[Hawxliquid]

Hello !
I have two, probably basics, questions.

My first one is about wall functions. I am wondering if wall functions models all the sublayers of a boundary layer, or only a sublayer? (Viscous,Buffer and log law).

My second one is a bit more specific, it probably applies to all CFD programs, but I am used to Fluent.
It concerns initialization. It seems that hybrid initialization solves Laplace's equations for p and V, but how does a so called 'standard' initialization works ? Constant values ? Static case ?

Thank you !

[aerosjc]

1. I guess you are asking about wall function in Fluent. It models viscous sublayer and log-law region. See [Fluent Theory Guide](http://www.afs.enea.it/project/neptu.../th/node99.htm).
2. Standard initialization just use what you specify in the panel to initialize the flow field. Const value.

[sbaffini]

Originally Posted by Hawxliquid

I am wondering if wall functions models all the sublayers of a boundary layer, or only a sublayer? (Viscous,Buffer and log law).

Well, it actually depends on the specific wall function model.

Fluent has all kinds of models ranging from "only log" to "log + viscous" to "log + viscous + buffer".

As another example, check this:

https://www.cfd-online.com/Forums/bl...on-part-1.html

and the following parts (2-3).

[Hawxliquid]

Thanks to you two !