CAJ | 학술논문

对自由流体冲击弹性结构体涉及的自由界面运动、弹塑性变形、流固耦合作用等问题进行模拟时要求能有效计算介质运动变形与流固间耦合作用。利用光滑粒子流体动力学方法将流体、弹性体视为连续介质，用统一的 N －S方程与虚拟压缩状态方程求解。基于初始粒子类型划分提出新的介质接触算法，通过在结构体表面增加结构体表面粒子，使流体与弹性体介质间相互作用实现稳定传递。计算结果表明，所用 SPH 统一算法与接触算法能准确有效模拟自由流体冲击弹性结构体变形回弹过程。
대자유류체충격탄성결구체섭급적자유계면운동、탄소성변형、류고우합작용등문제진행모의시요구능유효계산개질운동변형여류고간우합작용。이용광활입자류체동역학방법장류체、탄성체시위련속개질，용통일적 N －S방정여허의압축상태방정구해。기우초시입자류형화분제출신적개질접촉산법，통과재결구체표면증가결구체표면입자，사류체여탄성체개질간상호작용실현은정전체。계산결과표명，소용 SPH 통일산법여접촉산법능준학유효모의자유류체충격탄성결구체변형회탄과정。
Free surface flow impacting elastic structure is a common problem,usually referring to interface track, elastic or plastic structural deformation and fluid-structure interaction.To simulate these problems,it has to capture the deformation of interfacial flow and compute the fluid structure coupling interaction accurately.A smoothing particle hydrodynamics (SPH)uniform method where both fluid and solid phases are described by SPH was presented and the uniform continuous medium governing equations and week pressure state equation were solved.A new contact algorithm with the structure surface particles treated as virtual particles was developed.The virtual particles were defined in initial particle configuration,containing both fluid and structure particle characters and producing repulsive force to prevent penetration.Comparing the numerical results with experimental ones,it is demonstrated that the SPH uniform method with the new contact algorithm can be used to simulate the free surface flow impacting elastic structure problem easily and accurately.