how to set dynamic vale flow rates

[jinzhuyu]

Hi,

I would like to use dynamic flow rate for a valve. Could you please tell me how to do so? Thanks!

I tried to use "[VALVES] ;ID Node1 Node2 Diameter Type Setting MinorLoss FCV12 12 13 10 FCV 125 0" to set the valve flow rate, but I am not sure how to make specified flow rate change over the simulation steps.

[LRossman]

You can use a set of simple controls to change the FCV setting at specific points in time:

[CONTROLS]
Link FCV12 130 at Time 2  ; Flow setting is 130 at hour 2
Link FCV12 100 at Time 4  ; Flow setting is 100 at hour 4
etc.

[jinzhuyu]

Good morning,

Thank you very much for the quick reponse. I added

"[VALVES] ;ID Node1 Node2 Diameter Type MinorLoss FCV12 12 13 10 FCV 0"

and then

" FCV12 125 at TIME 0 ; Flow setting is 125 at hour 0 FCV12 130 at TIME 1 ; Flow setting is 130 at hour 1"

or

" FCV12 125 at TIME 0 FCV12 130 at TIME 1"

but both led to the following error:

"Error 201: syntax error in [CONTROLS] sections: ‘FCV12 125 at TIME 0 FCV12 130 at TIME 1’.

I tried some variants, but the same error occurred. Can you tell me how to fix the syntax error? Thanks!

On Mon, Jul 8, 2024 at 8:19 AM Lew Rossman @.***> wrote:

You can use a set of simple controls to change the FCV setting at specific points in time:

[CONTROLS] FCV12 130 at Time 2 ; Flow setting is 130 at hour 2 FCV12 100 at Time 4 ; Flow setting is 100 at hour 4 etc.

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[LRossman]

Sorry, I forgot to begin each control with the key word "Link". Please see the corrected post above.