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-   -   The backflow hydraulic diameter of a double volute centrifugal pump (https://www.cfd-online.com/Forums/fluent/167538-backflow-hydraulic-diameter-double-volute-centrifugal-pump.html)

Ahmed Saeed Mansour March 3, 2016 20:51
The backflow hydraulic diameter of a double volute centrifugal pump
 
How can I calculate the backflow hydraulic diameter of a double volute centrifugal pump to enter it in the boundary conditions in Fluent?

https://www.google.com.eg/search?q=d...u0CvytI4X9M%3A

LuckyTran March 5, 2016 19:55
What you need to specify is the turbulence in case there is reverse flow. It may help to think of it as your k and epsilon or k and omega.

Note that if there is not any reverse flow (which I don't think there should be in a pump) then the backflow properties will never be used except at intermediate iterations.

Ahmed Saeed Mansour March 7, 2016 05:34
Quote:
Originally Posted by LuckyTran (Post 588229)
What you need to specify is the turbulence in case there is reverse flow. It may help to think of it as your k and epsilon or k and omega.

Note that if there is not any reverse flow (which I don't think there should be in a pump) then the backflow properties will never be used except at intermediate iterations.
I know that the hydraulic diameter is 0.015 m but I don't know what is the formula to know how to calculate it?


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