Compressible flow dynamics and heat transfer control of helium near the critical point

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In this study, direct numerical simulations were mainly performed in order to clarify laminar-turbulent transition process, vortical structures in the boundary layer and characteristics of mean field and fluctuation field in the supercritical helium near the gas-liquid critical point. Not only open system which means isobaric system but also closed system are considered in this study. In the case of the closed system, not only convection but also piston effect simultaneously occurs in the system. The simulations are performed by means of GPGPU (TESLA C2075) and CUDA 4.2 architecture are employed. These results will be applied to establishment of turbulent control and turbulent model construction for the helium near the critical point in order to predict the fluid flow phenomena and to control actual cooling channel of large scale superconducting magnet system.