二维GEL耦合方法的研究及对爆炸容器的数值模拟

2-D GEL Coupling Method and It's Numerical Simulation on Vessel to Explosion Impact Load

将以Euler方法为基础的MF PPM(Piecewise-Parabolic Method)程序和以Lagrange方法为基础的DEFEL(2-D Finite Elements Code,二维流体弹塑性动力有限元)程序,根据压力和法向速度连续准则进行耦合,发展了基于Level Set的GEL(Ghost-Fluid Eul-er-Lagrange)方法。该方法在处理大变形流场与小变形结构以及复杂流动与多物体相互作用等问题具有优越性。通过二维算例的计算结果与文献比较,检验了GEL方法和耦合程序的正确性,并对球形和椭球封头的爆炸容器进行了数值模拟,通过与实验结果的比较分析,表明本研究程序可以比较好地处理内爆引起的壳体流固耦合问题。

MF PPM （Piecewise-Parabolic Method） code based on Euler method and DEFEL （2-D Finite Elements Code） code based on Lagrange method were coupled according to the pressure and normal velocity consecutive rule. GEL （Ghost-fluid Euler-Lagrange） method was developed. This method has the advantage of performing large strain fluid field while small strain shell, complicated flow and interactions of many objects. A 2-D example was simulated and compared with the results in reference to prove the validity of the coupling code. Simulations on global and ellipsoidal explosion vessel yielded consistent results with experiments, proving that this program was valid to simulate the flow structure loaded by a blast wave from a central charge.