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localEuler rDeltaT

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Old   November 4, 2013, 11:27
Default localEuler rDeltaT
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Onno
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Hi,

I would like to use pimpleFoam in conjunction with "localEuler rDeltaT" as ddtScheme.

But when I start the simulation OF produces the following error message:

"request for volScalarField rDeltaT from objectRegistry region0 failed"

I've checked the tutorials that use this ddtScheme but none of them had a 0/rDeltaT nor did their Allrun-Scripts mention the creation of such a file. I assume the solver itself initializes the file. Why doesn't pimpleFoam do so?

Hope someone can help

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Old   November 5, 2013, 04:05
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When I search github, the solvers with a LTS in their name create the volScalarField rDeltaT themselves. Which probably means that pimpleFoam can't use localEuler.
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Old   May 19, 2017, 07:06
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Kisorthman Vimalakanthan
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Quote:
Originally Posted by Kaskade View Post
When I search github, the solvers with a LTS in their name create the volScalarField rDeltaT themselves. Which probably means that pimpleFoam can't use localEuler.
Hi Kaskade,

I'm also getting the same error, with OF 4.1:
request for volScalarField rDeltaT from objectRegistry

Did you ever find a solution to localEuler for incompressible problems?

Any help is greatly appreciated,
Kind regards,
Kishore
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Old   May 19, 2017, 07:18
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http://www.openfoam.com/documentatio...cal-euler.html

As described in this documentation page, its available only for specific solvers. The solver itself creates a volScalarField rDeltaT object just like any other field for its later usage. If you are "not" using such solver then you will have to modify the solver you are using to include this.

More Info here:
localEuler in rhoCentralFoam

Last edited by khedar; May 19, 2017 at 07:19. Reason: added "not"
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Old   May 19, 2017, 08:44
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Quote:
Originally Posted by khedar View Post
http://www.openfoam.com/documentatio...cal-euler.html

As described in this documentation page, its available only for specific solvers. The solver itself creates a volScalarField rDeltaT object just like any other field for its later usage. If you are "not" using such solver then you will have to modify the solver you are using to include this.

More Info here:
localEuler in rhoCentralFoam
Thank you very much

Have you had any success with incorporating it to the pimpleFoam? I'm really new to OpenFOAM, do you think its if I follow the post you shared about localEuler in rhoCentralFoam I would be able to get it done? i.e. is there anything particular that I may have to account for when implementing it to the pimpleFoam?

Thanks again for the swift reply,
Kind regards,
Kishore
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Old   May 19, 2017, 09:51
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I have not implemented it, but it should be doable. Why don't you try and find out?
Do share if you implement it.

Regards,
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Old   May 19, 2017, 12:53
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To be honest I can't even remember posting this thread. (Then again, it IS old.)
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Old   May 19, 2017, 17:37
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I'm glad you posted it! Not sure how much benefit it would make on convergence. But if I do implement it I will surely share it here
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Old   May 19, 2017, 19:34
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I implemented it for pimpleFoam and buoyantPimpleFoam today but have not done exhaustive testing. You will find the source code and test case for pimpleFoam on my bitbucket repository.

https://bitbucket.org/khedar/pimplefoamlocaleuler/src

Try it out

P.S. You have to run using pimpleFoamUser or buoyantPimpleFoamUser
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Old   May 20, 2017, 02:51
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Oh wow! Thank you very much _/|\_ Will do a comparison against simpleFoam with the default relaxation factors and post the results here.

Any particular test case you might have in mind? Guess one of the simpleFoam tutorial case would be good right?

Kind regards,
Kishore
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