CAJ | 학술논문

基于相对运动思想，通过求解3D N-S 方程，给出了一种水下航行体附加质量高精度、高效的计算方法，可方便给出仸意几何外形航行体的附加质量。该方法中，水下航行体的附加惯性力(力矩)通过非定常运动与定常运动流体动力之差获得，迚而获得附加质量。通过在动量方程添加源项求解航行体非定常运动流场，一方面保证能够模拟真实流场结构，另一方面避免采用动网格过程中由于复杂网格重生带来的困难，同时由于只采用了一套网格，计算精度得到迚一步保证。本文计算方法的精度通过椭球精确解得到有效验证，具有重要的工程应用价值。
기우상대운동사상，통과구해3D N-S 방정，급출료일충수하항행체부가질량고정도、고효적계산방법，가방편급출요의궤하외형항행체적부가질량。해방법중，수하항행체적부가관성력(력구)통과비정상운동여정상운동류체동력지차획득，중이획득부가질량。통과재동량방정첨가원항구해항행체비정상운동류장，일방면보증능구모의진실류장결구，령일방면피면채용동망격과정중유우복잡망격중생대래적곤난，동시유우지채용료일투망격，계산정도득도중일보보증。본문계산방법적정도통과타구정학해득도유효험증，구유중요적공정응용개치。
A high-precision and high-efficiency method of computing additional mass for an underwater vehicle is pro-posed by solving the 3-D N-S equations based on the relative motion principle. This method is convenient to compute the additional mass for an underwater vehicle with complex shapes. The additional inertia force (moment) is achieved from the difference of hydrodynamics of fluids in unsteady and steady motions, then the additional mass is obtained. By adding the source term to the momentum equation, the unsteady flow field is solved to simulate the real structure of flow field, and the difficulty generated by complex grid rebirth in using the dynamic grid is avoided. The accuracy of the proposed method is also assured because of adopting the same grid. The validity of the proposed method is verified by the exact solution of ellipsoid.