I am too lost for the document of CFX4.3. At the page 3-267, it says Gidaspow dense concentration model is used for all volume fractions if the 'Ergun' keyword is used. But the Ergun's law is for fixed bed, does it mean the Ergun's law is used for all volume fractions, or the wen and yu's law is used for all? If the latter is right, the keyword 'Ergun' is not appropriate here.
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