[Nek5000-users] Variable Viscosity in .usr file

nek5000-users at lists.mcs.anl.gov nek5000-users at lists.mcs.anl.gov
Mon Jan 22 04:00:01 CST 2018


You have to use two scalars (+temperature) if your material properties (jet/air) differ.

On 22 Jan 2018, at 10:57, "nek5000-users at lists.mcs.anl.gov <mailto:nek5000-users at lists.mcs.anl.gov> " <nek5000-users at lists.mcs.anl.gov <mailto:nek5000-users at lists.mcs.anl.gov> > wrote:

The ideal gas law is not hard coded. You can chance the material properties through uservp() and the so called thermal divergence (Drho/Dt) in userqtl() in the usr file.

On 21 Jan 2018, at 19:00, "nek5000-users at lists.mcs.anl.gov <mailto:nek5000-users at lists.mcs.anl.gov> " <nek5000-users at lists.mcs.anl.gov <mailto:nek5000-users at lists.mcs.anl.gov> > wrote:

Hello All,

I'm trying to simulate a low density jet expanding into air using low Mach number formulation. I have followed the steps for enabling the stress formulation from the documentation. Is it enough to specify the variation of viscosity with temperature (sutherland formula) in the .usr (in uservp() section) file? If yes, is there an example in Nek5000 repo? And it says in the Nek Documentation that Idea Gas equation ( P = rho*R*T) has been hard coded. So where do I input the information about R? And how will the solver know that bulk fluid is air and the incoming jet is a fluid with lower density?

I'm really grateful to any help I can get regarding my question. Thanks in advance. 

-- 
Nitish Kovalam
Aerospace Engineering
Indian Institute of Space Science and Technology

_______________________________________________

Nek5000-users mailing list

Nek5000-users at lists.mcs.anl.gov <mailto:Nek5000-users at lists.mcs.anl.gov> 

https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users




_______________________________________________

Nek5000-users mailing list

Nek5000-users at lists.mcs.anl.gov <mailto:Nek5000-users at lists.mcs.anl.gov> 

https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/nek5000-users/attachments/20180122/7c842969/attachment.html>


More information about the Nek5000-users mailing list