[renyun0511]

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

[waynezw0618]

Originally Posted by renyun0511

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

I will send you my utilities. which i remember i have ever send it to you before

[Santana]

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

[aldo.iannetti]

Originally Posted by waynezw0618

I will send you my utilities. which i remember i have ever send it to you before

Hi
can you please send me your utilities to write relative velocity in MRFSimpleFoam?
Thanks
Aldo

[renyun0511]

Originally Posted by aldo.iannetti

Hi
can you please send me your utilities to write relative velocity in MRFSimpleFoam?
Thanks
Aldo

Attachment 6480

Good Luck

jennifer

[renyun0511]

Originally Posted by Santana

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

Attachment 6481
Good Luck

jennifer

[linnemann]

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]

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.

[sharonyue]

Originally Posted by linnemann

Here is one that works for OF-2.2.x

Thanks very much linnemann! Its beautiful!

Regards

[renyun0511]

Originally Posted by linnemann

Here is one that works for OF-2.2.x

Hi, Linnemann,

Do you have the Urel Utilities for OF-2.1.0?

Thanks,

Yun Ren

[renyun0511]

Sorry, Ithink I find it. I ignored your upper message!

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

[sharonyue]

Originally Posted by linnemann

Here is one that works for OF-2.2.x

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!

[linnemann]

Hi see post

http://www.cfd-online.com/Forums/ope...tml#post427929

[Lisandro Maders]

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

[Nolwenn]

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 :

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

[linnemann]

Hi

it should not be "MRFProperties.txt" but "MRFProperties"

[Nolwenn]

Hi Niels,

Silly me ! Thank you, it works perfectly.

Nolwenn

[Maff]

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.

[Seroga]

Can anybody tell to newbie how to install this utility?

[macRC]

Can anybody tell to newbie how to install this utility?


No one?