is proposed. 3D-PTV based measurement algorithm was adopted. The developed system was applied to reconstruct three-dimensional data of a human face, a motorcycle model, a cylindrical body and a triangular pyramid.

• Proceeding of EDISON Challenge
• /
• 2015.03a
• /
• pp.632-635
• /
• 2015

고혹에서의 자동차의 주행성능을 높이는 장치 중 하나인 에어댐이라는 장치가 있다. 본 연구에서는 장치의 실제적인 효과를 유동가시화를 통하여 확인하고자 연구를 진행하였다. 따라서 자동차 에어댐의 장착에 따른 공력 특성을 분석해보았다. 에어댐의 유무에 따른 자동차의 공력 특성을 확인하고, 에어댐의 길이에 따라 공력 특성이 어떻게 차이가 나는지 총 세 가지로 분류하여 비교하였다. 에어댐의 법적허용 높이와 전면 범퍼 높이의 중간 값, 법적허용높이, 법적허용높이의 1/2배에 해당하는 길이의 에어댐을 장착하여 어떠한 효과가 발생하는지 확인하였다.