A fundamental equation and a boundary condition of flow based on the inviscid linear theory of a compressible flow are derived (step S1) and displayed in the integral form of a variational principle (step S2). 圧縮性流れの非粘性線形理論に基づく流れの基礎式と境界条件を導き(ステップS1)、変分原理の積分形で表示する(ステップS2)。 - 特許庁