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Turbulence in simulation result

Hi, everyone, 

I use dynamic wave to simulate a piece of pipe network, and I set up the outfall boundary to time series which I measured several months ago.  The outfall  boundary is surcharged when it rains. But after the simulation, I find the total inflow of the node nearby the outfall is violent turbulence. I wonder why it is caused and how can it be solved ? 

figure 1  the depth of the node nearby the outfall, which is approach the measured value

figure 2 the total inflow of the node in the node nearby the outfall, which is violent turbulence. 

figure 3 the outfall boundary I set up, which is actual observed value. 

anyone can help ? 

thanks a lot . 

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Replies

  • You did not mention your time step but normally the easiest way to fix this issue is to lower the hydraulic time step or increase the Maximum Trials.  You might also check the normal flow options and whether there is an offset depth for the link at the outfall.

    • Yes, it is the hydraulic time step that causes the turbulence, and I solved the problem by shortening the time step. 

      Thank you!

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