how to lessen initial residuals of pressure?

immortality · February 23, 2013, 03:20

i had high initial residual of Uy and p.i fined the mesh in y direction more and Uy decreased now and is good.what can i do about p to decrease its residuals now?
I've lowered Co but didn't affect p.what to do?

immortality · February 26, 2013, 17:55

all idea's are appreciated,is p residual related to mesh like U?or time step?what solver or scheme or anything else affect on residuals of p?

immortality · March 8, 2013, 04:23

it'll be a valuable to documet thread if it has some nice remarks and ideas.

immortality · March 29, 2013, 01:17

does anyone have any opinion about factors have effect on p residuals?

arsalan.dryi · February 19, 2016, 07:02

Hi Ehsan,
Did you find any solution for decreasing initial residual of p_rgh ?

Thanks.

immortality · February 20, 2016, 08:52

Hi Arsalan
yes sure

but don't remember how exactly. I think it was due to BC. I'll see and tell you if found more

arsalan.dryi · February 20, 2016, 12:44

Hi Ehsan
Thank you very much for your attention.
Could you explain to me the importance of initial residual in a transient problem?
I'm a bit confused about identifying the convergence criteria and solution quality in my transient simulations.

Best regards,
Arsalan.

February 23, 2013, 03:20	how to lessen initial residuals of pressure?	#1
immortality Senior Member Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,208 Rep Power: 26	i had high initial residual of Uy and p.i fined the mesh in y direction more and Uy decreased now and is good.what can i do about p to decrease its residuals now? I've lowered Co but didn't affect p.what to do?

February 20, 2016, 08:52		#6
immortality Senior Member Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,208 Rep Power: 26	Hi Arsalan yes sure but don't remember how exactly. I think it was due to BC. I'll see and tell you if found more arsalan.dryi likes this. __________________ Injustice Anywhere is a Threat for Justice Everywhere.Martin Luther King. To Be or Not To Be,Thats the Question! The Only Stupid Question Is the One that Goes Unasked.

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
AMI speed performance	danny123	OpenFOAM	21	October 24, 2020 04:13
problem with Min/max rho	tH3f0rC3	OpenFOAM	8	July 31, 2019 09:48
pimpleFoam: turbulence->correct(); is not executed when using residualControl	hfs	OpenFOAM Running, Solving & CFD	3	October 29, 2013 08:35
SLTS+rhoPisoFoam: what is rDeltaT???	nileshjrane	OpenFOAM Running, Solving & CFD	4	February 25, 2013 04:13
Full pipe 3D using icoFoam	cyberbrain	OpenFOAM	4	March 16, 2011 09:20

February 26, 2013, 17:55		#2
immortality Senior Member Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,208 Rep Power: 26	all idea's are appreciated,is p residual related to mesh like U?or time step?what solver or scheme or anything else affect on residuals of p?

March 8, 2013, 04:23		#3
immortality Senior Member Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,208 Rep Power: 26	it'll be a valuable to documet thread if it has some nice remarks and ideas.

March 29, 2013, 01:17		#4
immortality Senior Member Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,208 Rep Power: 26	does anyone have any opinion about factors have effect on p residuals?

February 19, 2016, 07:02		#5
arsalan.dryi Member Arsalan Join Date: Jul 2014 Posts: 74 Rep Power: 11	Hi Ehsan, Did you find any solution for decreasing initial residual of p_rgh ? Thanks.

February 20, 2016, 12:44		#7
arsalan.dryi Member Arsalan Join Date: Jul 2014 Posts: 74 Rep Power: 11	Hi Ehsan Thank you very much for your attention. Could you explain to me the importance of initial residual in a transient problem? I'm a bit confused about identifying the convergence criteria and solution quality in my transient simulations. Best regards, Arsalan.