A Virtual Body Force Momentum Source Method for Refined Numerical Solution of Reactor Core

Abstract

The invention relates to the field of three-dimensional refined CFD numerical calculation methods, in particular to a virtual volume force momentum source method for the refined numerical solution of a reactor core. A virtual body force is applied to the fluid in the space originally occupied by the vanes as the source term of the momentum equation to consider the influence of the blended vanes on the flow field; the virtual body forces in all directions are added to the momentum conservation equation, and each The component force is decomposed in the rectangular coordinate system, and the component forces in the three directions of x, y, and z in the rectangular coordinate system are obtained and described mathematically. The present invention uses the momentum equation to solve the flow field iteratively, so as to completely realize the effect of simulating the flow field of the blended wing in the simple channel without the blended wing, and greatly improve the efficiency and calculation accuracy of the three-dimensional refined CFD numerical calculation.

Description

technical field [0001] The invention relates to the field of a three-dimensional refined CFD numerical calculation method, in particular to the field of a virtual volume force momentum source method for the refined numerical solution of a reactor core. Background technique [0002] The contradiction between the rapid growth of energy demand and energy shortage has become one of the major problems in the world today. Studies have shown that by 2030, the world's energy consumption will increase by 35% to 49% compared with 2010. The development and utilization of new clean energy can not only alleviate the increasingly serious energy crisis, but also restrain global warming to a certain extent. In the middle of the last century, the use of nuclear energy came into being in this context. At present, various types of nuclear reactors have been widely used in the fields of electric power, heating and power engineering. Among the nuclear reactors, the most mature, reliable and w...

AI Technical Summary

Problems solved by technology

Although the "segmented solution technology" and "polyhedral mesh technology" can greatly improve the calculation efficiency compared with the traditional calculation method, can effectively expand the scale of the rod bundle in the numerical calculation and solve the problem of axial solution, but considering the real reactor pressure vessel Due to the large number of internal components and complex structure, and the huge size of the fuel assembly itself and the serious cross-scale problems, the above methods are still difficult to solve the problem of numerical solution of the whole core and full scale range under the existing computer hardware level

Images