Numerical simulation for thermal flow filling process of casting
(1.广西壮族自治区南宁市广西大学北京大学化学与化学工程2.陕西省西安市西北工业大学材料科学与工程学院3.山西省太原市北方大学材料科学与工程学院)
Abstract: The solution algorithm (SOLA) method was used to solve the velocity and pressure field of the thermal flow filling process, and the volume of fluid (VOF) method for the free surface problem. Since the “donor-acceptor” rule often results in the free interface vague, the explicit difference method was adopted, and a method describing the free surface state at 0＜F＜1 was proposed to deal with this problem. In order to raise the computation efficiency, such algorithms were investigated and invalidated as: 1) internal and external area separation simplification algorithm; 2) the reducing necessary search area method. With the improved algorithms, the filling processes of the valve cover castings with gravity cast and an up cylinder block casting with low-pressure cast were simulated, the simulation results are believable and the computation efficiency is greatly improved. The SOLA-VOF model and its difference method for thermal fluid flow filling process were introduced.
Key words: thermal flow; numerical simulation; filling process; free surface; computation efficiency