| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1992: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1991: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Research Abstract |
A numerical simulation is extensively used as a procedure to prospect the behaviors of thermal fluids in each kind of technical devices. The largest problem in a numerical simulation is the way how to treat a complex boundary shape of actual technical devices numerically. The numerical method to resolve the above-mentioned problem is FEM (Finite Element Method), which is easy to establish a unified flow analysis system including pre-post disposition. However, in the numerical simulation using FEM the following subjects become a serious problem : (1) the numerical algorithms to satisfy the equation of continuity efficiently, (2) the effective calculation of element coefficient matrices. Using both the simultaneous relaxation method of velocity and Bernoulli function and the integrated analysis formula of element coefficient matrices, the applicant proposed so far a new GSMAC (Generalized Simplified Marker And Cell) method, which is proper for a large-scale numerical simulation for thermal fluids. In order to verify the present numerical method, the applicant calculated the following problems numerically : (1) natural convections in concentric horizontal anulli, (2) flows around a rotaring roll, (3) entrance flows of electrically conducting fluids between two parallel plates, and efficient results were obtained. In the recent years, most of numerical method for turbulent heat transfer have been calculated using LES (Large Eddy Simulation). The conventional LES is mostly analyzed by spectrum method and FDM (Finite Difference Method). Introducing LES into GSMAC-FEM, the turbulent flows between two parallel plates are analyzed numerically. This con-firms that the present numerical method has made remarkable achievements for computational fluid dynamics with turbulent heat transfer.
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