[Nek5000-users] Calculating very small Lewis numbers in Nekton

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

How do you set the Lewis number in the advection-diffusion equation?

Marco

On Dec 4, 2017, at 3:08 PM, nek5000-users at lists.mcs.anl.gov<mailto:nek5000-users at lists.mcs.anl.gov> wrote:

Hey Marco,

The error message is "Failed in HMHOLTZ" for the scalar and NaN value is being returned.

Thanks,
Saikat

Saikat Mukherjee,
PhD Student,
Paul Research Group - http://www.me.vt.edu/mpaul/
Engineering Science and Mechanics,
Virginia Tech.

On Mon, Dec 4, 2017 at 2:34 PM, <nek5000-users at lists.mcs.anl.gov<mailto:nek5000-users at lists.mcs.anl.gov>> wrote:
Salkat,

could you please be more specific when you write ‘ I have not been successful’? Do you get an error message?

Marco

On Dec 4, 2017, at 2:31 PM, nek5000-users at lists.mcs.anl.gov<mailto:nek5000-users at lists.mcs.anl.gov> wrote:

Hello Neks,

I am solving a Reaction Advection Diffusion equation, where with my non-dimensionalization, the Lewis Number(Le) is the parameter multiplying the Laplacian. That is, Le is the  non-dimensional Diffusion co-efficient of the species. Currently I can do Le = 0.1, but to reduce it further down to 0.01, or 0.001, the spatial resolution has to be increased. I tried doing that increasing the GLL points in SIZE file by increasing the lx1, lxd, but till now I have been unsuccessful.

I am aware there is a special filtering that can be used( Fischer and Mullen, 2001). My question is how to implement that in my .usr file. Is there a routine?

Thanks,
Saikat


Saikat Mukherjee,
PhD Student,
Paul Research Group - http://www.me.vt.edu/mpaul/
Engineering Science and Mechanics,
Virginia Tech.
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