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Incompressible LES tutorial (oodles) - time averaged statistics

Posted February 23, 2017 at 03:18 by kindle

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Quote:

Originally Posted by bernarde

Good day

I have completed the Incompressible LES tutorial (oodles pitzDaily). Viewing the results in paraFoam gives me the field values at discrete time steps throughout the simulation.

However, I would like to view the average over say the last 100 steps, to view the statistics of the solution. Is there a way I can do this in paraFoam?

Also, how is convergence judged in this example? Normally I judge conversion in a

...

kindle

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Posted in Post-processing

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Pressure units in incompressible solvers

Posted February 23, 2017 at 03:17 by kindle

Quote:

Originally Posted by Per

Hi

I am quite new to OpenFOAM, and have some basic questions about units. From the tutorial cases I see that the units for pressure in incompressible solvers (e.g. simpleFoam) are m^2/s^2. Which make sense since pressure is constant. I guess I then have to scale (divide) my pressure initial and boundary conditions with rho in order to get a correct solution? My real question is: can I define my pressure units to be kg/ms^2 and define density rho in the transportProperties file

...

kindle

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Posted in Uncategorized

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non-uniform boundray condition - solution parabolicVelocityFvPatchV ectorField

Posted February 23, 2017 at 03:16 by kindle
Updated June 7, 2017 at 12:19 by kindle

From

http://www.tfd.chalmers.se/~hani/kur...yCondition.pdf

https://sourceforge.net/p/openfoam-e...bolicVelocity/

Compile the shared object (library) and add

Quote:

libs ("libmyBCs.so");

to system/controlDict

it will be linked ONLY at run time by LD_LIBRARY_PATH. It is linked using...

kindle

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Posted in programming

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corrupted double-linked list

Posted February 21, 2017 at 12:04 by kindle

I copied a derived boundary condition from src/finiteVolume/fields/fvPatchFields/derived/turbulentInlet modified and recompiled it in user directory. It compiles and I name the new library libturbulentInletUser.
When using it in a simluation. Running the solver seems all right but I get "corrupted double-linked list" when I call "blockMesh" or "decomposePar".

In the source code, all classes in finiteVolume is compiled as a single library which contains...

kindle

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Posted in Good habit, runtime

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LES: Turbulent Channel Flow without initial solution (BC)

Posted February 21, 2017 at 09:33 by kindle
Updated February 23, 2017 at 03:02 by kindle

In this post, the kinetic energy is monitered and the turbulentInlet condition is explained. We cannot use Reynolds averaged profile as inlet, because it is only seen by time average.

While monitering kinetic energy of all flow (not just the turbulent part), when this value tends to some stable state the mean and the turbulent part is then established.

Quote:

Originally Posted by Lieven

Hi Danesh,

Averaged profiles are not instantaneous profiles. You will never see them in real life as in 'hey

...

kindle

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Posted in Pre-processing

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