[Nek5000-users] Fwd: Variable density flows

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

In principle, this should work with the Pn-Pn-2 STRESS formulation, but
I don't think it has been thoroughly tested.

Regarding large viscosity variations, work needs to be done on the 
preconditioners for the viscous terms.   This hasn't been a traditional
focus for Nek5000, which has been aimed at high Reynolds number flows
where the viscous solves are essentially trivial (compared to the
pressure, say).

Certainly, there are things that could be done to be effective in
this space.  I would start by running some test problems with the
STRESS formulation to see if you get the accuracy you're after.  If
so, then we can look into performance enhancement via better preconditioning
strategies for the case at hand.

HTH,

Paul

----- Original Message -----
From: nek5000-users at lists.mcs.anl.gov
To: "nek5000" <nek5000-users at lists.mcs.anl.gov>
Sent: Friday, October 11, 2013 9:16:24 AM
Subject: [Nek5000-users] Fwd: Variable density flows



Hello 





Can we solve variable density incompressible flows with nek5000 ? For e.g. see the model given by eq. 2.1 here 


http://www.math.tamu.edu/~guermond/PUBLICATIONS/guermond_quartapelle_JCP_2000.pdf 



Also, can nek handle variable viscosity with large variations ? 


Thanks 
praveen 

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