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Forum: OpenFOAM Running, Solving & CFD June 8, 2005, 14:37
Replies: 30
Views: 10,080
Posted By henry
The subject of segregated vs p

The subject of segregated vs point-coupled vs block-coupled compressible solvers has already been discussed on this site, you might find it useful to search for and read those threads.
Forum: OpenFOAM Running, Solving & CFD April 28, 2005, 18:31
Replies: 30
Views: 10,080
Posted By henry
There are no convergence probl

There are no convergence problems with the compressible codes in OpenFOAM, the equations are what they are, the pressure equation is implemented implicitly and it doesn't matter what the name of this...
Forum: OpenFOAM Running, Solving & CFD April 28, 2005, 17:35
Replies: 30
Views: 10,080
Posted By henry
> could the equation still be

> could the equation still be called a poisson ?

No it isn't a Poisson's equation with the implicit "convection" term but it might be called one if that part is explicit as it is in our new...
Forum: OpenFOAM Running, Solving & CFD April 28, 2005, 17:13
Replies: 30
Views: 10,080
Posted By henry
> why is that the convergence

> why is that the convergence problem be easily handled with elliptic systems ?

This is well known and explained in books on the subject.

The pressure equation may take several forms...
Forum: OpenFOAM Running, Solving & CFD April 28, 2005, 16:46
Replies: 30
Views: 10,080
Posted By henry
Eliptic pressure equation base

Eliptic pressure equation based compressible flow solvers do not suffer from problems handling low speed regions like density based solvers which is why we choose them. We are able to solve...
Forum: OpenFOAM Running, Solving & CFD April 28, 2005, 16:17
Replies: 30
Views: 10,080
Posted By henry
> Is the pressure correction e

> Is the pressure correction equation derived from combination of continuity and momentum equation ?

Yes in the same manner as for incompressible PISO. I guess it would be called compressible...
Forum: OpenFOAM Running, Solving & CFD April 28, 2005, 15:56
Replies: 30
Views: 10,080
Posted By henry
For steady-state flows all tim

For steady-state flows all time derivatives will vanish but not for transient flows. If you are solving steady-state flows you might be better of using one of the steady-state solvers.
Forum: OpenFOAM Running, Solving & CFD April 28, 2005, 15:43
Replies: 30
Views: 10,080
Posted By henry
Certainly not, it's real compr

Certainly not, it's real compressibility, there is nothing artificial about the compressibility in the compressible codes in OpenFOAM.
Forum: OpenFOAM Running, Solving & CFD April 28, 2005, 15:39
Replies: 30
Views: 10,080
Posted By henry
> why the need for pressre tim

> why the need for pressre time derivative

Because in compressible flow there is a rate of change of density and hence pressure, or vice versa depending on how you look at it.
Showing results 1 to 9 of 9

 
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