[Speng]

Hello, I'm just getting started with SU2 and I'm running the inviscid bump case and I was wondering how to calculate the mass flow thru an inlet or outlet surface? Can SU2 be made to do integral calculations on a given marker surface or would this be something I have to do in a postprocessing step? I figure this would be useful for internal flows.

[bigfootedrockmidget]

Hi,

You can add markers to MARKER_ANALYZE:

MARKER_ANALYZE= ( inlet, outlet )

and output the mass flow rate to the screen output:

SCREEN_OUTPUT= (INNER_ITER, SURFACE_MASSFLOW)

You will then get the total mass flow rate and the individual mass flow rates.
The keyword is part of the keyword group FLOW_COEFF_SURF, and you can output this group in the history file using:

HISTORY_OUTPUT= (FLOW_COEFF_SURF)

The keywords you can use for the screen output, and the values stores in the history file are:

SURFACE_MASSFLOW
SURFACE_MACH
SURFACE_STATIC_TEMPERATURE
SURFACE_STATIC_PRESSURE
AVG_DENSITY
AVG_ENTHALPY
AVG_NORMALVEL
SURFACE_UNIFORMITY
SURFACE_SECONDARY
SURFACE_MOM_DISTORTION
SURFACE_SECOND_OVER_UNIFORM
SURFACE_TOTAL_TEMPERATURE
SURFACE_TOTAL_PRESSURE

[Speng]

Thanks.
how did you figure out this? Do I need to read the code or are there documentation features somewhere?

[bigfootedrockmidget]

Hi,

In this case, I checked the existing testcases, the piece of code in SU2_CFD/src/output/CFlowOutput.cpp and I asked an SU2 sage.
A user should expect this information in the su2code docs, specifically here :

https://su2code.github.io/docs_v7/Custom-Output/


This specific detail is not there, so we should add it.

[Speng]

I started digging around in the User Guide in the Docs area. Also useful to run SU2_CFD -d <config file> which shows I/O options among other things.