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Forum: Main CFD Forum January 14, 2024, 13:42
Replies: 10
Views: 338
Posted By FMDenaro
In the incompressible flow model, the pressure...

In the incompressible flow model, the pressure acts istantaneously, in a single time step the flow must cover the whole domain! You see easily that (single phase) Div v = 0 implies Int[S] n.v dS =0....
Forum: Main CFD Forum January 14, 2024, 07:31
Replies: 10
Views: 338
Posted By FMDenaro
First of all, if you have a fluid entering in...

First of all, if you have a fluid entering in some space (filled by air for example), you have to treat that adequately as fluid-air problem, that with two fluids. There is a plenty of literature...
Forum: Main CFD Forum January 13, 2024, 11:43
Replies: 10
Views: 338
Posted By FMDenaro
I am not sure to understand, you have to explain...

I am not sure to understand, you have to explain more details about your flow problem.
Forum: Main CFD Forum January 12, 2024, 13:30
Replies: 10
Views: 338
Posted By FMDenaro
You have to work in the Eulerian formulation, not...

You have to work in the Eulerian formulation, not the Lagrangian one.
Solve at each time step the same continuitą and momentum equations in all cells, nothing else.
Forum: Main CFD Forum January 12, 2024, 12:59
Replies: 10
Views: 338
Posted By FMDenaro
The gravity term acts in the vertical component...

The gravity term acts in the vertical component of the momentum equation, that is only in the fluid cells. It is computed in the prediction velocity of the projection method.
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