Time step continuity error on restart

akidess · August 23, 2010, 07:53

Hello everybody,

I have a solver I developed based on interFoam (1.6.x). It works like a charm running from t=0, but if I try to restart a simulation at an arbitrary t!=0 I get a time step continuity error. Any idea how to fix this? I already tried changing the 'writePrecision' in controlDict from 6 to 10, but that didn't help.

- Anton

Code:

time step continuity errors : sum local = 6.660168758e-11, global = 6.639932847e-11, cumulative = 6.639932847e-11

--> FOAM FATAL ERROR: 
Continuity error cannot be removed by adjusting the outflow.
Please check the velocity boundary conditions and/or run potentialFoam to initialise the outflow.
Total flux              : 1.43477e-07
Specified mass inflow   : 1.17455e-13
Specified mass outflow  : 2.17053e-13
Adjustable mass outflow : 0

akidess · August 23, 2010, 08:40

I forgot to mention that this happens right after reading the transport properties, ie. before any computations are done. Also, all boundary conditions for U are fixedValue 0, and for p are zeroGradient.

Now I noticed the solver is unhappy with the call to adjustPhi in correctPhi.H using pCorr. If I remove the include for correctPhi.H, the solver seems to run as it should, but I don't really understand why this breaks things... Can anyone provide an insight if it is safe to remove this initialization?

Tiffany · August 15, 2012, 19:05

I'm getting this exact same error. Did you figure out how to fix this???

akidess · August 16, 2012, 02:38

A possible fix is already mentioned in my post #2.

Tiffany · August 16, 2012, 11:50

Sorry, I meant did you find a way to fix this error without editing the solver (i.e. removing the include for correctPhi.H)? I'm getting this error when trying to run interFoam and don't want to attempt to edit the solver to run my case for obvious reasons. I'm wondering what setting(s) I can change to get this to work for me.

akidess · August 17, 2012, 01:54

Unfortunately that's the only solution I found.

August 23, 2010, 07:53	Time step continuity error on restart	#1
akidess Senior Member Anton Kidess Join Date: May 2009 Location: Germany Posts: 1,377 Rep Power: 29	Hello everybody, I have a solver I developed based on interFoam (1.6.x). It works like a charm running from t=0, but if I try to restart a simulation at an arbitrary t!=0 I get a time step continuity error. Any idea how to fix this? I already tried changing the 'writePrecision' in controlDict from 6 to 10, but that didn't help. - Anton Code: time step continuity errors : sum local = 6.660168758e-11, global = 6.639932847e-11, cumulative = 6.639932847e-11 --> FOAM FATAL ERROR: Continuity error cannot be removed by adjusting the outflow. Please check the velocity boundary conditions and/or run potentialFoam to initialise the outflow. Total flux : 1.43477e-07 Specified mass inflow : 1.17455e-13 Specified mass outflow : 2.17053e-13 Adjustable mass outflow : 0

August 16, 2012, 02:38		#4
akidess Senior Member Anton Kidess Join Date: May 2009 Location: Germany Posts: 1,377 Rep Power: 29	A possible fix is already mentioned in my post #2. __________________ On twitter @akidTwit Spend as much time formulating your questions as you expect people to spend on their answer.

August 17, 2012, 01:54		#6
akidess Senior Member Anton Kidess Join Date: May 2009 Location: Germany Posts: 1,377 Rep Power: 29	Unfortunately that's the only solution I found. __________________ On twitter @akidTwit Spend as much time formulating your questions as you expect people to spend on their answer.

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August 23, 2010, 08:40		#2
akidess Senior Member Anton Kidess Join Date: May 2009 Location: Germany Posts: 1,377 Rep Power: 29	I forgot to mention that this happens right after reading the transport properties, ie. before any computations are done. Also, all boundary conditions for U are fixedValue 0, and for p are zeroGradient. Now I noticed the solver is unhappy with the call to adjustPhi in correctPhi.H using pCorr. If I remove the include for correctPhi.H, the solver seems to run as it should, but I don't really understand why this breaks things... Can anyone provide an insight if it is safe to remove this initialization? Last edited by akidess; August 23, 2010 at 10:00. Reason: Added more information

August 15, 2012, 19:05		#3
Tiffany New Member Anonymous Join Date: Aug 2012 Posts: 8 Rep Power: 13	I'm getting this exact same error. Did you figure out how to fix this???

August 16, 2012, 11:50		#5
Tiffany New Member Anonymous Join Date: Aug 2012 Posts: 8 Rep Power: 13	Sorry, I meant did you find a way to fix this error without editing the solver (i.e. removing the include for correctPhi.H)? I'm getting this error when trying to run interFoam and don't want to attempt to edit the solver to run my case for obvious reasons. I'm wondering what setting(s) I can change to get this to work for me.