混凝土流场的简易化拟流固两相模型

针对组成复杂的混凝土流固多相流体建模及求解的难题,提出简易化拟流固两相流场的数值模拟方法.即将混凝土中颗粒物(石子与沙砾)近似处理成拟流体相,在欧拉欧拉模型的基础上,两相拥有各自的动量方程和连续方程以求解,相间通过压力相、体积系数和液面交换系数耦合,实现了对组成复杂的混凝土多项流体的简易化拟流固两相流场数值模拟.将此模型用于混凝土搅拌运输车搅拌筒数字化设计过程中,为提高搅拌性能提供了定量化、可视化的设计模型.同时,通过实验结果,间接验证拟流固两相模型的正确性.

Simplified Numerical Simulation in Concrete Multi phase Mixing Drum Based on Quasi fluid solid Two fluid Model

To simulate concrete composed of fluid solid multi phase flow,a simplified numerical simulation based on quasi fluid solid two fluid model is put forward.It regards the particulate matter in concrete (stones and gravel) asquasi fluid flow .Based on the Euler Euler model,each phase has its own momentum equation and continuity equation.The coupling coefficient of each phase is solved through pressure,volume exchange coefficient and surface coefficient and the simplified numerical simulation in concrete multi phase mixing drum is realized.In the numerical mixing drum design process,this method provides a quantized,visualized design model for improving the mixing performance.By the test,the model proves sound indirectly.