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Using computational fluid dynamics ( CFD ) , the local heat transfer between the adjoining shielding gas , laser-induced melt pool and surrounding heat affected zone is estimated .
 process characterization: computational fluid dynamics; application: CFD; concept or principle: heat transfer; concept or principle: gas; material: melt pool; concept or principle: heat affected zone
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, CFD, heat transfer, gas, melt pool, heat affected zone 
Answer:
 process characterization: computational fluid dynamics; application: CFD; concept or principle: heat transfer; concept or principle: gas; material: melt pool; concept or principle: heat affected zone