Is convergence criterion (residual value) related with grid size?

rdeepakkumar · November 3, 2014, 01:14

Please, i need a clarification. Is convergence criterion (residual value) related with grid size? otherwise on which basis we choose the convergence criterion?

LuckyTran · November 5, 2014, 22:59

Cell size doesn't go directly into the calculation of residuals.
But different mesh arrangements will give rise to different solution fields which can change eventually cause different residuals to be calculated. Hopefully the difference is small so that the mesh dependency is negligible.

rdeepakkumar · November 9, 2014, 02:19

Thank you so much for your valuable time..
may i know how the different discretization scheme (order of accuracy) relates with while taking convergence criterion (residual) value. can u elaborate..

November 3, 2014, 01:14	Is convergence criterion (residual value) related with grid size?	#1
rdeepakkumar New Member Join Date: Aug 2011 Posts: 4 Rep Power: 15	Please, i need a clarification. Is convergence criterion (residual value) related with grid size? otherwise on which basis we choose the convergence criterion?

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Floating point exception error	Alan	OpenFOAM Running, Solving & CFD	11	July 1, 2021 22:51
problem with Min/max rho	tH3f0rC3	OpenFOAM	8	July 31, 2019 10:48
should Courant number always be kept below 1?	wc34071209	OpenFOAM Running, Solving & CFD	16	March 9, 2014 20:31
rhoSimplecFoam Mach0.8 no pressure values	CFDnewbie147	OpenFOAM Running, Solving & CFD	16	November 23, 2013 06:58
pimpleFoam: turbulence->correct(); is not executed when using residualControl	hfs	OpenFOAM Running, Solving & CFD	3	October 29, 2013 09:35

November 5, 2014, 22:59		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,754 Rep Power: 66	Cell size doesn't go directly into the calculation of residuals. But different mesh arrangements will give rise to different solution fields which can change eventually cause different residuals to be calculated. Hopefully the difference is small so that the mesh dependency is negligible.

November 9, 2014, 02:19		#3
rdeepakkumar New Member Join Date: Aug 2011 Posts: 4 Rep Power: 15	Thank you so much for your valuable time.. may i know how the different discretization scheme (order of accuracy) relates with while taking convergence criterion (residual) value. can u elaborate..