[an.so]

Hey all

I have run the tutorial case "surface mounted cube". Since this worked I now wanted to increase the delta value for the turbulent boundary condition turbulentDFSEMInlet in the U file.
My Problem: when i change the delta value, the velocity field does not change. Has somebody already had the same problem or can you help me? (I'm not that experienced with OpenFOAM )
I'm thankful for every answers!

[HPE]

does not change the instantaneous or time-averaged velocity field?
which velocity field?
which output parameter should be expected to be changed by changing delta?

[an.so]

Thanks for your answer!
I implemented sample file which extracts for each time step the transient velocity at certain points in the velocity field. These values don't change.
And it would be the target/hope that you can influence the transient velocity with the delta value.
Or is there another or better way to influence the transient velocity with the turbulent DFSEM inlet?

[HPE]

>> Or is there another or better way to influence the transient velocity with the turbulent DFSEM inlet?

What do you mean by the `influence`?

Could you please restate your question, if possible?

[an.so]

Finally I want to examine the turbulence properties, like the turbulent kinetic energy, therefor I need the velocity. I would like to know how much these properties change, if I change the turbulent inlet parameters, like the delta value.

[HPE]

I think `delta` is something like a characteristic length scale of the domain/flow. For example, for smooth-wall plane channel flow, it would be the half wall-normal height. I would refer to the original paper, or the implementation: here to understand what each variable means.

The most important determinants of the output of this BC are, I would say: R, L, and U, which respectively are Reynolds stress symmetric tensor, integral length scale(s) and time-averaged reference velocity.

[an.so]

Thanks you a lot for your help. Not it is working

[kooki_13]

Originally Posted by HPE

I think `delta` is something like a characteristic length scale of the domain/flow. For example, for smooth-wall plane channel flow, it would be the half wall-normal height. I would refer to the original paper, or the implementation: here to understand what each variable means.

The most important determinants of the output of this BC are, I would say: R, L, and U, which respectively are Reynolds stress symmetric tensor, integral length scale(s) and time-averaged reference velocity.

Hi HPE
I want to simulate turbulent jet flow. Would you kindly tell me what is characteristic and integral length scale then?