# Boundary Condition for Pump simulation for Zero Head Condition

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 March 26, 2017, 03:25 Boundary Condition for Pump simulation for Zero Head Condition #1 Member   Himanshu Join Date: Jan 2017 Posts: 34 Rep Power: 9 Hello all, I have doubt in boundary condition which should be applied in pump simulation for zero head rise condition( i.e. rise in head total head in flow is zero,∆H=0). This simulation is to draw the performance curve of pump. For the first point of the curve, the ∆H is zero and i have to find what will the volume discharge rate from outlet. Now, I have gone through various journal and papers and I have noted that they use pressure inlet(which is the total pressure) and pressure outlet(which is a static pressure) as boundary condition and they have use both value as Zero. Now, my doubt is that if we see the net head rise formula, ∆H= total pressure at outlet-total pressure at inlet i.e, ∆H=static pressure head at outlet+dynamic pressure head at outlet-total pressure head at inlet. Now, if we substitute the boundary condition on the the equation we get some value of dynamic head at outlet. i.e., ∆H=0+dynamic head at outlet-0 ∆H= dynamic head at outlet hence, we can clearly say that ∆H≠0. Can anyone clarify my doubt or can give any other boundary condition? Sorry for long post and a silly question, I am new to CFD.

 Tags fluent, pump, pump boundary condition, turbo machinery