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Closure problem A closure problem arises in the Reynolds-averaged Navier-Stokes ( RANS ) equation because of the non-linear term \ overline from the convective acceleration , known as the Reynolds stress , Closing the RANS equation requires modeling the Reynold 's stress R _ .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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