基于动网格与UDF技术的流量开关仿真设计

Simulation Design of Flow Switch Based on Dynamic Mesh and UDF Technology

为解决非稳定流排水过程流量信息不能准确预报的问题,设计了一种干簧管流量开关。基于数值仿真软件Fluent提供的计算方法和物理模型,利用动网格和UDF技术(用户自定义函数),采用全面试验方法,研究了流量开关阀瓣在不同含气率条件下的运动特性。仿真结果表明,流量开关阀瓣在高含气率、小流速条件下保持在起始位置振荡,在低含气率、大流速能保持较高的平衡位置。试验结果与仿真结果趋于一致,验证了数值模型的可靠性,流量开关对非稳定流的高含气率排水状态具有很好的鲁棒性,解决了排水初始状态和结束状态流量信息的误报问题,对海洋机器人排水自动化具有重要意义。

In order to solve the problem that the flow rate information cannot be accurately predicted in the process of unsteady flow drainage,a flow rate switch for dry reed tube was designed.Based on the calculation method and physical model provided by the numerical simulation software Fluent,dynamic mesh and UDF technology(user-defined function)were used to study the motion characteristics of the flow switch disc under different air holdup conditions.The simulation results show that the flow switch disc oscillates at the starting position under the conditions of high gas content and low flow rate,and can maintain a high equilibrium position under the conditions of low gas content and high flow rate.The simulation results are consistent with the experimental results,the reliability of the numerical model is verified,and the flow switch has good robustness for the high gas content drainage state of unsteady flow.It solves the problem of misstatement of flow information in the initial state and the end state of drainage,which is of great significance to the automation of ocean robot drainage.