The concentration at the stop node directly after a constituent source in a tank is decreasing rapidly

   
  Applies To 
   
  Product(s): Bentley WaterCAD, Bentley WaterGEMS, Bentley HAMMER
  Version(s): 08.11.XX.XX
  Environment:  N/A
  Area:  Output and Reporting
  Subarea: 
  Original Author: Mark Pachlhofer, Bentley Technical Support Group
   

 

 

 

 

 

 

 

 

Problem

The concentration of my constituent in the pipe that is directly downstream of my tank, which is my concentration source for the model, shows the concentration increasing and decreasing in a spikey manner at the stop node, but the concentration should be the same as the starting concentration at the tank. Why is this happening?

Solution

This issue might occur if the concentration source type of tank is set to "Concentration" . Yes, this source type fixes the concentration of any external inflow entering the network, but it only does so for a flow from a reservoir or from a negative demand placed at a junction. For a tank you will want to use the constituent source type of "setpoint booster",  "flow paced booster", or "mass booster". You can read more about the differences between these source types in the wiki article under the "See Also" section below.

See Also

What is the difference between the different constituent source types used for a constituent analysis?

 

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  • When: Thu, Jan 29 2015 2:01 PM
  • Revisions: 1
  • Comments: 0
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