Dear All,
With Greetings and Regards
I am working on a water transfer project with the following specifications:
A drinking water transmission tunnel with a length of 19 km and a finished diameter of 4.5 meters with a positive slope, the end of which is about 12 meters higher than the beginning, and a intake shaft with a height of about 30 meters at the beginning of it is considered. Water is poured into this shaft from top and the shaft is responsible for providing the head for the pressurized flow in the tunnel. At the end of this tunnel, in order to maintain the flow under pressure in the entire length of the tunnel, an Ogee weir is considered with the height equal to depth of tunnel, which the water overflows on it and is transferred to the outside of the tunnel. In order to determine the diameter of the initial shaft, it is necessary to check the condition of the unsteady flow in the tunnel at the time of shutdown and start of the incoming flow in order to determine the appropriate diameter of the shaft.
1-Could such case be modeled using commercial softwares such as Hammer or AFT?
2-Do these softwares correctly model the behavior of the shaft and such long tunnel?
3-How can one be sure of the correctness of this model's answer?
4-Is there a similar project to verify the results?
5-Regarding the Hammer software, is it correct to consider Tank for the initial shaft and the Discharge to Atmosphere with the setting of Rating Curve as the end weir?
6-Is this a case of mass oscillation?
It will be very kind of you if you could help me in this matter and I would be very grateful for your attention.
I am looking forward to hearing from you
Best wishes
Dear Mostafa
water hammer or mass oscillation depends on the rate of flow variation , if it is slow then mass oscillation
if the filling rate in the discharge tunnel is low < 70 % then you can consider the weir as boundary condition otherwise you have to consider both ascending and descending tunnels in simulation as two phase transient may occur in the second stretch
any commercial software can fill the needs , AFT , Hytran , Hammer , or Wanda
good luck
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