|
[Sponsors] |
how to derive relative velocity in MRFSimpleFoam? |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
December 22, 2009, 22:26 |
how to derive relative velocity in MRFSimpleFoam?
|
#1 |
Member
任芸
Join Date: Jun 2009
Posts: 75
Rep Power: 17 |
hi all,
as we known,the velocity derived from MRFSimpleFoam is absolute velocity,and my problem is that how can i derive relative velocity from it? thanks jennifer |
|
December 22, 2009, 22:42 |
|
#2 |
Senior Member
|
||
June 30, 2010, 13:22 |
|
#3 |
New Member
Sunny William
Join Date: Jun 2010
Location: London
Posts: 6
Rep Power: 16 |
Hello Wayne,
I am simulating an impeller/diffuser stage case and I want to visualize the impeller relative velocity. Could you kindly send me the utility too? Many thanks, San |
|
February 8, 2011, 04:57 |
How to write relative velocity in MRFSimpleFoam
|
#4 |
Member
Aldo Iannetti
Join Date: Feb 2010
Posts: 48
Rep Power: 16 |
||
February 13, 2011, 01:42 |
|
#5 | |
Member
任芸
Join Date: Jun 2009
Posts: 75
Rep Power: 17 |
Quote:
Good Luck jennifer Last edited by renyun0511; November 9, 2011 at 22:10. |
||
February 13, 2011, 01:44 |
|
#6 | |
Member
任芸
Join Date: Jun 2009
Posts: 75
Rep Power: 17 |
Quote:
Good Luck jennifer Last edited by renyun0511; April 20, 2013 at 04:11. |
||
March 22, 2012, 08:31 |
|
#7 |
Senior Member
Niels Nielsen
Join Date: Mar 2009
Location: NJ - Denmark
Posts: 556
Rep Power: 27 |
Hi
I took the liberty of updating it to a more recent version of OF. 1.6-2.1.x to be exact. I can see that from 1.6 and onwards the relativeVelocity have been part of the std MRF files so this makes the code much simpler as it is possible to call the relativeVelocity directly Best
__________________
Linnemann PS. I do not do personal support, so please post in the forums. |
|
May 16, 2013, 04:27 |
|
#8 |
Senior Member
Niels Nielsen
Join Date: Mar 2009
Location: NJ - Denmark
Posts: 556
Rep Power: 27 |
Here is one that works for OF-2.2.x
EDIT: MRF has changed a lot in 2.2 and some solvers are using the MRFProperties file in the constant folder and some are using the system/fvOptions. EDIT2: Just place the MRFProperties file in the constant folder with the same info as the one from system/fvOptions then this new version works.
__________________
Linnemann PS. I do not do personal support, so please post in the forums. Last edited by linnemann; May 29, 2013 at 03:11. |
|
May 16, 2013, 05:17 |
|
#9 |
Senior Member
Dongyue Li
Join Date: Jun 2012
Location: Beijing, China
Posts: 844
Rep Power: 18 |
||
May 17, 2013, 09:23 |
|
#10 |
Member
任芸
Join Date: Jun 2009
Posts: 75
Rep Power: 17 |
||
May 17, 2013, 09:28 |
|
#11 | |
Member
任芸
Join Date: Jun 2009
Posts: 75
Rep Power: 17 |
Sorry, Ithink I find it. I ignored your upper message!
Quote:
|
||
May 27, 2013, 21:16 |
|
#12 |
Senior Member
Dongyue Li
Join Date: Jun 2012
Location: Beijing, China
Posts: 844
Rep Power: 18 |
Hi Linnemann,
Sorry,very late!I just made a plot over line to check this Urel.But its absolutely the same with U,see the image below,Urel(1) and U(1) coincide exactly.and its the same with U(2) Urel(2).Any ideas?Thanks for your reply! |
|
May 29, 2013, 03:10 |
|
#13 |
Senior Member
Niels Nielsen
Join Date: Mar 2009
Location: NJ - Denmark
Posts: 556
Rep Power: 27 |
__________________
Linnemann PS. I do not do personal support, so please post in the forums. |
|
July 8, 2014, 05:07 |
What does Urel do in true?
|
#14 |
Member
Lisandro Maders
Join Date: Feb 2013
Posts: 98
Rep Power: 13 |
Hi,
What does this Urel do in true? Regarding to the calculations done, I could find nothing. Is it just an updating of the mesh inside the MRF zone and then subtracting the velocities values from the "original" one? Regards, Lisandro |
|
September 7, 2014, 09:25 |
|
#15 |
New Member
Nolwenn
Join Date: Apr 2010
Posts: 26
Rep Power: 16 |
Hello,
I compile successfully Urel (OpenFOAM 2.3.x) but when I run Urel after the calculation I see "No MRF models present" and Urel in exactly the same as U. I have no problem with MRF during calculation, in log.simpleFoam I can see : Code:
Creating finite volume options from "system/fvOptions" Selecting finite volume options model type MRFSource Source: MRF1 - applying source for all time - selecting cells using cellZone rotationCellZone - selected 1344433 cell(s) with volume 457.986 I add the MRFProperties.txt to the constant folder, is there something else to do to calculate Urel ? Nolwenn |
|
September 7, 2014, 13:00 |
|
#16 |
Senior Member
Niels Nielsen
Join Date: Mar 2009
Location: NJ - Denmark
Posts: 556
Rep Power: 27 |
Hi
it should not be "MRFProperties.txt" but "MRFProperties"
__________________
Linnemann PS. I do not do personal support, so please post in the forums. |
|
September 7, 2014, 13:25 |
|
#17 |
New Member
Nolwenn
Join Date: Apr 2010
Posts: 26
Rep Power: 16 |
Hi Niels,
Silly me ! Thank you, it works perfectly. Nolwenn |
|
January 13, 2015, 16:08 |
|
#18 |
New Member
Join Date: Mar 2012
Posts: 20
Rep Power: 14 |
I modified the Urel utility so that it reads fvOptions (version 2.3.0).
No need for MRFProperties anymore. I called it "relU" to avoid confusion. |
|
February 5, 2015, 04:58 |
|
#19 |
Member
Seroga
Join Date: Dec 2011
Posts: 41
Rep Power: 14 |
Can anybody tell to newbie how to install this utility?
|
|
June 2, 2015, 09:54 |
|
#20 |
New Member
Domi
Join Date: Feb 2015
Posts: 26
Rep Power: 11 |
Can anybody tell to newbie how to install this utility?
No one? |
|
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
[UDF] Relative coordinates in logarithmic velocity profile | cfdworker | Fluent UDF and Scheme Programming | 25 | July 13, 2017 03:44 |
relative velocity postprocessing | Salman | Main CFD Forum | 8 | July 27, 2009 09:35 |
relative velocity vectors | carno | FLUENT | 0 | May 9, 2008 06:59 |
Variables Definition in CFX Solver 5.6 | R P | CFX | 2 | October 26, 2004 02:13 |
Terrible Mistake In Fluid Dynamics History | Abhi | Main CFD Forum | 12 | July 8, 2002 09:11 |