In this network network_00.zip, the orifice is closed and then reopened. The very moment it is reopened, you observe that there is a sudden peak raise in the flow through it. I would attribute this peak to;
- water surging, but this peak looks to high compared to the raise that I would expect.
- numerical instability in the system when the orifice is reopened, but since I am using a hotstart file I find it hard to believe this.
If any one out there could be having an idea on what the cause(s) of this sudden peak raise is (are), please let's share it (the idea).