[asal]

Hello everybody!

I am confused with Dynamic viscosity and Kinematic viscosity in FLUENT!

as we know:
unit of Dynamic viscosity in SI is kg/m.s
and
unit of Kinematic viscosity in SI is m2/s

in FLUENT under "Reference Values" there is a Viscosity with unit kg/m.s
according to the unit this viscosity should be "Dynamic viscosity", but when I check the Fluent manual, it said:
sets the reference kinematic viscosity, which is used in the computation of the boundary Reynolds number.

Can someone explain this to me?! why "kinematic viscosity" has unit of "Dynamic viscosity" in FLUENT?!!!!!

Thanks.

[shereez234]

Don't worry about the Manual it might have some typing errors.

I am pretty sure in Fluent you adjust the Dynamic viscosity. Hope this is re-ensuring your concern.

[LuckyTran]

In Fluent User's Guide 33.11.1 Setting Reference Values it clearly states dynamic viscosity in my manual.

[shereez234]

Originally Posted by LuckyTran

In Fluent User's Guide 33.11.1 Setting Reference Values it clearly states dynamic viscosity in my manual.

You are right mine says that too I just checked.


Yeah. It seems to me that some old manuals and theory guides had some amount of typing errors. I especially noticed this when I was writing a turbulence model in OpenFoam by looking at Fluent theory guide., there is a post in OpenFoam forum by roriguez indicating some of these typos.

[asal]

Hello and thanks for your comments

If you see the section:
35.11. Reference Values Task Page
it clearly written:
Viscosity sets the reference kinematic viscosity, which is used in the computation of the boundary Reynolds number.



see the attached figure and
See this link also:
http://aerojet.engr.ucdavis.edu/flue...ference_Values

[`e`]

It's most likely a typo in that section of the users guide. In section 32.11.1 they've correctly labelled it as dynamic viscosity.

[LuckyTran]

Originally Posted by asal

see the attached figure and
See this link also:
http://aerojet.engr.ucdavis.edu/flue...ference_Values

This link is to the manual for v6.3 Fluent. No user should have any business referring to a manual that old. Don't expect to find fresh goods in someone else's garbage. It's probably rotten.

[Hgholami]

Hi,
In fluent, for non-Newtonian fluid, the dimension that used for Consistency Index "k" is [kg-s^n-2/m]. How can convert it to kg/m-s or m^2/s?
Why they uses