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How to stabilize hydrograph outflow of a storage |
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January 17, 2015, 05:18 |
How to stabilize hydrograph outflow of a storage
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New Member
RoyDaniel
Join Date: Oct 2014
Location: Taiwan
Posts: 9
Rep Power: 11 |
Dear All Flow 3D Experts,
How are you ? I am hope you are all great in early early start of this new year 2015. I just want to share what I am doing now on Flow 3D modelling. I am trying to creating Storage routing model now. It’s just a simple long rectangular storage with hydrograph inflow in Xmin with peak as much as 6000 cms (please see figure 1a&b Storage). The aim of the model is to see Inflow-Outflow hydrograph like in attachment figure 2 InflowOutflowHydrograph. But when I see from the result at the early second until 8000 second, the hydrograph shows very unstable result. It oscillates so high (please see figure 3, Result Flow 3D). And also following tables are another description about my model. Could any body help me how to smooth or stabilize the Outflow or Xmax hydrograph as shown in figure 3 Result Flow 3D? Table of BC Location BC Symbols Remark Xmin Volume Rate VFr Hydrograph Xmax Outflow P Hydrograph of (surface water level vs time) exactly at the weir Ymin Wall W no water allowed to flow laterally Ymax Wall W no water allowed to flow laterally Zmin Wall W No water allowed to flow down Zmax Pressured P Initially it’s not pressurized flow Table of Mesh Size Direction Mesh Size (m) deltaX 20 deltaY 25 deltaZ 10 Table Time step Time Step Control Time step (sec) Initial Time Step 1E-20 Maximum Time Step 1E-25 Thank you so much for your help Best Regards, Roy |
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flow 3d, hydraulic structures, open channel flow, reservoir |
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