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Forum: Main CFD Forum

July 8, 2021, 04:44

Replies: 21

Solving momentum Equation from known pressure field

Views: 1,333

Posted By sbaffini

OOOOOOOHHHHH.... Now I see what you all mean,...

OOOOOOOHHHHH.... Now I see what you all mean, you're talking about solving one steady state equation once to full convergence.

Ok, I think I agree in general terms, yet I'm not convinced that this...

Forum: Main CFD Forum

July 8, 2021, 04:29

Replies: 21

Solving momentum Equation from known pressure field

Views: 1,333

Posted By sbaffini

Even if the approach is based on: 1) A non...

Even if the approach is based on:

1) A non pressure-free method (where GRAD(p_n) is used in first advancing u_n to u*)?

2) A mass flux that, for a given velocity field, is mass preserving only...

Forum: Main CFD Forum

July 7, 2021, 12:29

Replies: 21

Solving momentum Equation from known pressure field

Views: 1,333

Posted By sbaffini

So, within machine precision? Or do you have any...

So, within machine precision? Or do you have any other quantification of the difference?

If it is so, than the dominance of the viscous effects might be the explanation. Together with the fact...

Forum: Main CFD Forum

July 7, 2021, 11:59

Replies: 21

Solving momentum Equation from known pressure field

Views: 1,333

Posted By sbaffini

Ok, I didn't get that from your first post. So,...

Ok, I didn't get that from your first post. So, if I now understand correctly, you are saying that using that pressure solution (hopefully a fully converged one to machine precision), there are cases...

Forum: Main CFD Forum

July 7, 2021, 09:49

Replies: 21

Solving momentum Equation from known pressure field

Views: 1,333

Posted By sbaffini

Note that your approach is indeed very legitimate...

Note that your approach is indeed very legitimate and sound (yet there might certainly be other difficulties in general). You use a pressure which is, indeed, the exact numerical solution for your...

Forum: Main CFD Forum

July 7, 2021, 07:37

Replies: 21

Solving momentum Equation from known pressure field

Views: 1,333

Posted By sbaffini

Pressure and velocity boundary conditions are...

Pressure and velocity boundary conditions are usually interlinked and you can't just skip one of them. Also, the continuity preserving mass flux in the momentum equations is based on the pressure. As...

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