[Nek5000-users] Helmholtz error

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

Hi David,

The disadvatage of setting p94 to zero is that there is no accelerated 
convergence in pressure solver due to projection to the solution space.

Setting DT>0 will results in an attempt to adjust DT to keep CFL constant 
set by p25 (COURANT)

Another way of setting an iteration tolerence in pressure solver is 
explicitly to p21 (DIVERGENCE).

Best,
Aleks


On Tue, 29 Jun 2010, David Goluskin wrote:

> Thanks, Paul.  That fixed it.  Is there any disadvantage to having param 94
> set to zero rather than 5?  Also, what does setting DT > 0 do?  I have
> indeed set DIVERGENCE to zero, as you told me this makes tolrel and tolabs
> take over.  What happens when DIVERGENCE is nonzero?
>
> Thanks,
>
> David
>