implementation of schemes in openfoam

venkataramana · June 15, 2011, 00:22

dear all,
i have one question, what is the procedure to make customised schemes in openFoam i mean other than existing schemes in openfoam. i need to implement the schemes like upwind.

thanks in advance

with regards
venkataramana

Bernhard · June 15, 2011, 02:16

Upwind schemes are implemented a long, long time ago, see here how to use them: http://www.openfoam.com/docs/user/fvSchemes.php

venkataramana · June 15, 2011, 02:33

what i mean to say the schemes other than upwind, linear which are available in openFoam, How to develop a new scheme and how to run it.

thanks for your reply,

Bernhard · June 15, 2011, 03:21

I would it something like this: Start from an existing scheme that looks like the one you are looking for, copy them in your own folder, adjust to your wishes, compile into a library, and call that using controlDict from your simulation.

venkataramana · June 15, 2011, 05:38

thank u very much, i will try it

vatavuk · June 15, 2011, 09:20

Hi Bernard,
I have a doubt similar to Venkataramana's. Which file I have to edit to modify the van Leer scheme?
Thanks,
Paulo Vatavuk

akidess · June 15, 2011, 09:37

See vanLeer.H

vatavuk · June 16, 2011, 09:18

Hi Anton,
Thanks for the hint. I’ve been navigating the code documentation for almost one hour, but I can’t find the point were the vanLeerLimiter class is instantiated. I want to understand were the LimitedScheme parameter is defined. I’ve been studying C++ for some time but I’m still thinking in the FORTRAN way. Can you help me?
Thanks,
Paulo

akidess · June 21, 2011, 02:37

It's a bit tough to find where it is instantiated because the trail breaks due to the use of macros. If you just want to implement a different limiter, just stick to vanLeer.H (updated link) and edit the limiter function there.

venkataramana · June 21, 2011, 05:01

Quote:

Originally Posted by Bernhard

I would it something like this: Start from an existing scheme that looks like the one you are looking for, copy them in your own folder, adjust to your wishes, compile into a library, and call that using controlDict from your simulation.

where should i call in controlDict file..

vatavuk · June 21, 2011, 06:01

Hi Anton,
Thanks for the help.
Paulo

venkataramana · June 21, 2011, 06:25

can u write a procedure, to edit any scheme with steps in openFoam. i need to edit Gauss linear scheme.

thank u,

vatavuk · June 22, 2011, 15:11

Hi Venkataramana,
I'm still trying to figure out how to do it. I suspect that creating a new scheme is more or less like creating a new boundary condition or a new turbulence model, because they all are runtime selectable. I found a programming tutorial that may help:
http://cfd.iut.ac.ir/files/Tutorial,...20Diego%20.pdf
Best wishes,
Paulo

vatavuk · June 22, 2011, 15:12

Sorry I dupplicated the above post and I don't know how to remove it.

nsreddysrsit · November 10, 2011, 03:16

Dear all openfoam users,

where exactly the code for the following upwind scheme is available in openfoam,

$\displaystyle\boxed{\frac{{u_j^{n + 1} - u_j^n}}{{\Delta t}} + c\frac{{u_j^n - u_{j-1}^n}}{{\Delta x}} = 0}$ .
if i want to edit the linear upwind scheme in to 2 nd order and 3rd order and how to implement it ( I mean procedure)
anybody implemented any schemes in open Foam.
Thanks in advance.

Anne Lincke · January 9, 2014, 04:40

Dear foamers,

it has been a while since this post has been made. But I am still facing the same question. Where exactly can be found the implementation of the upwind scheme, or higher order convection schemes (deferred correction, k-scheme) in OpenFOAM?

See also this thread that I opened.

http://www.cfd-online.com/Forums/ope...on-scheme.html

Thank you very much for your answers!
Anne

pablitobass · February 21, 2015, 20:34

Quote:

Originally Posted by Anne Lincke

Dear foamers,

it has been a while since this post has been made. But I am still facing the same question. Where exactly can be found the implementation of the upwind scheme, or higher order convection schemes (deferred correction, k-scheme) in OpenFOAM?

