[marivold]

Hi

I am making a spillway tutorial for students, based on this case http://www.hpc.ntnu.no/display/hpc/O...singinParaview, but modified to make the weir look like a proper one.

I forgot to make sure that the initial alpha values were correct (setFieldsDict), which resulted in a weird looking block of water hanging in the air at the downstream side of the weir at time step 0, but it splashed down nicely and did not affect the simulation. However since it looked amateurish, I wanted to change it so the water would be contained upstream of the weir at the initial stage.

Sadly, interFoam crashes every time now. First I get several warnings like this:

--> FOAM Warning :
From function Time: : operator++()
in file db/Time/Time.C at line 1055
Increased the timePrecision from 11631 to 11632 to distinguish between timeNames at time 1.456270037
Time = 1.456270036763853248373834503581747412681579589843 75

I have tried increasing timePrecision in controlDict and many other different things, but so far I have failed. I do not have a lot of experience using OpenFOAM, so help would be very much appreciated!

Does anyone have an idea of why I get these warnings and what I can do to fix it? Files attached, let me know if there is something missing that is of interest.

[MSF]

Hello,

your time step is set so your max Co-Number is lower than 0.5 (see Control Dict), if you have some error and your velocity u grows fast delta t is also reduced fast. In your case the time step is way too small. To distinguish between two time steps OpenFoam increases timePrecision. But this is just a syndrome and not your error. Further increasing timePrecision wont help - the error is somewhere else.

Greetings

[vatavuk]

Hi Marivold,

The spillway tutorial was developed for version 2.1. In version 2.3, there were several modifications to interFoam. I spent some time to make the tutorial run in version 2.3.

If anyone is interested, the file is attached below.

Best Regards,
Paulo