College of Math and Physics;
Nanjing University of Information Science and Technology;
Nanjing 210044;
China High Temperature Materials Research Laboratories;
University of Science and Technology Beijing;
Beijing 100083;
China National Key Laboratory of Solidification Technology;
Northwestern Polytechnical University;
Xi''an 710072;
China College of Math and Physics;
Nanjing University of Information Science and Technology;
Nanjing 210044;
China;
superalloy; directional; solidification; segregation; fluid; flow;