Meshfree modeling of near field two-liquid mixing process in the presence of different obstacles

摘要

In this research two-liquid dam break induced mixing process in the presence of different obstacles was modeled using delta-SPH method. Water and polyetilenoxid (PEO) were used as two different Newtonian fluids. The model was validated using laboratory data, including single-liquid dam break over wet bed and over triangular and rectangular obstacles as well as two-liquid dam break. Then, the effect of various parameters such as ambient water depth and gate motion characteristics on mixing pattern and front propagation of water-PEO interface were investigated. The results show the necessity of considering the gate in numerical simulation. Furthermore, a two-step formula for gate motion consisting accelerated phase and a uniform velocity phase was used leading to increasing the accuracy of the results. Finally, the flow simulation was performed to evaluate and compare the mixing pattern, front propagation of water-PEO solution interface as well as maximum flow height in the presence of three different obstacles.