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Reduce flow rate when specified max pressure reached at inlet

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Dear All,

I would like to have reductions of flow rate whenever specified max pressure reached over time. At inlet boundary, the flow rate starts with 0.25 [gal/min]. Afterwards, the inlet pressure builds up over time. Whenever a specified inlet max pressure is reached (say 340 [Pa]), the inlet flow rate must be reduced (slightly below 0.25[gal/min], say 0.24 [gal/min]). Again, if the inlet pressure reaches the specified inlet max pressure (340 [Pa]), the flow rate must be reduced once again (slightly below 0.24[gal/min], say 0.23[gal/min]). Therefore, the operation continuously goes again and again like this reduction of flow rate.

I thought COMSOL will handle my simple expression, but unfortunately not. I wrote at fully developed flow rate inlet boundary condition as; if(maxop1(p)<=340[Pa], q_in, q_in==q_in-0.01)

where; q_in is 0.25[gal/min]. maxop1(p) is the maximum pressure reading at the inlet boundary.

I hope my problem is clear. Any further inquiry, I will respond. I appreciate your time reading and responding my message, thanks.



0 Replies Last Post 23 ott 2018, 16:14 GMT-4
COMSOL Moderator

Hello Rami Albattat

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