Y plus for a fuel rod bundle.

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meb15aa
Posts: 15
Joined: Wed Feb 27, 2019 2:32 pm

Y plus for a fuel rod bundle.

Post by meb15aa » Thu Apr 04, 2019 1:09 pm

Hi again everyone,
I would just like some clarification on something. I am working on a fuel bundle, and I am unsure if I calculated my y plus value correctly. I used an online Y plus calculator that my peers advised me to use.
http://www.pointwise.com/yplus/

https://www.nuclear-power.net/nuclear-e ... iameter-2/

In regards to the reference length, when looking through code saturne documents it talked about the hydraulic diameter.

https://www.code-saturne.org/cms/sites/ ... e-Wall.pdf

https://www.nuclear-power.net/nuclear-e ... iameter-2/

I used this value as the reference length for calculating my y plus. Is this correct?

Antech
Posts: 119
Joined: Wed Jun 10, 2015 10:02 am

Re: Y plus for a fuel rod bundle.

Post by Antech » Thu Apr 04, 2019 4:46 pm

Hello.
This reference length is an approximate boundary layer length (I believe, in streamwise direction). It' doesn't affect required first cell height much so it's not critical. Just check the Y+ after the calculation and ensure that it doesn't exceed 2...3 in the area of interest and that it's not too low (like 0.1 or lower).

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