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This paper presents the computational fluid dynamics modeling of an additive manufacturing process that is candidate for the production of Gen IV nuclear reactor fuels .
 process characterization: computational fluid dynamics; manufacturing process: additive manufacturing process; manufacturing process: production; machine or equipment: Gen IV
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: 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} 
 Entities: computational fluid dynamics, additive manufacturing process, production, Gen IV 
Answer:
 process characterization: computational fluid dynamics; manufacturing process: additive manufacturing process; manufacturing process: production; machine or equipment: Gen IV