|
[Sponsors] |
March 23, 2008, 04:57 |
Upwind Schemes in Non-Newtonian Flows
|
#1 |
Guest
Posts: n/a
|
Hi Dear Friends,
My question is this one: Why it is need to apply high resolution upwind scheme in Non-Newtonian and Viscoelastic flows? I think these problems are not dominated by advection!!! Ferreira |
|
March 24, 2008, 08:54 |
Re: Upwind Schemes in Non-Newtonian Flows
|
#2 |
Guest
Posts: n/a
|
Possible reasons
1. Non-Newtonian simply means that the constitutive relationship between stress and velocity is not the linear model that we use in the NS equations for closure. That has no bearing on whether the flow is advection-dominated, i.e. non-Newtonian flows can be just as advection-dominated as Newtonian flows. 2. If a flow is highly visco-elastic, then it may not be advection dominated. But if I am a researcher who has a working upwind code, and I need to generate a code which will work for a visco-elastic flow, then which makes more sense - create an entirely new code, or swap out the module that I use to compute stress as a function of velocity? If I choose the latter, I have a code that requires less validation, and it will remain valid even for those visco-elastic flows that will have areas of non-negligible advection (which may be more often than you think). |
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
When to use upwind or central differencing schemes? | quarkz | Main CFD Forum | 6 | August 19, 2011 04:24 |
Numerical schemes for free surface flows (VOF) | botp | OpenFOAM | 2 | March 11, 2011 16:27 |
First Order Upwind X High-Order Upwind (CUBISTA) Schemes | buscapeh | Main CFD Forum | 0 | September 23, 2010 23:32 |
upwind schemes | shuo | Main CFD Forum | 2 | September 27, 2007 07:50 |
LES+initial perturbation | RajaniKumar | Main CFD Forum | 13 | December 17, 2001 15:25 |