Anne

Hi Anne,

I am facing the same problem. Basically I would like to modify an existing scheme but I could not find where the scheme is defined. By following this path:

src/finiteVolume/interpolation/surfaceInterpolation/limitedSchemes

I found the "interpolation_scheme".H files, but I am afraid that they are related to the limiter of that "interpolation_scheme".

Did you sort out the problem, by any chance?

Cheers!
Paolo

Tushar@cfd · February 21, 2015, 23:40

Quote:

Originally Posted by pablitobass

Hi Anne,

I am facing the same problem. Basically I would like to modify an existing scheme but I could not find where the scheme is defined. By following this path:

src/finiteVolume/interpolation/surfaceInterpolation/limitedSchemes

I found the "interpolation_scheme".H files, but I am afraid that they are related to the limiter of that "interpolation_scheme".

Did you sort out the problem, by any chance?

Cheers!
Paolo

Dear Paolo,

I don't know it will be of any use to you but I think you should refer the following cfd-online post:

http://www.cfd-online.com/Forums/ope...tml#post348575

-
Best Luck!

Andrew_Sm · February 22, 2015, 00:18

Greetings to all!

@Tushar & Paolo
It is because of NDA (https://en.wikipedia.org/wiki/Non-disclosure_agreement). Detailed information of OpenFOAM comes under NDA

Check this out
http://www.cfd-online.com/Forums/ope...tml#post531559

pablitobass · February 22, 2015, 07:23

@Tushar
Thank you very much for your reply. I have already had a look on th e post you suggested me but I couldn't find a solution to my problem.

@Andrew
Thanks to you too. I have also seen the post you suggested about the NDA and I think I am in a different situation. In that post they were talking about a particular case posted by the thread starter. If the case is under NDA, you cannot share information about your results whit other people. In my case I have just asked Anne if she had sorted out her problem and asked where I could find the OpenFOAM file I would like to modify.

Cheers to you All!
Paolo

June 15, 2011, 00:22	implementation of schemes in openfoam	#1
venkataramana Member venkat Join Date: Mar 2011 Location: Bangalore,india Posts: 47 Rep Power: 15	dear all, i have one question, what is the procedure to make customised schemes in openFoam i mean other than existing schemes in openfoam. i need to implement the schemes like upwind. thanks in advance with regards venkataramana

June 16, 2011, 09:18		#8
vatavuk Senior Member Paulo Vatavuk Join Date: Mar 2009 Location: Campinas, Brasil Posts: 196 Rep Power: 17	Hi Anton, Thanks for the hint. I’ve been navigating the code documentation for almost one hour, but I can’t find the point were the vanLeerLimiter class is instantiated. I want to understand were the LimitedScheme parameter is defined. I’ve been studying C++ for some time but I’m still thinking in the FORTRAN way. Can you help me? Thanks, Paulo Last edited by vatavuk; June 16, 2011 at 11:18. Reason: Correct small errors

June 21, 2011, 06:25	hi vatavuk,	#12
venkataramana Member venkat Join Date: Mar 2011 Location: Bangalore,india Posts: 47 Rep Power: 15	can u write a procedure, to edit any scheme with steps in openFoam. i need to edit Gauss linear scheme. thank u,

June 22, 2011, 15:12		#14
vatavuk Senior Member Paulo Vatavuk Join Date: Mar 2009 Location: Campinas, Brasil Posts: 196 Rep Power: 17	Sorry I dupplicated the above post and I don't know how to remove it. Last edited by vatavuk; June 22, 2011 at 15:35.

November 10, 2011, 03:16	schemes	#15
nsreddysrsit Member nsreddy Join Date: Sep 2010 Posts: 40 Rep Power: 15	Dear all openfoam users, where exactly the code for the following upwind scheme is available in openfoam, $\displaystyle\boxed{\frac{{u_j^{n + 1} - u_j^n}}{{\Delta t}} + c\frac{{u_j^n - u_{j-1}^n}}{{\Delta x}} = 0}$ . if i want to edit the linear upwind scheme in to 2 nd order and 3rd order and how to implement it ( I mean procedure) anybody implemented any schemes in open Foam. Thanks in advance.

