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xPlus utility

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Old   August 18, 2015, 06:36
Default xPlus utility
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Syavash
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Dear Foamers,

Is there any utility developed for calculating xPlus and zPlus in a LES simulation?!

Thanks,
Syavash
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Old   August 18, 2015, 10:48
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Quick question: Can you please provide more details on what are you talking about?
In other words: What are "x+" and "z+"?
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Old   August 18, 2015, 14:01
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Quote:
Originally Posted by wyldckat View Post
Quick question: Can you please provide more details on what are you talking about?
In other words: What are "x+" and "z+"?

Hi Bruno,

You make me ashamed of myself!!
By x+ I meant a cell streamwise grid spacing, non-dimensionalized by friction velocity and dynamic viscosity. Maybe I should have named it deltax+.
It is just like deltay+ except in spatial direction.
I need to evalute my grid spacings to compare with literature in terms of x+ and z+ distribution on the wall.

Syavash

-----

A good starting point may be yPlusLES utility, but I cannot manage to find how to consider streamwise grid spacing instead of wall normal spacing.

Last edited by wyldckat; August 18, 2015 at 14:20. Reason: merged posts that were a few minutes apart
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Old   August 18, 2015, 14:28
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Quick answer: Mmm... sorry, I was expecting something more related to LES modelling, perhaps something related to the filters or something like that... hence my question.

The problem is that the "x" and "z" measurements can't be easily done generically:
  • The "y" value is the distance of the centre of the face on the wall to the centre of the cell, which are both well defined.
  • The remaining dimensions would possibly have to rely on the bounding box of the cell, i.e. to create the minimum and maximum measurements for all vertices of each cell, but in the coordinates of the flow.
This to say that its probably why there is not yet such a utility that calculates this for OpenFOAM.

Either way, you can draw some calculation ideas from the solver "applications/solvers/incompressible/boundaryFoam".
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