[Nek5000-users] Variable Viscosity in .usr file

[nek5000-users at lists.mcs.anl.gov]

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

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