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Search took 0.00 seconds. Search: Posts Made By: FMDenaro
Forum: Main CFD Forum June 3, 2017, 13:37
Replies: 21
Views: 1,871
Posted By FMDenaro
That would be a long list, when I worked on this...

That would be a long list, when I worked on this topic I organized the references in this paper...
Forum: Main CFD Forum June 3, 2017, 04:11
Replies: 21
Views: 1,871
Posted By FMDenaro
Ok, however the issue is not simple and requires...

Ok, however the issue is not simple and requires some care. I suggest to read other references about the topic of (exact/approximate) projection methods.
Forum: Main CFD Forum June 2, 2017, 18:16
Replies: 21
Views: 1,871
Posted By FMDenaro
Prescribing homogeneous or non homogeneous...

Prescribing homogeneous or non homogeneous Neumann bc for the pressure equation is largely discussed in literature. It has difference in terms of accuracy, you can see that dp/dn=0 is a buondary...
Forum: Main CFD Forum June 2, 2017, 17:20
Replies: 21
Views: 1,871
Posted By FMDenaro
I don't see mathematical difference in that......

I don't see mathematical difference in that... Sec.4 in the Bridson notes explains nothing else that a projection method based on the Hodge decomposition.
Forum: Main CFD Forum June 2, 2017, 16:37
Replies: 21
Views: 1,871
Posted By FMDenaro
The Neumann BC is derived from the momentum...

The Neumann BC is derived from the momentum equation written in the form of the Hodge decomposition:

v_n+1 + Grad phi = v*

you have just to project along the vector unit n.
But if you do not...
Forum: Main CFD Forum June 2, 2017, 14:31
Replies: 21
Views: 1,871
Posted By FMDenaro
The pressure equation requires only one boundary...

The pressure equation requires only one boundary condition that is prescribed in term of the normal component of the velocity (by meanso of the Neumann condition) to fulfill the divergence-free...
Forum: Main CFD Forum June 2, 2017, 12:29
Replies: 21
Views: 1,871
Posted By FMDenaro
No, the Neumann condition implies only the normal...

No, the Neumann condition implies only the normal component of the velocity, that means physically permeable/not-permeable wall. The tangential condition is prescribed ONLY in the momentum equations.
Forum: Main CFD Forum June 2, 2017, 02:50
Replies: 21
Views: 1,871
Posted By FMDenaro
He describes the bc.s at the wall in terms of...

He describes the bc.s at the wall in terms of Neumann condition, see the section at page 27.
Forum: Main CFD Forum June 1, 2017, 22:27
Replies: 21
Views: 1,871
Posted By FMDenaro
As you see, a tangential bc is not involved in...

As you see, a tangential bc is not involved in the pressure equation...slip or no-slip bc is prescribed in the momentum.
For the pressure equation, to be well posed the problem, you prescribe:
...
Forum: Main CFD Forum June 1, 2017, 17:05
Replies: 21
Views: 1,871
Posted By FMDenaro
We recently discussed about BC.s for the pressure...

We recently discussed about BC.s for the pressure equation in this thread:
https://www.cfd-online.com/Forums/main/187563-pressure-boundary-conditions-collocated-grid-navier-stokes.html
Forum: Main CFD Forum June 1, 2017, 16:17
Replies: 21
Views: 1,871
Posted By FMDenaro
That's not correct...when you prescribe Neumann...

That's not correct...when you prescribe Neumann BC.s, some entries of the matrix are changed.
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