Research Topic
Crack Initiation in High-pressure Gas Turbine Blade Subject to Thermal-fluid-mechanical Fatigue
Blade and vane are important components operating in extreame conditions such as high temperatures, pressure, and vibration in the gas turbine engine. Thus, some fatigue issues may occur as the formation and development of cracks decreases the life of gas turbine components and engines. In the present work, temperature and pressure data extracted from our previous computational fluid dynamics simulation were applied as loading forces into FE simulation to calculate the blade’s stress and blade life.
Aerothermodynamic and Flow Analysis of High-pressure Gas Turbine Blades
We investigate the influence of the TBC thickness, coolant on the mainstream hot gas pressure ratio, and temperature ratio on the heat transfer in realistic high-pressure turbine cooling blades by using high-quality meshes based on the Mosaic meshing technique. The blade considered is a first-stage rotor blade from F class machines. The aerothermodynamics and flow in the GT are analyzed using the CHT method.
Anaylsis of Hydrogen Combustion in Gas Turbine
We analyzed hydrogen combustion effect in gas turbine combustor using chemical reactor network method and computational fluid dynamics in order to provide solutions for developing hydrogen gas turbine.
We study thermal and fluid using computational fluid dynamics (CFD).
We aim to analyze complex flows and provide innovative solutions through theoretical and computational approaches. Hence, various fluid analysis techniques of DNS and turbulence models such as LES and RANS are used in appropriate problem domains.
Anaylsis of Convection Ventilation System
Closed spaces such as vehicles are always at risk of transmitting respiratory diseases, especially during the COVID-19 pandemic. Suitable convection ventilation system could significantly mitigate the spread of infections. The coupling of airflow dynamics and particle transport simulation was applied to optimize the environment of ambulance, resulting in minimizing the possibility of exhaled contaminant exposure from the patient to the guardian.
Anaylsis of Hyperloop Flow Characteristics
Compressible flows phenomena and aerodynamic characteristics in Hyperloop system are analyzed by using computational fluid dynamics (CFD) and compressible flow theory. We have studied the compressible flow according to various capsule (pod) shapes, speeds, and blockage ratios. This research can attribute to a new trasportation which is faster than car, high-speed train, and aircraft.
Compressible Turbulence and Hypersonic Flows Analysis of Heat Flow Characteristics
The solution of complex fluid flow such as turbulent jet, turbulent mixing layer, supersonic flow and shock wave flow is obtained by using Direct Numerical Simulations (DNS), Large Eddy Simulations (LES) and Reynolds Averaged Navier-Stokes Simulations And research is underway.
Flow-Generated Noise (Aeroacoustics)
The noise sources, noise propagation, and noise reduction are studied in relation to the flow noise generated in fluid flow.
Theoretical and Empirical Approaches
For low-cost turbulent flow simulation, low-cost turbulent flow simulation method using theoretical methods such as Parabolized Stability Equation Solver (PSE) and Linear Stability Theory (LST) and statistical extraction methods such as Proper Orthogonal Decomposition (POD) and Fourier Decomposition We are also trying to develop them.
Pulse-Wave Cardio- and Cerebrovascular Hemodynamics
In the blood flow, the ripple phenomenon of the fluid flow is very important as in the compressible fluid flow. Based on expertise in wave phenomena, such as compressible turbulent flow and flow noise, research is also underway in cardiac blood flow and cerebral blood flow. In particular, we have developed an accurate cerebral blood flow model that can accurately calculate blood flow pulsations, and have tried to develop a medical diagnosis method of strokes after linking this with the whole body blood flow. Efforts are being made to include similar mathematical / numerical models in mobile medical devices.
Disease-Progressing Aortic-Cerebral and Postoperative Hemodynamics
We conduct hemodynamic simulations to identify both the patient-specific and disease-wise aspects of progressive vascular diseases and postoperative hemodynamics. The results are analyzed based on pipe-flow fluid dynamics, medical indices, and statistical approaches to quantify and visualize the hemodynamic changes made under various conditions.
Analysis of URETHRA Flow Characteristics
The flow in the urethra of patients with Benign Prostatic Hyperplasia is analyzed and predicted by Computational Fluid Dynamics (CFD).
Nano Fluid
Investigation about the effects of the geometry and the surface charged characteristic on the ionic current in nanopore. How the variation of the surface charge effects on the flow rate through nanopore.
