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-   -   practical way to have datas of point, U, R, L for turbulentDFSEMInlet? (https://www.cfd-online.com/Forums/openfoam-solving/224663-practical-way-have-datas-point-u-r-l-turbulentdfseminlet.html)

spalartallmaras February 28, 2020 05:35
practical way to have datas of point, U, R, L for turbulentDFSEMInlet?
 
Hello,

I would like to use the boundary condition turbulentDFSEMInlet (simulation is pimpleFoam),

but I dont know how the tutorial turbulent channel flow

(https://www.openfoam.com/documentati...nnel-flow.html)

generated the files point, U, R, L.

Has anyone idea for that?

mAlletto March 1, 2020 16:26
Sample the fields at a plane and convert the results to a format desired with a bash or python script. L can be calculated from k and epsilon or k and omega.

spalartallmaras March 3, 2020 07:39
Quote:
Originally Posted by mAlletto (Post 760057)
Sample the fields at a plane and convert the results to a format desired with a bash or python script. L can be calculated from k and epsilon or k and omega.

Thank you for your answer. Do you mean the plane the inlet?

spalartallmaras March 3, 2020 08:32
new error message
 
After k-epsilon simulation with simpleFoam I got points, U, R, L at inlet.

But if I want to do decomposePar, there is a problem in R-file.

Code:
Reynolds stress (3.36378 0.0834591 -2.99156 4.1052 -1.26132 6.56265) at face 0
leads to an invalid Cholesky decomposition due to the constraint
R_zz - sqr(a_xz) - sqr(a_yz) >= 0
Has anyone experience about this error?

Jason_Duguay April 17, 2020 13:53
Hello,


I ran into the same error. Just wondering if you made any progress?

mAlletto April 17, 2020 14:22
I think the data should be sampled at the outlet where the flow is fully developed

binayak March 30, 2021 06:24
Quote:
Originally Posted by spalartallmaras (Post 760274)
After k-epsilon simulation with simpleFoam I got points, U, R, L at inlet.

But if I want to do decomposePar, there is a problem in R-file.

Code:
Reynolds stress (3.36378 0.0834591 -2.99156 4.1052 -1.26132 6.56265) at face 0
leads to an invalid Cholesky decomposition due to the constraint
R_zz - sqr(a_xz) - sqr(a_yz) >= 0
Has anyone experience about this error?
I have got the same error. what is the possible solution?


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