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In this study , conventional principles of casting hydrodynamics is advanced by validated novel numerical models for novel sprue designs to improve melt flow control .
 casting, sprue, designs, melt flow
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 casting, sprue, designs, melt flow