Mohthesham,
Can you clarify where the overflow pipe is? See below comment in red:
As water first reaches the overflow pipe, it may "spill" into it and act as weir flow, and then when the depth is high enough it would act as orifice flow. However…
If the dry condition is expected then these initial unstable results could be okay if you see stable results after you progress through the simulation. Is the HGL improving when the conduits are "not" running dry? Are you seeing stable results later in…
A couple more points to add to Scott's response:
It appears that you may be viewing time zero when the pipes are dry. The hydraulics tend to not be as stable during such dry periods, so you may want to advance forward in time, using the Time Browser…
Hello Mohthesham,
First, make sure that you the start and stop nodes for the conduits are correct, as mentioned in this link . Based on the symptoms, I am not sure this is part of the issue, but it is worth checking.
I assume that this is occurring…