help in pressure drop calculation in fluent
hi everyone
i want to calculate the pressure drop of fluid along a pipe with anuular section ,in result i see that the pressure drop that fluent give me is 200 pa less than exact pressure drop that it must be.. what is the reason for that?? lenght = 12 ft D_out = 2.91 in D_in=1.8 in mesh 2,600,000 out let boundary = 0 pressure inlet boundary= velocity inlet fluid =water for water inlet with velocity INLET 1.58 i receive 1100 pa/m pressure drop but it must be more. tnx for any help 
Have you set roughness in wall boundaries?

hi
yes roughness constant as a default is 0.5 i dont know when i do it by one liquid, result is little lower and when i use liquidsolid, pressure drop it twice the exact result !! :( 
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Did find the solutin about this problem? I have the same problem. Please let me know if you have solved it. 
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