I am having one tank which is getting water from reservoir.
While running EPS for 24 hrs., I am getting an error of the "Tank is Empty" at around 21:00 hrs.
I have placed FCV at the inlet of the tank, with the initial setting of flow equals to the total demand at the D/s node of the tank.
Also, the initial level in the tank gives that the tank is 30 % full at the start of the simulation.
The Velocity in the inlet pipe is around .98 m/s, HLG is below 5 m/km, and the Required HGL is available at the tank throughout 24 hrs.
What shall I do if the tank is showing empty ?
What will you have in the real system that will prevent the tank from becoming empty? For example if the demand on a particular day is much more than usual and the tank drains faster, what will happen to ensure that it does not become empty? Typically you would have controls in place that monitor the tank level and either turn on/off an upstream pump (if the source is at a lower elevation), or open and close a valve (if the source is at a higher elevation and feeds the tank by gravity). See the following article in our wiki for more information on controls:
Creating Controls - Conditions, Actions, and Control Sets (CONNECT Edition and V8i SELECTseries 6)
Chetan Topre said:I have placed FCV at the inlet of the tank, with the initial setting of flow equals to the total demand at the D/s node of the tank.
If your demands have a diurnal pattern applied, then the demand at a particular timestep may be greater than the sum of the downstream base demands (if the pattern multipliers are greater than 1.0) and if the FCV was set to the sum of the base demands, then the downstream demand and tank outflow may be greater than the FCV setting at some times, and thus drain the tank. Try graphing flow in the pipe downstream of the tank.
If you have put measures in place to ensure that the tank does not become empty and you still need help, then as Sushma mentioned, it may be best to see a copy of the model.
Regards,
Jesse DringoliTechnical Support Manager, OpenFlowsBentley Communities Site AdministratorBentley Systems, Inc.