Numerics

May 14, 2008, 06:18

Hi all,

I trying to mix a scalar in a turbulent flow field in order to estimate mixing times. Now I see a lot of diffusion, maybe too much. How can I distinguish numerical and real turbulent diffusion? I think I need to control the numerical scheme. Where can I do that? Which order is it anyway?

Cheers, Astrid

May 18, 2008, 19:20

Who's responding? No one?

In the past, I used CFX-4.2 at the university. Recently, I am saddled with EFD.Lab. Very fancy, but I would like to get more grip on what's behind. To convince at least the customer and my boss......

Astrid

May 30, 2008, 09:04

Hi Astrid,

The difference scheme used is described in section 3.2 of the fundamentals.pdf document, which you can find in the list when you launch EFD from Start/All Programs.

John.

May 14, 2008, 06:18	Numerics	#1
Astrid Guest Posts: n/a	Hi all, I trying to mix a scalar in a turbulent flow field in order to estimate mixing times. Now I see a lot of diffusion, maybe too much. How can I distinguish numerical and real turbulent diffusion? I think I need to control the numerical scheme. Where can I do that? Which order is it anyway? Cheers, Astrid

May 18, 2008, 19:20	Who's responding????????	#2
Astrid Guest Posts: n/a	Who's responding? No one? In the past, I used CFX-4.2 at the university. Recently, I am saddled with EFD.Lab. Very fancy, but I would like to get more grip on what's behind. To convince at least the customer and my boss...... Astrid

May 30, 2008, 09:04	Re: Who's responding????????	#3
John Parry Guest Posts: n/a	Hi Astrid, The difference scheme used is described in section 3.2 of the fundamentals.pdf document, which you can find in the list when you launch EFD from Start/All Programs. John.

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