Numerical simulation

  • The ultrasound simulation using the finite element method of voxel type
  • Advancement of general-purpose simulation code
  • Electromagnetic field heat flow coupled simulation (GSMAC-MHD)
  • Nuclear power plant behavior analysis

The ultrasound simulation using the finite element method of voxel type

Computational fluid dynamics, usually abbreviated as CFD, is a branch of fluid mechanics that uses numerical methods and algorithms to solve and analyze problems that involve fluid flows. Computers are used to perform the calculations required to simulate the interaction of liquids and gases with surfaces defined by boundary conditions. CFD with finite element method (FEM) is used in structural analysis of solids, but is also applicable to fluids. However, the FEM formulation requires special care to ensure a conservative solution. The FEM formulation has been adapted for use with fluid dynamics governing equations. In addition, the accuracy flow rate measurement using Ultrasonic velocity profile can be compared using CFD data. It can improve the performance of Ultrasonic flow rate measurement.

Advancement of general-purpose simulation code

Numerical analysis code is commercially available with small memory usage and calculation speed. However, the commercial computer code exist some limitations for some special conditions. One of main our objective is to develop the computer code by modifying the source code in order adequate of some special physical phenomena. This kind of research allows improving the simulation code performance.

Electromagnetic field heat flow coupled simulation  (GSMAC-MHD)

The High-level radioactive waste is reprocessed into waste liquid, and the waste liquid is mixed into molten glass in a Joule heated glass furnace to make vitrified waste. Thermal-hydraulic behavior must be observed. However, Physical phenomena taking place inside Joule-heated glass melter are quite complex and interrelated. So, it is very difficult to simulate the flow behavior. One of the opportunities is use Generalized Simplified Marker and Cell?Mageto-HydroDynamic-Finite Element Method (GSMAC-MHD-FEM) simply named GSMAC-MHD that combined temperature, flow and magnetic field. GSMAC-MHD is three-dimensional analysis code.

Nuclear power plant behavior analysis (SAMPSON, RELAP, RETRAN)

Using the reactor behavior analysis code, we are realizing accident management research for mitigation and avoidance of severe accidents. In our laboratory, the severe accident analysis code SAMPSON is using to analyze the behavior of the reactor core melting. RELAP 5 computer code applications in the computing and simulation for light water reactors in steady and transient state such Loss of Coolant accident (LOCA), etc. The transient of thermal-hydraulic analysis for the two-fluid model using the RETRAN is also realized in our research.