気液二相流数値解析法に関する研究

概要

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Finite volume method has been used in gas-liquid two-phase analysis for the enhancement of calculation speed and stability. It is well known that the finite volume method has a weak point of having errors in mass balance over the flow domain as a whole because convergence in the finite volume method is validated only within each cell. For the single-phase flow, the unbalanced mass over the flow domain is distributed by using the velocity profile to correct this error of mass balance. However for the two-phase flow, there are two velocities, such as those of the bubble and liquid phases and both velocities are related to each other. In addition the void distribution is connected to the liquid velocity. Thus the unbalanced mass cannot be corrected in terms of the velocity profile alone. This error of mass balance makes a strong influence to the flow domain of the bubble flow where the void coefficient is under 0.05. In this paper we applied the donor-accepter method to correct the unbalanced mass and improved the accuracy of the numerical analysis.
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