June 15, 2011, 02:16		#2
Bernhard Senior Member Bernhard Join Date: Sep 2009 Location: Delft Posts: 790 Rep Power: 21	Upwind schemes are implemented a long, long time ago, see here how to use them: http://www.openfoam.com/docs/user/fvSchemes.php

June 15, 2011, 02:33		#3
venkataramana Member venkat Join Date: Mar 2011 Location: Bangalore,india Posts: 47 Rep Power: 15	what i mean to say the schemes other than upwind, linear which are available in openFoam, How to develop a new scheme and how to run it. thanks for your reply,

June 15, 2011, 03:21		#4
Bernhard Senior Member Bernhard Join Date: Sep 2009 Location: Delft Posts: 790 Rep Power: 21	I would it something like this: Start from an existing scheme that looks like the one you are looking for, copy them in your own folder, adjust to your wishes, compile into a library, and call that using controlDict from your simulation.

June 15, 2011, 05:38		#5
venkataramana Member venkat Join Date: Mar 2011 Location: Bangalore,india Posts: 47 Rep Power: 15	thank u very much, i will try it

June 15, 2011, 09:20		#6
vatavuk Senior Member Paulo Vatavuk Join Date: Mar 2009 Location: Campinas, Brasil Posts: 196 Rep Power: 17	Hi Bernard, I have a doubt similar to Venkataramana's. Which file I have to edit to modify the van Leer scheme? Thanks, Paulo Vatavuk

June 15, 2011, 09:37		#7
akidess Senior Member Anton Kidess Join Date: May 2009 Location: Germany Posts: 1,377 Rep Power: 29	See vanLeer.H

June 21, 2011, 02:37		#9
akidess Senior Member Anton Kidess Join Date: May 2009 Location: Germany Posts: 1,377 Rep Power: 29	It's a bit tough to find where it is instantiated because the trail breaks due to the use of macros. If you just want to implement a different limiter, just stick to vanLeer.H (updated link) and edit the limiter function there.

June 21, 2011, 06:01		#11
vatavuk Senior Member Paulo Vatavuk Join Date: Mar 2009 Location: Campinas, Brasil Posts: 196 Rep Power: 17	Hi Anton, Thanks for the help. Paulo

June 22, 2011, 15:11		#13
vatavuk Senior Member Paulo Vatavuk Join Date: Mar 2009 Location: Campinas, Brasil Posts: 196 Rep Power: 17	Hi Venkataramana, I'm still trying to figure out how to do it. I suspect that creating a new scheme is more or less like creating a new boundary condition or a new turbulence model, because they all are runtime selectable. I found a programming tutorial that may help: http://cfd.iut.ac.ir/files/Tutorial,...20Diego%20.pdf Best wishes, Paulo

January 9, 2014, 04:40		#16
Anne Lincke Senior Member Anne Gerdes Join Date: Aug 2010 Location: Hamburg Posts: 168 Rep Power: 15	Dear foamers, it has been a while since this post has been made. But I am still facing the same question. Where exactly can be found the implementation of the upwind scheme, or higher order convection schemes (deferred correction, k-scheme) in OpenFOAM? See also this thread that I opened. http://www.cfd-online.com/Forums/ope...on-scheme.html Thank you very much for your answers! Anne

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February 22, 2015, 00:18		#19
Andrew_Sm New Member Andrew Smith Join Date: Jan 2015 Location: North Dakota Posts: 24 Rep Power: 11	Greetings to all! @Tushar & Paolo It is because of NDA (https://en.wikipedia.org/wiki/Non-disclosure_agreement). Detailed information of OpenFOAM comes under NDA Check this out http://www.cfd-online.com/Forums/ope...tml#post531559

February 22, 2015, 07:23		#20
pablitobass Member Paolo Capobianchi Join Date: Sep 2014 Posts: 35 Rep Power: 11	@Tushar Thank you very much for your reply. I have already had a look on th e post you suggested me but I couldn't find a solution to my problem. @Andrew Thanks to you too. I have also seen the post you suggested about the NDA and I think I am in a different situation. In that post they were talking about a particular case posted by the thread starter. If the case is under NDA, you cannot share information about your results whit other people. In my case I have just asked Anne if she had sorted out her problem and asked where I could find the OpenFOAM file I would like to modify. Cheers to you All! Paolo