I have checked but cant seem to find a problem, please suggest what is the issue many of my pipes are showing 0 flow.
And is the tank specs correct in my network please checkonce, i have a tank with GL 197, at a height 0f 25m from ground and has flow coming in for which ihave used negative flow junction as suggested by bentley support.
And the hydraulic grade is also very similar at all the junctions is that a problem?
I am attaching my model
Hello Rahul,
Flow is not 0 in the pipes, if the flow had been zero you will not see flow arrows for the pipes after computing the model.
If you look at the pipe graphs, you will see that the display precision is set to zero for flow results, if you change the display precision to >0 like 3,4 decimals, right click on flow result in pipe properties > units & formatting > decimals, you will see flow in the pipes, which is less than 1 L/s for most of the pipes.
About tank modeling, if the tank is 25 m above GL 197 then the figures look correct, which says tank water elevation is 232 m.
About modeling negative demand at junction before tank, are you forcing fixed inflow into the system from a fixed source?
Regards,
Sushma Choure
Bentley Technical Suppport
ok if its not zero then why are they so low,
Yes i am forcing inflow using negative demand because i had to model an inflow from source,
as suggested by Mr scott Kampa(https://communities.bentley.com/products/hydraulics___hydrology/f/haestad-hydraulics-and-hydrology-forum/217868/having-problem-in-simulating-oht-inflow/665395#665395)
Apart from this does everything look fine? Because i have not used forced inflow before, so i am not sure if i did it correctly conceptually.
So please suggest if anything can be done better.
Thanks &Regards
What kind of system you are modeling here? There are no fluctuations in the elevation, so unless there is another hydraulic element in the model the HGLs would be in the similar range as pressure.
What do you mean by flows are slow could you please elaborate?
It appears to be a closed loop system that you are modeling. There is hydraulic pattern defined however you are using fixed demand pattern.
Just to add - the flow in the pipes is low because the demands in this closed system are low. All of them are set to 0.16 gpm. The total demand in the system is 80 gpm but because of the extensive looping, the flow has many paths to take and is therefore relatively low in each pipe.
Jesse DringoliTechnical Support Manager, OpenFlowsBentley Communities Site AdministratorBentley Systems, Inc.
Sushma Choure said:What kind of system you are modeling here? There are no fluctuations in the elevation
Yes the elevations have very less fluctuations as its a pressurized network so there is not much elevation difference,