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Search took 0.00 seconds. Search: Posts Made By: ghorrocks
Forum: CFX July 21, 2012, 05:59
Replies: 15
Views: 2,104
Posted By ghorrocks
Often LES is highy sensitive to the inlet...

Often LES is highy sensitive to the inlet conditions. I note you have just used a simple inlet velocity - in LES you often need to put a turbulence field on top of that, at least the turbulence...
Forum: CFX July 20, 2012, 18:07
Replies: 15
Views: 2,104
Posted By ghorrocks
Can you post just the CCL?

Can you post just the CCL?
Forum: CFX July 19, 2012, 19:07
Replies: 15
Views: 2,104
Posted By ghorrocks
There is possibly something wrong with you setup....

There is possibly something wrong with you setup. It is also possible that the solver senses that CDS is going to be harder to solve and grabs extra memory. Could be either. If you have enough memory...
Forum: CFX July 19, 2012, 08:02
Replies: 15
Views: 2,104
Posted By ghorrocks
It is unusual for the advection scheme or time...

It is unusual for the advection scheme or time step size to change the memory requirement. Something must be a bit unusual in your simulation to make this occur.
Forum: CFX July 19, 2012, 07:47
Replies: 15
Views: 2,104
Posted By ghorrocks
LES simulations require big meshes and massive...

LES simulations require big meshes and massive memory. That is unavoidable in this type of simulation.

Or are you saying CDS uses more memory than UDS? How much more?
Forum: CFX July 17, 2012, 19:27
Replies: 15
Views: 2,104
Posted By ghorrocks
Upwinding has lots of dissipation. Way too much....

Upwinding has lots of dissipation. Way too much. Your results will be very inaccurate.
Forum: CFX July 16, 2012, 22:53
Replies: 15
Views: 2,104
Posted By ghorrocks
Traditional LES requires low dissipation in the...

Traditional LES requires low dissipation in the numerics so the dissipation can be controlled in the sub grid model. If you use an advection scheme with upwinding it will put additional dissipation...
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