Is calculated friction factor same with Sand Grain Roughness ?

    • sinan ozbolgili

      Hi all, 
      I am tringt o modelling water flow in pipe. 

      Just want to know is calculated friction same with Sand Grain Roughness . I mean I am calcuatin frciton factor based on belo formulation. 

      f = (1.58 *lnRe – 3.28)^(–2)

      So. shoul I enter result of above formulation to rougness height or roughness constant as input? 


    • SRP


      I urge you to read the ansys fluent user's guide:: 7.4.15. Wall Boundary Conditions (ansys.com)

      It will help you to set values of roughness height and roughness constant.

      Thank you.

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