A Boundary Treatment Method for Simulation of Air Bubble Entrainment in MCCI by Particle Method

Abstract

A particle method for simulating the boundary processing method of bubble entrainment in MCCI, the steps are as follows: 1, establish a geometric model, and input the required initial parameters; 2, initialize the density information corresponding to the boundary particles; 3, establish the density information of each particle Neighboring particle domain; 4. Calculate the boundary particle density according to the fluid particles in the boundary particle's neighbor particle domain; 5. Calculate the pressure according to the boundary particle density; 6. Solve the pressure gradient of the particle, and update the velocity and position information of the fluid particle; 7 . Determine whether to end the calculation according to whether the calculation time reaches the set calculation time. If the calculation does not end, repeat step 3-7. The calculation process is shown in Figure 1. The method of the invention fully considers the influence of the particle method on the calculation stability of the boundary pressure of the control domain by the fluctuation of the melt interface in the process of simulating the MCCI. Through this approach, the understanding of mass and energy exchange at the melt interface during MCCI can be improved.

Description

technical field [0001] The present invention relates to the simulation of entrainment phenomenon of air bubbles generated by concrete melting on the layered interface of reactor core melt during the Molten-Core Concrete Interaction (MCCI) process after a serious nuclear reactor accident by using particle method. It specifically relates to a particle method for simulating the boundary processing method of bubble entrainment in MCCI, in order to improve the accuracy and reliability of the particle method for simulating the entrainment of bubbles at the layered interface of the melt in the MCCI process, and to improve the accuracy and reliability of the melt in the MCCI process. The ability to simulate and analyze mass and energy exchange phenomena on layered interfaces. Background technique [0002] At present, the particle method has demonstrated a powerful numerical simulation ability in capturing the problem of free representation with drastic changes. In the field of seve...

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Problems solved by technology

[0003] In order to overcome the above-mentioned problems in the prior art, the object of the present invention is to avoid the discontinuity problem of boundary particle density at the boundary of the geometric model and the particle density of the melt fluid when using the particle method to simulate the bubble entrainment phenomenon in the MCCI process. Resulting pressure oscillations and pressure solution inaccuracies

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