[Thangam]

what is the sequence of the Reynolds stress components that are written after a fieldAverage i.e UPrime2Mean. UPrime2Mean writes out 6 components but what is the sequence that OpenFoam writes? Is it R11, R22, R33, R12, R13 and R23 or is it R11, R12, R13, R22, R23 and R33? I cant figure out from the src code of fieldAverage!

Thanks.

[Thangam]

Any starting points to look at??

Thanks.

[rajibroy]

its R11, R12, R13, R22, R23 and R33

look at the value of any solution; R_ii should be always positive

[Thangam]

Hi Thanks for the clarification. But to avoid confusion on the order of, following did the job for me! This will write out all the components in their respective folders!

foamCalc components UPrime2Mean -latestTime

[babakflame]

Greetings Thangam

Thanks for the code. Actually, by using this code, the confusion on Reynolds stress components sequence is removed.

Best,
Bobi

[Gang Wang]

Originally Posted by Thangam

what is the sequence of the Reynolds stress components that are written after a fieldAverage i.e UPrime2Mean. UPrime2Mean writes out 6 components but what is the sequence that OpenFoam writes? Is it R11, R22, R33, R12, R13 and R23 or is it R11, R12, R13, R22, R23 and R33? I cant figure out from the src code of fieldAverage!

Thanks.

Hi!

I know it's a very old thread and post but recently I'm also engaged in this topics. I'd like to know UPrime2Mean is exactly the Reynolds Stress tensor, right?

Best,
Gang

[ari003]

Originally Posted by Gang Wang

Hi!

I know it's a very old thread and post but recently I'm also engaged in this topics. I'd like to know UPrime2Mean is exactly the Reynolds Stress tensor, right?

Best,
Gang

yes it is so

[lukasf]

I can confirm the following sequence of UPrime2Mean.


OpenFOAM (v1912):

1. Rxx
2. Rxy
3. Rxz
4. Ryy
4. Ryz
6. Rzz


ParaView:

1. Rxx
2. Ryy
3. Rzz
4. Rxy
4. Ryz
6. Rxz


I checked it doing the following:

Write the UPrime2Mean field by using a fieldAverage function in the controlDict.I opened the solution with Paraview and choose the calculator filter. Next selected attribute type: cell data.
Result array name e.g. result
Select scalars e.g. UPrime2Mean_XX _YY and so on.

Open a spread sheet view and compare the value with your OpenFoam solution file.

[Tobermory]

I can confirm the following sequence of UPrime2Mean.


OpenFOAM (v1912):

1. Rxx
2. Rxy
3. Rxz
4. Ryy
4. Ryz
6. Rzz

I like your empirical approach. You could of course just look in the code - UPrime2Mean is a symmetric tensor, and the components are enumerated on line 77 of SymmTensor.H:

      //- Component labeling enumeration
     enum components { XX, XY, XZ, YY, YZ, ZZ };

The equivalent for a non-symmetric tensor can be found on line 88 of Tensor.H:

     //- Component labeling enumeration
     enum components { XX, XY, XZ, YX, YY, YZ, ZX, ZY, ZZ };