how to lessen initial residuals of pressure?

immortality · February 23, 2013, 04:20

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, 18:55

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, 05:23

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

immortality · March 29, 2013, 02:17

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

arsalan.dryi · February 19, 2016, 08:02

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

Thanks.

immortality · February 20, 2016, 09:52

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, 13:44

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, 04:20	how to lessen initial residuals of pressure?	#1
immortality Senior Member Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,208 Rep Power: 28	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, 09:52		#6
immortality Senior Member Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,208 Rep Power: 28	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.

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February 26, 2013, 18:55		#2
immortality Senior Member Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,208 Rep Power: 28	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, 05:23		#3
immortality Senior Member Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,208 Rep Power: 28	it'll be a valuable to documet thread if it has some nice remarks and ideas.

March 29, 2013, 02:17		#4
immortality Senior Member Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,208 Rep Power: 28	does anyone have any opinion about factors have effect on p residuals?

February 19, 2016, 08:02		#5
arsalan.dryi Member Arsalan Join Date: Jul 2014 Posts: 74 Rep Power: 13	Hi Ehsan, Did you find any solution for decreasing initial residual of p_rgh ? Thanks.

February 20, 2016, 13:44		#7
arsalan.dryi Member Arsalan Join Date: Jul 2014 Posts: 74 Rep Power: 13	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.