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Darcy Weisbach roughness

I entered the the Darcy Welsbach roughness heights for my pipes but after doing some research I found out that the roughness can be negligible in certain depending on the Reynolds number. So I ran my scenarios with all the roughness's set to zero to see how that would impact my results and I noticed it had no impact compared to when I used the roughness associated with the pipe materials. This would indicate to me that the roughness heights are negligible in my my situation. Is that a correct assumption? 

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  • If the Hazen-Williams method is selected in the calculation options, you should only see the Hazen-Williams C field in the pipe properties. I am guessing you may have added the Darcy-Weisbach roughness height field to a pipe Flextable and were using that. 

    To answer the general question - the friction factor will certainly impact the results as it will change the friction headloss, but there are some cases where that headloss could be "negligible" for example if the velocity is very low in the pipe. 

    Is there a deeper reason why you are asking this question, or is it just for academic curiosity?


    Regards,

    Jesse Dringoli
    Technical Support Manager, OpenFlows
    Bentley Communities Site Administrator
    Bentley Systems, Inc.

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