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-   -   Can a non-staggered grid Method used here? (http://www.cfd-online.com/Forums/main/4819-can-non-staggered-grid-method-used-here.html)

lololo June 11, 2002 07:20

Can a non-staggered grid Method used here?
 
Dear sir: I took pseudo-compressibility idea to process the continuity equation, Can I also used the non-staggered grid Method(By: Rhie C M ,Chow W L, 1983) now?


versi June 12, 2002 04:49

Re: Can a non-staggered grid Method used here?
 
The pseudo-compressibility method is mostly implemented on non-staggered grid because the P and V are coupled ,the method is free of compatability constraint which is encountered in other Poisson type methods, and is flexiable in complex geometries.

lololo June 12, 2002 07:16

Re: Can a non-staggered grid Method used here?
 
Sir: Thank you for your kind answers.

Do you mean that we can use collocated arrangement for Vi and P taking no account for the oscillating pressure field which occur in SIMPLE Method?

and, can I use the central diffence scheme for discretisation of the Pressue gradient item in this case?

versi June 12, 2002 21:00

Re: Can a non-staggered grid Method used here?
 
Since you use artificial compresssiblity method, it is of hyperbolic type, and upwind scheme is preferable for all inviscid terms. A central scheme will lead to instability on collocated grid.

Jim Park June 13, 2002 16:47

Re: Can a non-staggered grid Method used here?
 
You need to be sure that you mean "collocated" and not "colocated."

Colocated means that the velocities and pressure are evaluated at the same point (as opposed to a "staggered" location scheme).

Collocated is a mathematical term - I think (and will be corrected!) that it has to do with interpolation or as method to solve ODE's.

From the context of your posts, you are probably talking about "colocated."


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