Hi Alex,

We have merged that functionality into Nektar about a month ago and is available if you build the current master

User-guide (sec 3.6.3 page 72) has some instruction on how to use it and you can also look at the following test “ChanFlow3D_infTurb.xml” located in “nektar++/solvers/IncNavierStokesSolver/Tests”

Just note that since this is a test, we have restricted the number of eddies. You will need to remove/comment out the <TestCase> tag in the Forcing tag (I highlighted it below) for the real application.

<FORCING>

        <FORCE TYPE="IncNSSyntheticTurbulence">

            <ReynoldsStresses> ReyStresses                                 </ReynoldsStresses>

            <CharLengthScales> LenScales                                   </CharLengthScales>

            <BoxOfEddies> 1.0 0.0 1.5707963267948966 2.0 3.141592653589793 </BoxOfEddies>

            <Sigma> 0.7                                                    </Sigma>

            <BulkVelocity> 1.0                                             </BulkVelocity>

<TestCase> ChanFlow3D                                          </TestCase>

        </FORCE>

    </FORCING>

Cheers,

Mohsen

From: nektar-users-bounces@imperial.ac.uk <nektar-users-bounces@imperial.ac.uk> on behalf of Sherwin, Spencer J <s.sherwin@imperial.ac.uk>
Date: Wednesday, 9 October 2024 at 12:31
To: Alexander Schukmann <alexander.schukmann@protonmail.com>, nektar-users <nektar-users@imperial.ac.uk>, Isler, Joao A <j.isler20@imperial.ac.uk>
Subject: Re: [Nektar-users] Synthetic Eddy Method

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HI Alex,

I think the technology has now been merged. I am cc’ing Joao to provide you with some details but I think there should also be something in the uer guide.

Best,

Spencer.

From: nektar-users-bounces@imperial.ac.uk <nektar-users-bounces@imperial.ac.uk> on behalf of Alexander Schukmann <alexander.schukmann@protonmail.com>
Date: Wednesday, 9 October 2024 at 12:27
To: nektar-users <nektar-users@imperial.ac.uk>
Subject: [Nektar-users] Synthetic Eddy Method

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Hello everyone,

I remember that João had presented a Synthetic Eddy Generator at the last workshop and wanted to ask if it will appear with the next release. I would also like to know which methods are used and recommended by experienced Nektar users to generate inlet turbulence. Perhaps someone can say a few words about this. Many thanks in advance!

All the best

Alex