[joshmccraney]

Hi FOAMers!

Liquid is sucked of a tank, where the velocity at this outlet (suction point) is controlled by a python script. The script changes the entire 4th line below to a different number

    outlet
    {
	type            fixedValue;
        value           uniform (0 -2.6254593e-03 0); 
    }

When I run the script, the volumetric flow rate is off by a lot (simple enough to calculate). However, when I hard code the outlet BC and run it through bash, it runs fine.

THIS IS THE WEIRD PART: after running through bash, when I re-run through python, the volumetric flow rate is perfect. WHAT'S EVEN WEIRDER is after it works fine, if I copy the entire work file and run it again, the same error occurs.

Anyone have any experience with this? Very confusing for me.

[HPE]

have you checked how many decimals were dumped by python and bash separately. should be some syntax error.

[joshmccraney]

Originally Posted by HPE

have you checked how many decimals were dumped by python and bash separately. should be some syntax error.

I have not: how would I do this?

But is this the reason? I copy exactly what the python script writes and I get good results. The odd thing is, after I run it through bash, when I rerun through Python it works fine, and it still pastes over whatever I hardcoded (though it's the same).

[joshmccraney]

UPDATE: the solution was given here. To summarize, disc operations, like reading and writing, can take a very long time compared to the operation of the program, and they run independently of the thread of your program. The solution here is to invoke Popen.wait.

Thanks for the interest!