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The framework combines a powder packing model based on Discrete Element Method and a 3-D transient heat and fluid flow simulation .
 framework, powder, model, Discrete Element Method, 3-D, heat, fluid 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:
 framework, powder, model, Discrete Element Method, 3-D, heat, fluid flow