Tank's out net doesn't work

Question

Hi all. I have a problem with my network simulation. In my water distribution network, I have 1 Tank with 1 inlet and 3 outlets. The problem is why the water doesn't flow through the tank? In other word my outlet values always show negative and zero. Can anyone help me? Thanks before.

MPachlhofer · Accepted Answer

Alden, 
 
In this situation it would help us to see your model files. There are two options for sharing your model files on Communities. If you would like the files to be visible to other members, compress the files into a zip file and upload them as an attachment using the ‘Advanced Reply editor’ before posting. If your data is confidential, you can follow the instructions in the link below to send it to us via Bentley Sharefile. Files uploaded to Sharefile can only be viewed by Bentley. 
 
 communities.bentley.com/.../7079.be-communities-secure-file-upload 
 
Regards, 
Mark

Wayne Hartell · Answer

Hi Alden,

I'm looking at tank T-9 and I see that it reaches 100% full and stays at that level. The three outlet pipes are connected to down-stream nodes, but none of them have any demands on them, that I can see, thus the flow out of the tank will be zero. The hydraulic computation is based on a demand driven model(flows are specified/known and hydraulic grades/losses are calculated). If you wish to model demands as a function of pressure you could consider using emitter flows or pressure dependent demands. The former is the easiest to model, whilst the latter provide more advanced capabilities.

Regards,
Wayne.