[Brokenrealm]

Hey y'all!

I am working on an 3D unsteady turbulent backward facing step case and I am having some issues with the volume fields that are available to be output. The case I am testing is incompressible, however, some of the data I am trying to gather seems to not be available from the unsteady incompressible solver. When I try to run my case with "-d" to see what volume fields I can output, I do not see any time-averaged fields. Doing the same with a compressible case lets me output the time-averaged fields which include the Reynolds-stress terms.

I am trying to plot the time-averaged velocity, turbulent kinetic energy, and some Reynolds-stress terms at different point downstream of the step. Am I doing something wrong in the setup of my incompressible simulation? Is there simply no support for the time-averaged output fields in the incompressible solver? Or something else?

I greatly appreciate any help provided!

[Amber0922]

Hi， have you solved this problem?
I tried a similar case before, it's ma=0.128, as incompressible. But it seems SU2 cannot output the time average information under incommpressible flow, so I set it as compressible. But unfortunately, it's result doesn't goes well, I don't know if it's the result of compressible.
So, if you carry out a result, maybe we can share experience with each other.

[bigfootedrockmidget]

compressible and incompressible volume output both call the same time-averaged output function LoadTimeAveragedData, so it *should* be the same. Or maybe you are doing something different from what I think you are doing, so could you share your compressible and incompressible config and point out what is not working and how you expect it to work?


If I run SU2_CFD -d on a compressible and an incompressible unsteady case (unsteady square case from testcases repository ), I see the following volume outputs below, did this not work for you?:

|MEAN_DENSITY        |TIME_AVERAGE         |Mean density
|MEAN_VELOCITY-X     |TIME_AVERAGE         |Mean velocity x-component
|MEAN_VELOCITY-Y     |TIME_AVERAGE         |Mean velocity y-component
|MEAN_PRESSURE       |TIME_AVERAGE         |Mean pressure
|RMS_U               |TIME_AVERAGE         |RMS u
|RMS_V               |TIME_AVERAGE         |RMS v
|RMS_UV              |TIME_AVERAGE         |RMS uv
|RMS_P               |TIME_AVERAGE         |RMS Pressure
|UUPRIME             |TIME_AVERAGE         |Mean Reynolds-stress component u'u'
|VVPRIME             |TIME_AVERAGE         |Mean Reynolds-stress component v'v'
|UVPRIME             |TIME_AVERAGE         |Mean Reynolds-stress component u'v'
|PPRIME              |TIME_AVERAGE         |Mean pressure fluctuation p'p'

[Brokenrealm]

I have attached the compressible and incompressible configuration files below (as .txt in order to upload). I am using SU2 version 7.5.1 to run the square cylinder test case that you suggested, however, the version I am using to run my case is 7.3.1. It would be very difficult to upgrade the version on the system I am using, so I am trying to avoid that if possible.

In any case, I do not get the TIME_AVERAGE group for the incompressible case using the config file I attached. The compressible case does show the TIME_AVERAGE group though, so I am not sure what I am doing wrong or if there is an issue somewhere.

[bigfootedrockmidget]

OK, TIME_AVERAGE for incompressible was added last month, so you'll have to use the current development version for that. It will be in the next main release (v8).

[Brokenrealm]

Okay, that's good to know. I went ahead and added the changes to the older version I have and recompiled the executables manually. I am happy to report that it It has been working and I am looking forward to the new release! I appreciate your help pointing out that specific function, as I could not have figured it out without that.

[bigfootedrockmidget]

That's great to hear!


By the way, why are you running the older version? If you have difficulty with installation/upgrading please let us know as well.