[Nek5000-users] RB convection with high Rayleigh numbers

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

Hi Mani,

A while back I was able to simulate 3D convection between stress-free surfaces at Rayleigh number Ra=1e6 (and Taylor number 5e5) with 4600 elements (and lx1=6) using time step 1e-5.

I remember that to get to Ra=1e6 I had to get lower Ra solution first and then use it as initial condition.

Best,
Aleks



----- Original Message -----
From: nek5000-users at lists.mcs.anl.gov
To: nek5000-users at lists.mcs.anl.gov
Sent: Saturday, May 15, 2010 12:09:31 AM GMT -06:00 US/Canada Central
Subject: [Nek5000-users] RB convection with high Rayleigh numbers

Hi,

     I'm trying to simulate RB convection in a 2D box of aspect ratio 
2:1. I'd like to simulate cases with Rayleigh numbers of the order of 
10^7 - 10^8. But I'm barely able to do 10^5 and that too with a time 
step of 10^-6. For the mesh I took 8 spectral elements in the x 
direction and 4 spectral elements in the y direction with 48 points 
within each of them. Is there any way one can reach higher Ra numbers?

Regards,
Mani chandra
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