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The backflow hydraulic diameter of a double volute centrifugal pump

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Old   March 3, 2016, 21:51
Default The backflow hydraulic diameter of a double volute centrifugal pump
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How can I calculate the backflow hydraulic diameter of a double volute centrifugal pump to enter it in the boundary conditions in Fluent?

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Old   March 5, 2016, 20:55
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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.
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Old   March 7, 2016, 06:34
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Quote:
Originally Posted by LuckyTran View Post
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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