Problem with the continuity error

ycui · February 20, 2018, 13:16

I run simulations with two different flow rates, one has the continuity error as following:

[0] --> FOAM FATAL ERROR:
[0] 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 : 0.00019934231
Specified mass inflow : 0.00050030965
Specified mass outflow : 0.00050030965
Adjustable mass outflow : 0

My mass inflow and outflow are identical, why I recieved this error

Another simulation with a different flow rate runs smooth, all settings are the same.

ycui · February 21, 2018, 09:15

I solve the problem by freeing one outlet, i.e. set one velocity outlet as zeroGradient and the corresponding outlet pressure is changed into the fixedValue.
The idea is to adjust the volume flow rate by OpenFoam itself, in order to avoid the tolerance of numerical error.

February 20, 2018, 13:16	Problem with the continuity error	#1
ycui New Member Join Date: Nov 2016 Posts: 16 Rep Power: 11	I run simulations with two different flow rates, one has the continuity error as following: [0] --> FOAM FATAL ERROR: [0] 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 : 0.00019934231 Specified mass inflow : 0.00050030965 Specified mass outflow : 0.00050030965 Adjustable mass outflow : 0 My mass inflow and outflow are identical, why I recieved this error Another simulation with a different flow rate runs smooth, all settings are the same.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
[OpenFOAM.org] compile error in dynamicMesh and thermophysicalModels libraries	NickG	OpenFOAM Installation	3	December 30, 2019 01:21
DPM udf error	haghshenasfard	FLUENT	0	April 13, 2016 07:35
[OpenFOAM] Native ParaView Reader Bugs	tj22	ParaView	270	January 4, 2016 12:39
POSDAT problem	piotka	STAR-CD	4	June 12, 2009 09:43
user subroutine error	CFDUSER	CFX	2	December 9, 2006 07:31

February 21, 2018, 09:15		#2
ycui New Member Join Date: Nov 2016 Posts: 16 Rep Power: 11	I solve the problem by freeing one outlet, i.e. set one velocity outlet as zeroGradient and the corresponding outlet pressure is changed into the fixedValue. The idea is to adjust the volume flow rate by OpenFoam itself, in order to avoid the tolerance of numerical error.