管路における乱流過渡流れの最適化有限要素モデルによるシミュレーションに関する研究

抄録

An optimized finite element model is applied to simulation of turbulent transient flow in pipes. The turbulent friction is a nonlinear function of flow rate. It can be evaluated without linearization when using the optimized finite element model. The model is written as a state space equation, whose coefficient matrices are obtained on the assumption of non-loss pipes. A turbulent friction term is introduced into the model as an augmented block. The turbulent friction block is a combination of a block of the square of the flow rate and a block of a frictional coefficient. The model can be applied to simulation-tool software such as simulink. Experiments are carried out using an open-end pipe. Simulated results are compared with experimental results to reveal the accuracy.