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本文针对基于位移（结构）—压力（流体）格式的流固耦合方程及其引入旋转周期分析方法后表达格式在数值求解中遇到的一些问题，给出了具体的处理方法。其中包括考虑流体液面为自由时，流体刚度矩阵奇异性的消除方法，以及对于旋转轴上包含自由度的系统在引入旋转周期方法后的约束问题，文中给出了系统的处理方法。通过实际算例验证表明，上述方法是有效和可靠的。
In this paper, some problems encountered in the numerical solution of the fluid-structure interaction equations based on the displacement (structure) -pressure (fluid) format and the expression format after the introduction of the rotation period analysis method are given. The specific treatment methods are given. Including the elimination of singularity of fluid stiffness matrix when the fluid surface is free, and the constraint of the rotation-axis method after the system containing the degrees of freedom on the rotation axis are given. The actual example shows that the above method is effective and reliable.